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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 "usbgadget.h"
#include "configuration.h"
#include "libqdb/make_unique.h"
#include "libqdb/qdbconstants.h"
#include "usb-gadget/usbgadgetreader.h"
#include "usb-gadget/usbgadgetwriter.h"
#include <QtCore/qdatastream.h>
#include <QtCore/qdebug.h>
#include <QtCore/qthread.h>
#include <linux/usb/functionfs.h>
usb_interface_descriptor makeInterfaceDescriptor()
{
usb_interface_descriptor interface;
interface.bLength = sizeof(interface);
interface.bDescriptorType = USB_DT_INTERFACE;
interface.bInterfaceNumber = 0;
interface.bAlternateSetting = 0;
interface.bNumEndpoints = 2;
interface.bInterfaceClass = qdbUsbClassId;
interface.bInterfaceSubClass = qdbUsbSubclassId;
interface.bInterfaceProtocol = qdbUsbProtocolId;
interface.iInterface = 1;
return interface;
}
usb_endpoint_descriptor_no_audio makeEndpointDescriptor(uint8_t endpointAddress, uint16_t maxPacketSize)
{
usb_endpoint_descriptor_no_audio endpoint;
endpoint.bLength = sizeof(endpoint);
endpoint.bDescriptorType = USB_DT_ENDPOINT;
endpoint.bEndpointAddress = endpointAddress;
endpoint.bmAttributes = USB_ENDPOINT_XFER_BULK;
endpoint.wMaxPacketSize = htole16(maxPacketSize);
endpoint.bInterval = 0;
return endpoint;
}
const struct {
struct usb_functionfs_descs_head header;
struct {
struct usb_interface_descriptor intf;
struct usb_endpoint_descriptor_no_audio bulk_source;
struct usb_endpoint_descriptor_no_audio bulk_sink;
} __attribute__ ((__packed__)) fs_descs, hs_descs;
} __attribute__ ((__packed__)) descriptors = {
{
htole32(FUNCTIONFS_DESCRIPTORS_MAGIC),
htole32(sizeof(descriptors)), /* length */
htole32(3), /* full speed descriptor count */
htole32(3), /* high speed descriptor count */
},
{
makeInterfaceDescriptor(), /* full speed interface descriptor */
makeEndpointDescriptor(1 | USB_DIR_OUT, 64),
makeEndpointDescriptor(2 | USB_DIR_IN, 64),
},
{
makeInterfaceDescriptor(), /* high speed interface descriptor */
makeEndpointDescriptor(1 | USB_DIR_OUT, 512),
makeEndpointDescriptor(2 | USB_DIR_IN, 512),
},
};
#define STR_INTERFACE "QDB Interface"
const struct {
struct usb_functionfs_strings_head header;
struct {
__le16 code;
const char str1[sizeof(STR_INTERFACE)];
} __attribute__ ((__packed__)) lang0;
} __attribute__ ((__packed__)) strings = {
{
htole32(FUNCTIONFS_STRINGS_MAGIC),
htole32(sizeof(strings)),
htole32(1),
htole32(1),
},
{
htole16(0x0409), /* en-us */
STR_INTERFACE,
},
};
UsbGadget::UsbGadget()
: m_controlEndpoint(Configuration::functionFsDir() + "/ep0"),
m_outEndpoint(Configuration::functionFsDir() + "/ep1"),
m_inEndpoint(Configuration::functionFsDir() + "/ep2"),
m_readThread{nullptr},
m_writeThread{nullptr},
m_reader{nullptr},
m_writer{nullptr},
m_reads{}
{
}
UsbGadget::~UsbGadget()
{
if (m_readThread) {
m_readThread->terminate();
m_readThread->wait();
}
if (m_writeThread) {
m_writeThread->terminate();
m_readThread->wait();
}
m_inEndpoint.close();
m_outEndpoint.close();
m_controlEndpoint.close();
}
bool UsbGadget::open(QIODevice::OpenMode mode)
{
Q_ASSERT(mode == (QIODevice::ReadWrite | QIODevice::Unbuffered));
QIODevice::open(mode);
if (!openControlEndpoint())
return false;
qint64 bytes = m_controlEndpoint.write(reinterpret_cast<const char*>(&descriptors), sizeof(descriptors));
if (bytes == -1) {
qDebug() << "Failed to write USB descriptors:" << m_controlEndpoint.errorString();
return false;
}
bytes = m_controlEndpoint.write(reinterpret_cast<const char*>(&strings), sizeof(strings));
if (bytes == -1) {
qDebug() << "Failed to write USB strings:" << m_controlEndpoint.errorString();
return false;
}
if (!m_outEndpoint.open(QIODevice::ReadOnly | QIODevice::Unbuffered)) {
qDebug() << "Failed to open endpoint from host to gadget";
return false;
}
if (!m_inEndpoint.open(QIODevice::WriteOnly | QIODevice::Unbuffered)) {
qDebug() << "Failed to open endpoint from gadget to host";
return false;
}
qDebug() << "Initialized function fs";
startReadThread();
startWriteThread();
return true;
}
qint64 UsbGadget::readData(char *data, qint64 maxSize)
{
if (m_reads.isEmpty()) {
qDebug() << "UsbGadget read queue empty in readData";
return -1;
}
QByteArray read = m_reads.dequeue();
Q_ASSERT(read.size() <= maxSize); // TODO: handle too big reads
std::copy(read.begin(), read.end(), data);
return read.size();
}
qint64 UsbGadget::writeData(const char *data, qint64 size)
{
if (m_inEndpoint.isOpen()) {
emit writeAvailable(QByteArray{data, static_cast<int>(size)});
return size;
}
qDebug() << "Tried to send to host through closed endpoint";
return -1;
}
void UsbGadget::dataRead(QByteArray data)
{
m_reads.enqueue(data);
emit readyRead();
}
void UsbGadget::startReadThread()
{
m_reader = make_unique<UsbGadgetReader>(&m_outEndpoint);
m_readThread = make_unique<QThread>();
connect(m_reader.get(), &UsbGadgetReader::newRead, this, &UsbGadget::dataRead);
connect(m_readThread.get(), &QThread::started, m_reader.get(), &UsbGadgetReader::executeRead);
m_reader->moveToThread(m_readThread.get());
m_readThread->setObjectName("UsbGadgetReader");
m_readThread->start();
}
void UsbGadget::startWriteThread()
{
m_writer = make_unique<UsbGadgetWriter>(&m_inEndpoint);
m_writeThread = make_unique<QThread>();
connect(this, &UsbGadget::writeAvailable, m_writer.get(), &UsbGadgetWriter::write);
m_writer->moveToThread(m_writeThread.get());
m_writeThread->setObjectName("UsbGadgetWriter");
m_writeThread->start();
}
bool UsbGadget::openControlEndpoint()
{
if (!QFile::exists(m_controlEndpoint.fileName())) {
qCritical() << "USB ffs control endpoint" << m_controlEndpoint.fileName() << "does not exist";
return false;
}
if (!m_controlEndpoint.open(QIODevice::ReadWrite | QIODevice::Unbuffered)) {
qCritical() << "Failed to open control endpoint" << m_controlEndpoint.fileName();
return false;
}
return true;
}
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