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Host.cpp
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Host.cpp
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// Copyright 2017 Dolphin Emulator Project
// Licensed under GPLv2+
// Refer to the license.txt file included.
#include "Core/IOS/USB/Host.h"
#include <algorithm>
#include <memory>
#include <mutex>
#include <set>
#include <string>
#include <utility>
#ifdef __LIBUSB__
#include <libusb.h>
#endif
#include "Common/Assert.h"
#include "Common/ChunkFile.h"
#include "Common/CommonTypes.h"
#include "Common/Logging/Log.h"
#include "Common/Thread.h"
#include "Core/ConfigManager.h"
#include "Core/Core.h"
#include "Core/IOS/USB/Common.h"
#include "Core/IOS/USB/LibusbDevice.h"
namespace IOS::HLE::Device
{
USBHost::USBHost(Kernel& ios, const std::string& device_name) : Device(ios, device_name)
{
}
USBHost::~USBHost() = default;
IPCCommandResult USBHost::Open(const OpenRequest& request)
{
if (!m_has_initialised)
{
StartThreads();
// Force a device scan to complete, because some games (including Your Shape) only care
// about the initial device list (in the first GETDEVICECHANGE reply).
m_first_scan_complete_event.Wait();
m_has_initialised = true;
}
return GetDefaultReply(IPC_SUCCESS);
}
void USBHost::UpdateWantDeterminism(const bool new_want_determinism)
{
if (new_want_determinism)
StopThreads();
else if (IsOpened())
StartThreads();
}
void USBHost::DoState(PointerWrap& p)
{
if (IsOpened() && p.GetMode() == PointerWrap::MODE_READ)
{
// After a state has loaded, there may be insertion hooks for devices that were
// already plugged in, and which need to be triggered.
UpdateDevices(true);
}
}
bool USBHost::AddDevice(std::unique_ptr<USB::Device> device)
{
std::lock_guard<std::mutex> lk(m_devices_mutex);
if (m_devices.find(device->GetId()) != m_devices.end())
return false;
m_devices[device->GetId()] = std::move(device);
return true;
}
std::shared_ptr<USB::Device> USBHost::GetDeviceById(const u64 device_id) const
{
std::lock_guard<std::mutex> lk(m_devices_mutex);
const auto it = m_devices.find(device_id);
if (it == m_devices.end())
return nullptr;
return it->second;
}
void USBHost::OnDeviceChange(ChangeEvent event, std::shared_ptr<USB::Device> changed_device)
{
}
void USBHost::OnDeviceChangeEnd()
{
}
bool USBHost::ShouldAddDevice(const USB::Device& device) const
{
return true;
}
// This is called from the scan thread. Returns false if we failed to update the device list.
bool USBHost::UpdateDevices(const bool always_add_hooks)
{
if (Core::WantsDeterminism())
return true;
DeviceChangeHooks hooks;
std::set<u64> plugged_devices;
// If we failed to get a new, up-to-date list of devices, we cannot detect device removals.
if (!AddNewDevices(plugged_devices, hooks, always_add_hooks))
return false;
DetectRemovedDevices(plugged_devices, hooks);
DispatchHooks(hooks);
m_first_scan_complete_event.Set();
return true;
}
bool USBHost::AddNewDevices(std::set<u64>& new_devices, DeviceChangeHooks& hooks,
const bool always_add_hooks)
{
#ifdef __LIBUSB__
if (SConfig::GetInstance().m_usb_passthrough_devices.empty())
return true;
if (m_context.IsValid())
{
m_context.GetDeviceList([&](libusb_device* device) {
libusb_device_descriptor descriptor;
libusb_get_device_descriptor(device, &descriptor);
const std::pair<u16, u16> vid_pid = {descriptor.idVendor, descriptor.idProduct};
if (!SConfig::GetInstance().IsUSBDeviceWhitelisted(vid_pid))
return true;
auto usb_device = std::make_unique<USB::LibusbDevice>(m_ios, device, descriptor);
if (!ShouldAddDevice(*usb_device))
return true;
const u64 id = usb_device->GetId();
new_devices.insert(id);
if (AddDevice(std::move(usb_device)) || always_add_hooks)
hooks.emplace(GetDeviceById(id), ChangeEvent::Inserted);
return true;
});
}
#endif
return true;
}
void USBHost::DetectRemovedDevices(const std::set<u64>& plugged_devices, DeviceChangeHooks& hooks)
{
std::lock_guard<std::mutex> lk(m_devices_mutex);
for (auto it = m_devices.begin(); it != m_devices.end();)
{
if (plugged_devices.find(it->second->GetId()) == plugged_devices.end())
{
hooks.emplace(it->second, ChangeEvent::Removed);
it = m_devices.erase(it);
}
else
{
++it;
}
}
}
void USBHost::DispatchHooks(const DeviceChangeHooks& hooks)
{
for (const auto& hook : hooks)
{
INFO_LOG(IOS_USB, "%s - %s device: %04x:%04x", GetDeviceName().c_str(),
hook.second == ChangeEvent::Inserted ? "New" : "Removed", hook.first->GetVid(),
hook.first->GetPid());
OnDeviceChange(hook.second, hook.first);
}
if (!hooks.empty())
OnDeviceChangeEnd();
}
void USBHost::StartThreads()
{
if (Core::WantsDeterminism())
return;
if (!m_scan_thread_running.IsSet())
{
m_scan_thread_running.Set();
m_scan_thread = std::thread([this] {
Common::SetCurrentThreadName("USB Scan Thread");
while (m_scan_thread_running.IsSet())
{
UpdateDevices();
Common::SleepCurrentThread(50);
}
});
}
}
void USBHost::StopThreads()
{
if (m_scan_thread_running.TestAndClear())
m_scan_thread.join();
// Clear all devices and dispatch removal hooks.
DeviceChangeHooks hooks;
DetectRemovedDevices(std::set<u64>(), hooks);
DispatchHooks(hooks);
}
IPCCommandResult USBHost::HandleTransfer(std::shared_ptr<USB::Device> device, u32 request,
std::function<s32()> submit) const
{
if (!device)
return GetDefaultReply(IPC_ENOENT);
const s32 ret = submit();
if (ret == IPC_SUCCESS)
return GetNoReply();
ERROR_LOG(IOS_USB, "[%04x:%04x] Failed to submit transfer (request %u): %s", device->GetVid(),
device->GetPid(), request, device->GetErrorName(ret).c_str());
return GetDefaultReply(ret <= 0 ? ret : IPC_EINVAL);
}
} // namespace IOS::HLE::Device