From ee188a1d5aab7c1622684363c6ec0c2785733dfc Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?L=C3=A9o=20Lam?= <leo@innovatetechnologi.es>
Date: Sun, 13 Nov 2016 14:23:09 +0100
Subject: [PATCH] IOS: Implement OH0 (/dev/usb/oh0)

---
 Source/Core/Core/CMakeLists.txt            |   2 +
 Source/Core/Core/Core.vcxproj              |   4 +
 Source/Core/Core/Core.vcxproj.filters      |  12 +
 Source/Core/Core/IOS/Device.cpp            |  10 +
 Source/Core/Core/IOS/Device.h              |   3 +
 Source/Core/Core/IOS/IPC.cpp               |  11 +
 Source/Core/Core/IOS/USB/OH0/OH0.cpp       | 356 +++++++++++++++++++++
 Source/Core/Core/IOS/USB/OH0/OH0.h         |  88 +++++
 Source/Core/Core/IOS/USB/OH0/OH0Device.cpp |  87 +++++
 Source/Core/Core/IOS/USB/OH0/OH0Device.h   |  41 +++
 Source/Core/Core/IOS/USB/USBV0.cpp         |  11 +
 Source/Core/Core/IOS/USB/USBV0.h           |  22 +-
 Source/Core/Core/State.cpp                 |   2 +-
 13 files changed, 646 insertions(+), 3 deletions(-)
 create mode 100644 Source/Core/Core/IOS/USB/OH0/OH0.cpp
 create mode 100644 Source/Core/Core/IOS/USB/OH0/OH0.h
 create mode 100644 Source/Core/Core/IOS/USB/OH0/OH0Device.cpp
 create mode 100644 Source/Core/Core/IOS/USB/OH0/OH0Device.h

diff --git a/Source/Core/Core/CMakeLists.txt b/Source/Core/Core/CMakeLists.txt
index 5d95be79fc..44bae6b2c6 100644
--- a/Source/Core/Core/CMakeLists.txt
+++ b/Source/Core/Core/CMakeLists.txt
@@ -155,6 +155,8 @@ set(SRCS	ActionReplay.cpp
 			IOS/STM/STM.cpp
 			IOS/USB/Common.cpp
 			IOS/USB/Host.cpp
+			IOS/USB/OH0/OH0.cpp
+			IOS/USB/OH0/OH0Device.cpp
 			IOS/USB/USBV0.cpp
 			IOS/USB/USB_KBD.cpp
 			IOS/USB/USB_VEN.cpp
diff --git a/Source/Core/Core/Core.vcxproj b/Source/Core/Core/Core.vcxproj
index 4cb3db2b4d..912c038179 100644
--- a/Source/Core/Core/Core.vcxproj
+++ b/Source/Core/Core/Core.vcxproj
@@ -192,6 +192,8 @@
     <ClCompile Include="IOS\USB\Host.cpp">
       <DisableSpecificWarnings>4200;%(DisableSpecificWarnings)</DisableSpecificWarnings>
     </ClCompile>
+    <ClCompile Include="IOS\USB\OH0\OH0.cpp" />
+    <ClCompile Include="IOS\USB\OH0\OH0Device.cpp" />
     <ClCompile Include="IOS\USB\USBV0.cpp" />
     <ClCompile Include="IOS\USB\USB_HIDv4.cpp">
       <!--
@@ -427,6 +429,8 @@
     <ClInclude Include="IOS\USB\Common.h" />
     <ClInclude Include="IOS\USB\LibusbDevice.h" />
     <ClInclude Include="IOS\USB\Host.h" />
+    <ClInclude Include="IOS\USB\OH0\OH0.h" />
+    <ClInclude Include="IOS\USB\OH0\OH0Device.h" />
     <ClInclude Include="IOS\USB\USBV0.h" />
     <ClInclude Include="IOS\USB\USB_HIDv4.h" />
     <ClInclude Include="IOS\USB\USB_KBD.h" />
diff --git a/Source/Core/Core/Core.vcxproj.filters b/Source/Core/Core/Core.vcxproj.filters
index 79cab51986..0c7ba536db 100644
--- a/Source/Core/Core/Core.vcxproj.filters
+++ b/Source/Core/Core/Core.vcxproj.filters
@@ -779,6 +779,12 @@
     <ClCompile Include="IOS\USB\Host.cpp">
       <Filter>IOS\USB</Filter>
     </ClCompile>
+    <ClCompile Include="IOS\USB\OH0\OH0.cpp">
+      <Filter>IOS\USB</Filter>
+    </ClCompile>
+    <ClCompile Include="IOS\USB\OH0\OH0Device.cpp">
+      <Filter>IOS\USB</Filter>
+    </ClCompile>
     <ClCompile Include="IOS\USB\USBV0.cpp">
       <Filter>IOS\USB</Filter>
     </ClCompile>
@@ -1365,6 +1371,12 @@
     <ClInclude Include="IOS\USB\Host.h">
       <Filter>IOS\USB</Filter>
     </ClInclude>
+    <ClInclude Include="IOS\USB\OH0\OH0.h">
+      <Filter>IOS\USB</Filter>
+    </ClInclude>
+    <ClInclude Include="IOS\USB\OH0\OH0Device.h">
+      <Filter>IOS\USB</Filter>
+    </ClInclude>
     <ClInclude Include="IOS\USB\USBV0.h">
       <Filter>IOS\USB</Filter>
     </ClInclude>
diff --git a/Source/Core/Core/IOS/Device.cpp b/Source/Core/Core/IOS/Device.cpp
index dd5de8071f..cf01110caa 100644
--- a/Source/Core/Core/IOS/Device.cpp
+++ b/Source/Core/Core/IOS/Device.cpp
@@ -76,6 +76,16 @@ bool IOCtlVRequest::HasInputVectorWithAddress(const u32 vector_address) const
                      [&](const auto& in_vector) { return in_vector.address == vector_address; });
 }
 
+bool IOCtlVRequest::HasNumberOfValidVectors(const size_t in_count, const size_t io_count) const
+{
+  if (in_vectors.size() != in_count || io_vectors.size() != io_count)
+    return false;
+
+  auto IsValidVector = [](const auto& vector) { return vector.size == 0 || vector.address != 0; };
+  return std::all_of(in_vectors.begin(), in_vectors.end(), IsValidVector) &&
+         std::all_of(io_vectors.begin(), io_vectors.end(), IsValidVector);
+}
+
 void IOCtlRequest::Log(const std::string& device_name, LogTypes::LOG_TYPE type,
                        LogTypes::LOG_LEVELS verbosity) const
 {
diff --git a/Source/Core/Core/IOS/Device.h b/Source/Core/Core/IOS/Device.h
index 48ba68b10d..c66665ddae 100644
--- a/Source/Core/Core/IOS/Device.h
+++ b/Source/Core/Core/IOS/Device.h
@@ -42,6 +42,7 @@ enum ReturnCode : s32
   FS_EDIRDEPTH = -116,       // Max directory depth exceeded
   FS_EBUSY = -118,           // Resource busy
   IPC_EESEXHAUSTED = -1016,  // Max of 2 ES handles exceeded
+  USB_ECANCELED = -7022,     // USB OH0 insertion hook cancelled
 };
 
 struct Request
@@ -122,6 +123,7 @@ struct IOCtlVRequest final : Request
   std::vector<IOVector> io_vectors;
   explicit IOCtlVRequest(u32 address);
   bool HasInputVectorWithAddress(u32 vector_address) const;
+  bool HasNumberOfValidVectors(size_t in_count, size_t io_count) const;
   void Dump(const std::string& description, LogTypes::LOG_TYPE type = LogTypes::IOS,
             LogTypes::LOG_LEVELS level = LogTypes::LINFO) const;
   void DumpUnknown(const std::string& description, LogTypes::LOG_TYPE type = LogTypes::IOS,
@@ -137,6 +139,7 @@ public:
   {
     Static,  // Devices which appear in s_device_map.
     FileIO,  // FileIO devices which are created dynamically.
+    OH0,     // OH0 child devices which are created dynamically.
   };
 
   Device(u32 device_id, const std::string& device_name, DeviceType type = DeviceType::Static);
diff --git a/Source/Core/Core/IOS/IPC.cpp b/Source/Core/Core/IOS/IPC.cpp
index 6655b5f6da..16443efa7e 100644
--- a/Source/Core/Core/IOS/IPC.cpp
+++ b/Source/Core/Core/IOS/IPC.cpp
@@ -49,6 +49,8 @@
 #include "Core/IOS/STM/STM.h"
 #include "Core/IOS/USB/Bluetooth/BTEmu.h"
 #include "Core/IOS/USB/Bluetooth/BTReal.h"
+#include "Core/IOS/USB/OH0/OH0.h"
+#include "Core/IOS/USB/OH0/OH0Device.h"
 #include "Core/IOS/USB/USB_KBD.h"
 #include "Core/IOS/USB/USB_VEN.h"
 #include "Core/IOS/WFS/WFSI.h"
@@ -516,6 +518,7 @@ void Reinit()
 #else
   AddDevice<Device::Stub>("/dev/usb/hid");
 #endif
+  AddDevice<Device::OH0>("/dev/usb/oh0");
   AddDevice<Device::Stub>("/dev/usb/oh1");
   AddDevice<Device::WFSSRV>("/dev/usb/wfssrv");
   AddDevice<Device::WFSI>("/dev/wfsi");
@@ -657,6 +660,10 @@ void DoState(PointerWrap& p)
           s_fdmap[i] = std::make_shared<Device::FileIO>(i, "");
           s_fdmap[i]->DoState(p);
           break;
+        case Device::Device::DeviceType::OH0:
+          s_fdmap[i] = std::make_shared<Device::OH0Device>(i, "");
+          s_fdmap[i]->DoState(p);
+          break;
         }
       }
     }
@@ -723,6 +730,10 @@ static s32 OpenDevice(const OpenRequest& request)
     if (!device)
       return IPC_EESEXHAUSTED;
   }
+  else if (request.path.find("/dev/usb/oh0/") == 0 && !GetDeviceByName(request.path))
+  {
+    device = std::make_shared<Device::OH0Device>(new_fd, request.path);
+  }
   else if (request.path.find("/dev/") == 0)
   {
     device = GetDeviceByName(request.path);
diff --git a/Source/Core/Core/IOS/USB/OH0/OH0.cpp b/Source/Core/Core/IOS/USB/OH0/OH0.cpp
new file mode 100644
index 0000000000..08461f9f99
--- /dev/null
+++ b/Source/Core/Core/IOS/USB/OH0/OH0.cpp
@@ -0,0 +1,356 @@
+// Copyright 2017 Dolphin Emulator Project
+// Licensed under GPLv2+
+// Refer to the license.txt file included.
+
+#include <algorithm>
+#include <cstring>
+#include <istream>
+#include <sstream>
+#include <tuple>
+#include <utility>
+
+#include "Common/Assert.h"
+#include "Common/ChunkFile.h"
+#include "Common/CommonFuncs.h"
+#include "Common/Logging/Log.h"
+#include "Core/Core.h"
+#include "Core/CoreTiming.h"
+#include "Core/HW/Memmap.h"
+#include "Core/IOS/USB/Common.h"
+#include "Core/IOS/USB/OH0/OH0.h"
+#include "Core/IOS/USB/USBV0.h"
+
+namespace IOS
+{
+namespace HLE
+{
+namespace Device
+{
+OH0::OH0(u32 device_id, const std::string& device_name) : USBHost(device_id, device_name)
+{
+}
+
+OH0::~OH0()
+{
+  StopThreads();
+}
+
+ReturnCode OH0::Open(const OpenRequest& request)
+{
+  const u32 ios_major_version = GetVersion();
+  if (ios_major_version == 57 || ios_major_version == 58 || ios_major_version == 59)
+    return IPC_EACCES;
+  return USBHost::Open(request);
+}
+
+IPCCommandResult OH0::IOCtl(const IOCtlRequest& request)
+{
+  request.Log(GetDeviceName(), LogTypes::IOS_USB);
+  switch (request.request)
+  {
+  case USB::IOCTL_USBV0_GETRHDESCA:
+    return GetRhDesca(request);
+  case USB::IOCTL_USBV0_CANCEL_INSERT_HOOK:
+    return CancelInsertionHook(request);
+  default:
+    return GetDefaultReply(IPC_EINVAL);
+  }
+}
+
+IPCCommandResult OH0::IOCtlV(const IOCtlVRequest& request)
+{
+  INFO_LOG(IOS_USB, "/dev/usb/oh0 - IOCtlV %u", request.request);
+  switch (request.request)
+  {
+  case USB::IOCTLV_USBV0_GETDEVLIST:
+    return GetDeviceList(request);
+  case USB::IOCTLV_USBV0_GETRHPORTSTATUS:
+    return GetRhPortStatus(request);
+  case USB::IOCTLV_USBV0_SETRHPORTSTATUS:
+    return SetRhPortStatus(request);
+  case USB::IOCTLV_USBV0_DEVINSERTHOOK:
+    return RegisterInsertionHook(request);
+  case USB::IOCTLV_USBV0_DEVICECLASSCHANGE:
+    return RegisterClassChangeHook(request);
+  case USB::IOCTLV_USBV0_DEVINSERTHOOKID:
+    return RegisterInsertionHookWithID(request);
+  default:
+    return GetDefaultReply(IPC_EINVAL);
+  }
+}
+
+void OH0::DoState(PointerWrap& p)
+{
+  if (p.GetMode() == PointerWrap::MODE_READ)
+  {
+    Core::DisplayMessage("It is suggested that you unplug and replug all connected USB devices.",
+                         5000);
+    Core::DisplayMessage("If USB doesn't work properly, an emulation reset may be needed.", 5000);
+  }
+  p.Do(m_insertion_hooks);
+  p.Do(m_removal_hooks);
+  p.Do(m_opened_devices);
+  USBHost::DoState(p);
+}
+
+IPCCommandResult OH0::CancelInsertionHook(const IOCtlRequest& request)
+{
+  if (!request.buffer_in || request.buffer_in_size != 4)
+    return GetDefaultReply(IPC_EINVAL);
+
+  // IOS assigns random IDs, but ours are simply the VID + PID (see RegisterInsertionHookWithID)
+  TriggerHook(m_insertion_hooks,
+              {Memory::Read_U16(request.buffer_in), Memory::Read_U16(request.buffer_in + 2)},
+              USB_ECANCELED);
+  return GetDefaultReply(IPC_SUCCESS);
+}
+
+IPCCommandResult OH0::GetDeviceList(const IOCtlVRequest& request) const
+{
+  if (!request.HasNumberOfValidVectors(2, 2))
+    return GetDefaultReply(IPC_EINVAL);
+
+  const u8 max_entries_count = Memory::Read_U8(request.in_vectors[0].address);
+  if (request.io_vectors[1].size != max_entries_count * sizeof(DeviceEntry))
+    return GetDefaultReply(IPC_EINVAL);
+
+  const u8 interface_class = Memory::Read_U8(request.in_vectors[1].address);
+  u8 entries_count = 0;
+  std::lock_guard<std::mutex> lk(m_devices_mutex);
+  for (const auto& device : m_devices)
+  {
+    if (entries_count >= max_entries_count)
+      break;
+    if (!device.second->HasClass(interface_class))
+      continue;
+
+    DeviceEntry entry;
+    entry.unknown = 0;
+    entry.vid = Common::swap16(device.second->GetVid());
+    entry.pid = Common::swap16(device.second->GetPid());
+    Memory::CopyToEmu(request.io_vectors[1].address + 8 * entries_count++, &entry, 8);
+  }
+  Memory::Write_U8(entries_count, request.io_vectors[0].address);
+  return GetDefaultReply(IPC_SUCCESS);
+}
+
+IPCCommandResult OH0::GetRhDesca(const IOCtlRequest& request) const
+{
+  if (!request.buffer_out || request.buffer_out_size != 4)
+    return GetDefaultReply(IPC_EINVAL);
+
+  // Based on a hardware test, this ioctl seems to return a constant value
+  Memory::Write_U32(0x02000302, request.buffer_out);
+  request.Dump(GetDeviceName(), LogTypes::IOS_USB, LogTypes::LWARNING);
+  return GetDefaultReply(IPC_SUCCESS);
+}
+
+IPCCommandResult OH0::GetRhPortStatus(const IOCtlVRequest& request) const
+{
+  if (!request.HasNumberOfValidVectors(1, 1))
+    return GetDefaultReply(IPC_EINVAL);
+
+  ERROR_LOG(IOS_USB, "Unimplemented IOCtlV: IOCTLV_USBV0_GETRHPORTSTATUS");
+  request.Dump(GetDeviceName(), LogTypes::IOS_USB, LogTypes::LERROR);
+  return GetDefaultReply(IPC_SUCCESS);
+}
+
+IPCCommandResult OH0::SetRhPortStatus(const IOCtlVRequest& request)
+{
+  if (!request.HasNumberOfValidVectors(2, 0))
+    return GetDefaultReply(IPC_EINVAL);
+
+  ERROR_LOG(IOS_USB, "Unimplemented IOCtlV: IOCTLV_USBV0_SETRHPORTSTATUS");
+  request.Dump(GetDeviceName(), LogTypes::IOS_USB, LogTypes::LERROR);
+  return GetDefaultReply(IPC_SUCCESS);
+}
+
+IPCCommandResult OH0::RegisterRemovalHook(const u64 device_id, const IOCtlRequest& request)
+{
+  std::lock_guard<std::mutex> lock{m_hooks_mutex};
+  // IOS only allows a single device removal hook.
+  if (m_removal_hooks.find(device_id) != m_removal_hooks.end())
+    return GetDefaultReply(IPC_EEXIST);
+  m_removal_hooks.insert({device_id, request.address});
+  return GetNoReply();
+}
+
+IPCCommandResult OH0::RegisterInsertionHook(const IOCtlVRequest& request)
+{
+  if (!request.HasNumberOfValidVectors(2, 0))
+    return GetDefaultReply(IPC_EINVAL);
+
+  const u16 vid = Memory::Read_U16(request.in_vectors[0].address);
+  const u16 pid = Memory::Read_U16(request.in_vectors[1].address);
+  if (HasDeviceWithVidPid(vid, pid))
+    return GetDefaultReply(IPC_SUCCESS);
+
+  std::lock_guard<std::mutex> lock{m_hooks_mutex};
+  // TODO: figure out whether IOS allows more than one hook.
+  m_insertion_hooks[{vid, pid}] = request.address;
+  return GetNoReply();
+}
+
+IPCCommandResult OH0::RegisterInsertionHookWithID(const IOCtlVRequest& request)
+{
+  if (!request.HasNumberOfValidVectors(3, 1))
+    return GetDefaultReply(IPC_EINVAL);
+
+  std::lock_guard<std::mutex> lock{m_hooks_mutex};
+  const u16 vid = Memory::Read_U16(request.in_vectors[0].address);
+  const u16 pid = Memory::Read_U16(request.in_vectors[1].address);
+  const bool trigger_only_for_new_device = Memory::Read_U8(request.in_vectors[2].address) == 1;
+  if (!trigger_only_for_new_device && HasDeviceWithVidPid(vid, pid))
+    return GetDefaultReply(IPC_SUCCESS);
+  // TODO: figure out whether IOS allows more than one hook.
+  m_insertion_hooks.insert({{vid, pid}, request.address});
+  // The output vector is overwritten with an ID to use with ioctl 31 for cancelling the hook.
+  Memory::Write_U32(vid << 16 | pid, request.io_vectors[0].address);
+  return GetNoReply();
+}
+
+IPCCommandResult OH0::RegisterClassChangeHook(const IOCtlVRequest& request)
+{
+  if (!request.HasNumberOfValidVectors(1, 0))
+    return GetDefaultReply(IPC_EINVAL);
+  WARN_LOG(IOS_USB, "Unimplemented IOCtlV: USB::IOCTLV_USBV0_DEVICECLASSCHANGE (no reply)");
+  request.Dump(GetDeviceName(), LogTypes::IOS_USB, LogTypes::LWARNING);
+  return GetNoReply();
+}
+
+bool OH0::HasDeviceWithVidPid(const u16 vid, const u16 pid) const
+{
+  return std::any_of(m_devices.begin(), m_devices.end(), [=](const auto& device) {
+    return device.second->GetVid() == vid && device.second->GetPid() == pid;
+  });
+}
+
+void OH0::OnDeviceChange(const ChangeEvent event, std::shared_ptr<USB::Device> device)
+{
+  std::lock_guard<std::mutex> lk(m_devices_mutex);
+  if (event == ChangeEvent::Inserted)
+    TriggerHook(m_insertion_hooks, {device->GetVid(), device->GetPid()}, IPC_SUCCESS);
+  else if (event == ChangeEvent::Removed)
+    TriggerHook(m_removal_hooks, device->GetId(), IPC_SUCCESS);
+}
+
+template <typename T>
+void OH0::TriggerHook(std::map<T, u32>& hooks, T value, const ReturnCode return_value)
+{
+  std::lock_guard<std::mutex> lk{m_hooks_mutex};
+  const auto hook = hooks.find(value);
+  if (hook == hooks.end())
+    return;
+  EnqueueReply(Request{hook->second}, return_value, 0, CoreTiming::FromThread::ANY);
+  hooks.erase(hook);
+}
+
+std::pair<ReturnCode, u64> OH0::DeviceOpen(const u16 vid, const u16 pid)
+{
+  std::lock_guard<std::mutex> lk(m_devices_mutex);
+
+  bool has_device_with_vid_pid = false;
+  for (const auto& device : m_devices)
+  {
+    if (device.second->GetVid() != vid || device.second->GetPid() != pid)
+      continue;
+    has_device_with_vid_pid = true;
+
+    if (m_opened_devices.find(device.second->GetId()) != m_opened_devices.cend() ||
+        !device.second->Attach(0))
+      continue;
+
+    m_opened_devices.emplace(device.second->GetId());
+    return {IPC_SUCCESS, device.second->GetId()};
+  }
+  // IOS doesn't allow opening the same device more than once (IPC_EEXIST)
+  return {has_device_with_vid_pid ? IPC_EEXIST : IPC_ENOENT, 0};
+}
+
+void OH0::DeviceClose(const u64 device_id)
+{
+  TriggerHook(m_removal_hooks, device_id, IPC_ENOENT);
+  m_opened_devices.erase(device_id);
+}
+
+IPCCommandResult OH0::DeviceIOCtl(const u64 device_id, const IOCtlRequest& request)
+{
+  const auto device = GetDeviceById(device_id);
+  if (!device)
+    return GetDefaultReply(IPC_ENOENT);
+
+  switch (request.request)
+  {
+  case USB::IOCTL_USBV0_DEVREMOVALHOOK:
+    return RegisterRemovalHook(device_id, request);
+  case USB::IOCTL_USBV0_SUSPENDDEV:
+  case USB::IOCTL_USBV0_RESUMEDEV:
+    // Unimplemented because libusb doesn't do power management.
+    return GetDefaultReply(IPC_SUCCESS);
+  case USB::IOCTL_USBV0_RESET_DEVICE:
+    TriggerHook(m_removal_hooks, device_id, IPC_SUCCESS);
+    return GetDefaultReply(IPC_SUCCESS);
+  default:
+    return GetDefaultReply(IPC_EINVAL);
+  }
+}
+
+IPCCommandResult OH0::DeviceIOCtlV(const u64 device_id, const IOCtlVRequest& request)
+{
+  const auto device = GetDeviceById(device_id);
+  if (!device)
+    return GetDefaultReply(IPC_ENOENT);
+
+  switch (request.request)
+  {
+  case USB::IOCTLV_USBV0_CTRLMSG:
+  case USB::IOCTLV_USBV0_BLKMSG:
+  case USB::IOCTLV_USBV0_LBLKMSG:
+  case USB::IOCTLV_USBV0_INTRMSG:
+  case USB::IOCTLV_USBV0_ISOMSG:
+    return HandleTransfer(device, request.request,
+                          [&, this]() { return SubmitTransfer(*device, request); });
+  case USB::IOCTLV_USBV0_UNKNOWN_32:
+    request.DumpUnknown(GetDeviceName(), LogTypes::IOS_USB);
+    return GetDefaultReply(IPC_SUCCESS);
+  default:
+    return GetDefaultReply(IPC_EINVAL);
+  }
+}
+
+s32 OH0::SubmitTransfer(USB::Device& device, const IOCtlVRequest& ioctlv)
+{
+  switch (ioctlv.request)
+  {
+  case USB::IOCTLV_USBV0_CTRLMSG:
+    if (!ioctlv.HasNumberOfValidVectors(6, 1) ||
+        Common::swap16(Memory::Read_U16(ioctlv.in_vectors[4].address)) != ioctlv.io_vectors[0].size)
+      return IPC_EINVAL;
+    return device.SubmitTransfer(std::make_unique<USB::V0CtrlMessage>(ioctlv));
+
+  case USB::IOCTLV_USBV0_BLKMSG:
+  case USB::IOCTLV_USBV0_LBLKMSG:
+    if (!ioctlv.HasNumberOfValidVectors(2, 1) ||
+        Memory::Read_U16(ioctlv.in_vectors[1].address) != ioctlv.io_vectors[0].size)
+      return IPC_EINVAL;
+    return device.SubmitTransfer(
+        std::make_unique<USB::V0BulkMessage>(ioctlv, ioctlv.request == USB::IOCTLV_USBV0_LBLKMSG));
+
+  case USB::IOCTLV_USBV0_INTRMSG:
+    if (!ioctlv.HasNumberOfValidVectors(2, 1) ||
+        Memory::Read_U16(ioctlv.in_vectors[1].address) != ioctlv.io_vectors[0].size)
+      return IPC_EINVAL;
+    return device.SubmitTransfer(std::make_unique<USB::V0IntrMessage>(ioctlv));
+
+  case USB::IOCTLV_USBV0_ISOMSG:
+    if (!ioctlv.HasNumberOfValidVectors(3, 2))
+      return IPC_EINVAL;
+    return device.SubmitTransfer(std::make_unique<USB::V0IsoMessage>(ioctlv));
+
+  default:
+    return IPC_EINVAL;
+  }
+}
+}  // namespace Device
+}  // namespace HLE
+}  // namespace IOS
diff --git a/Source/Core/Core/IOS/USB/OH0/OH0.h b/Source/Core/Core/IOS/USB/OH0/OH0.h
new file mode 100644
index 0000000000..df732a8c09
--- /dev/null
+++ b/Source/Core/Core/IOS/USB/OH0/OH0.h
@@ -0,0 +1,88 @@
+// Copyright 2017 Dolphin Emulator Project
+// Licensed under GPLv2+
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include <map>
+#include <memory>
+#include <mutex>
+#include <set>
+#include <string>
+#include <utility>
+#include <vector>
+
+#include "Common/CommonTypes.h"
+#include "Core/IOS/Device.h"
+#include "Core/IOS/USB/Host.h"
+
+class PointerWrap;
+
+namespace IOS
+{
+namespace HLE
+{
+namespace USB
+{
+struct DeviceInfo
+{
+  u16 vid;
+  u16 pid;
+  bool operator<(const DeviceInfo& other) const { return vid < other.vid; }
+};
+}  // namespace USB
+
+namespace Device
+{
+// /dev/usb/oh0
+class OH0 final : public USBHost
+{
+public:
+  OH0(u32 device_id, const std::string& device_name);
+  ~OH0() override;
+
+  ReturnCode Open(const OpenRequest& request) override;
+  IPCCommandResult IOCtl(const IOCtlRequest& request) override;
+  IPCCommandResult IOCtlV(const IOCtlVRequest& request) override;
+
+  std::pair<ReturnCode, u64> DeviceOpen(u16 vid, u16 pid);
+  void DeviceClose(u64 device_id);
+  IPCCommandResult DeviceIOCtl(u64 device_id, const IOCtlRequest& request);
+  IPCCommandResult DeviceIOCtlV(u64 device_id, const IOCtlVRequest& request);
+
+  void DoState(PointerWrap& p) override;
+
+private:
+  IPCCommandResult CancelInsertionHook(const IOCtlRequest& request);
+  IPCCommandResult GetDeviceList(const IOCtlVRequest& request) const;
+  IPCCommandResult GetRhDesca(const IOCtlRequest& request) const;
+  IPCCommandResult GetRhPortStatus(const IOCtlVRequest& request) const;
+  IPCCommandResult SetRhPortStatus(const IOCtlVRequest& request);
+  IPCCommandResult RegisterRemovalHook(u64 device_id, const IOCtlRequest& request);
+  IPCCommandResult RegisterInsertionHook(const IOCtlVRequest& request);
+  IPCCommandResult RegisterInsertionHookWithID(const IOCtlVRequest& request);
+  IPCCommandResult RegisterClassChangeHook(const IOCtlVRequest& request);
+  s32 SubmitTransfer(USB::Device& device, const IOCtlVRequest& request);
+
+  bool HasDeviceWithVidPid(u16 vid, u16 pid) const;
+  void OnDeviceChange(ChangeEvent event, std::shared_ptr<USB::Device> device) override;
+  template <typename T>
+  void TriggerHook(std::map<T, u32>& hooks, T value, ReturnCode return_value);
+
+  struct DeviceEntry
+  {
+    u32 unknown;
+    u16 vid;
+    u16 pid;
+  };
+  static_assert(sizeof(DeviceEntry) == 8, "sizeof(DeviceEntry) must be 8");
+
+  // Device info (VID, PID) → command address for pending hook requests
+  std::map<USB::DeviceInfo, u32> m_insertion_hooks;
+  std::map<u64, u32> m_removal_hooks;
+  std::set<u64> m_opened_devices;
+  std::mutex m_hooks_mutex;
+};
+}  // namespace Device
+}  // namespace HLE
+}  // namespace IOS
diff --git a/Source/Core/Core/IOS/USB/OH0/OH0Device.cpp b/Source/Core/Core/IOS/USB/OH0/OH0Device.cpp
new file mode 100644
index 0000000000..61bbd447db
--- /dev/null
+++ b/Source/Core/Core/IOS/USB/OH0/OH0Device.cpp
@@ -0,0 +1,87 @@
+// Copyright 2017 Dolphin Emulator Project
+// Licensed under GPLv2+
+// Refer to the license.txt file included.
+
+#include <sstream>
+#include <tuple>
+#include <vector>
+
+#include "Common/ChunkFile.h"
+#include "Core/IOS/IPC.h"
+#include "Core/IOS/USB/OH0/OH0.h"
+#include "Core/IOS/USB/OH0/OH0Device.h"
+
+namespace IOS
+{
+namespace HLE
+{
+namespace Device
+{
+static void GetVidPidFromDevicePath(const std::string& device_path, u16& vid, u16& pid)
+{
+  std::stringstream stream{device_path};
+  std::string segment;
+  std::vector<std::string> list;
+  while (std::getline(stream, segment, '/'))
+    if (!segment.empty())
+      list.push_back(segment);
+
+  if (list.size() != 5)
+    return;
+
+  std::stringstream ss;
+  ss << std::hex << list[3];
+  ss >> vid;
+  ss.clear();
+  ss << std::hex << list[4];
+  ss >> pid;
+}
+
+OH0Device::OH0Device(u32 id, const std::string& name) : Device(id, name, DeviceType::OH0)
+{
+  if (!name.empty())
+    GetVidPidFromDevicePath(name, m_vid, m_pid);
+}
+
+void OH0Device::DoState(PointerWrap& p)
+{
+  m_oh0 = std::static_pointer_cast<OH0>(GetDeviceByName("/dev/usb/oh0"));
+  p.Do(m_name);
+  p.Do(m_vid);
+  p.Do(m_pid);
+  p.Do(m_device_id);
+}
+
+ReturnCode OH0Device::Open(const OpenRequest& request)
+{
+  const u32 ios_major_version = GetVersion();
+  if (ios_major_version == 57 || ios_major_version == 58 || ios_major_version == 59)
+    return IPC_ENOENT;
+
+  if (m_vid == 0 && m_pid == 0)
+    return IPC_ENOENT;
+
+  m_oh0 = std::static_pointer_cast<OH0>(GetDeviceByName("/dev/usb/oh0"));
+
+  ReturnCode return_code;
+  std::tie(return_code, m_device_id) = m_oh0->DeviceOpen(m_vid, m_pid);
+  return return_code;
+}
+
+void OH0Device::Close()
+{
+  m_oh0->DeviceClose(m_device_id);
+}
+
+IPCCommandResult OH0Device::IOCtl(const IOCtlRequest& request)
+{
+  return m_oh0->DeviceIOCtl(m_device_id, request);
+}
+
+IPCCommandResult OH0Device::IOCtlV(const IOCtlVRequest& request)
+{
+  return m_oh0->DeviceIOCtlV(m_device_id, request);
+}
+}  // namespace Device
+}  // namespace HLE
+}  // namespace IOS
diff --git a/Source/Core/Core/IOS/USB/OH0/OH0Device.h b/Source/Core/Core/IOS/USB/OH0/OH0Device.h
new file mode 100644
index 0000000000..239622d227
--- /dev/null
+++ b/Source/Core/Core/IOS/USB/OH0/OH0Device.h
@@ -0,0 +1,41 @@
+// Copyright 2017 Dolphin Emulator Project
+// Licensed under GPLv2+
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include <memory>
+#include <string>
+
+#include "Common/CommonTypes.h"
+#include "Core/IOS/Device.h"
+
+class PointerWrap;
+
+namespace IOS
+{
+namespace HLE
+{
+namespace Device
+{
+class OH0;
+class OH0Device final : public Device
+{
+public:
+  OH0Device(u32 device_id, const std::string& device_name);
+
+  ReturnCode Open(const OpenRequest& request) override;
+  void Close() override;
+  IPCCommandResult IOCtl(const IOCtlRequest& request) override;
+  IPCCommandResult IOCtlV(const IOCtlVRequest& request) override;
+  void DoState(PointerWrap& p) override;
+
+private:
+  std::shared_ptr<OH0> m_oh0;
+  u16 m_vid = 0;
+  u16 m_pid = 0;
+  u64 m_device_id = 0;
+};
+}  // namespace Device
+}  // namespace HLE
+}  // namespace IOS
diff --git a/Source/Core/Core/IOS/USB/USBV0.cpp b/Source/Core/Core/IOS/USB/USBV0.cpp
index 13084aa438..fb844f0f09 100644
--- a/Source/Core/Core/IOS/USB/USBV0.cpp
+++ b/Source/Core/Core/IOS/USB/USBV0.cpp
@@ -42,6 +42,17 @@ V0IntrMessage::V0IntrMessage(const IOCtlVRequest& ioctlv)
   endpoint = Memory::Read_U8(ioctlv.in_vectors[0].address);
   length = Memory::Read_U16(ioctlv.in_vectors[1].address);
 }
+
+V0IsoMessage::V0IsoMessage(const IOCtlVRequest& ioctlv)
+    : IsoMessage(ioctlv, ioctlv.io_vectors[1].address)
+{
+  endpoint = Memory::Read_U8(ioctlv.in_vectors[0].address);
+  length = Memory::Read_U16(ioctlv.in_vectors[1].address);
+  num_packets = Memory::Read_U8(ioctlv.in_vectors[2].address);
+  packet_sizes_addr = ioctlv.io_vectors[0].address;
+  for (size_t i = 0; i < num_packets; ++i)
+    packet_sizes.push_back(Memory::Read_U16(static_cast<u32>(packet_sizes_addr + i * sizeof(u16))));
+}
 }  // namespace USB
 }  // namespace HLE
 }  // namespace IOS
diff --git a/Source/Core/Core/IOS/USB/USBV0.h b/Source/Core/Core/IOS/USB/USBV0.h
index 32efb8f25f..9af2c1308f 100644
--- a/Source/Core/Core/IOS/USB/USBV0.h
+++ b/Source/Core/Core/IOS/USB/USBV0.h
@@ -4,8 +4,6 @@
 
 #pragma once
 
-#include <cstddef>
-
 #include "Common/CommonTypes.h"
 #include "Core/IOS/USB/Common.h"
 
@@ -24,6 +22,21 @@ enum V0Requests
   IOCTLV_USBV0_CTRLMSG = 0,
   IOCTLV_USBV0_BLKMSG = 1,
   IOCTLV_USBV0_INTRMSG = 2,
+  IOCTL_USBV0_SUSPENDDEV = 5,
+  IOCTL_USBV0_RESUMEDEV = 6,
+  IOCTLV_USBV0_ISOMSG = 9,
+  IOCTLV_USBV0_LBLKMSG = 10,
+  IOCTLV_USBV0_GETDEVLIST = 12,
+  IOCTL_USBV0_GETRHDESCA = 15,
+  IOCTLV_USBV0_GETRHPORTSTATUS = 20,
+  IOCTLV_USBV0_SETRHPORTSTATUS = 25,
+  IOCTL_USBV0_DEVREMOVALHOOK = 26,
+  IOCTLV_USBV0_DEVINSERTHOOK = 27,
+  IOCTLV_USBV0_DEVICECLASSCHANGE = 28,
+  IOCTL_USBV0_RESET_DEVICE = 29,
+  IOCTLV_USBV0_DEVINSERTHOOKID = 30,
+  IOCTL_USBV0_CANCEL_INSERT_HOOK = 31,
+  IOCTLV_USBV0_UNKNOWN_32 = 32,
 };
 
 struct V0CtrlMessage final : CtrlMessage
@@ -40,6 +53,11 @@ struct V0IntrMessage final : IntrMessage
 {
   explicit V0IntrMessage(const IOCtlVRequest& ioctlv);
 };
+
+struct V0IsoMessage final : IsoMessage
+{
+  explicit V0IsoMessage(const IOCtlVRequest& ioctlv);
+};
 }  // namespace USB
 }  // namespace HLE
 }  // namespace IOS
diff --git a/Source/Core/Core/State.cpp b/Source/Core/Core/State.cpp
index e51b9386e7..9f1b96da03 100644
--- a/Source/Core/Core/State.cpp
+++ b/Source/Core/Core/State.cpp
@@ -71,7 +71,7 @@ static Common::Event g_compressAndDumpStateSyncEvent;
 static std::thread g_save_thread;
 
 // Don't forget to increase this after doing changes on the savestate system
-static const u32 STATE_VERSION = 73;  // Last changed in PR 4651
+static const u32 STATE_VERSION = 74;  // Last changed in PR 4408
 
 // Maps savestate versions to Dolphin versions.
 // Versions after 42 don't need to be added to this list,