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// Copyright 2015 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "device/usb/usb_service.h"
#include <map>
#include "base/memory/weak_ptr.h"
#include "base/single_thread_task_runner.h"
#include "device/usb/usb_context.h"
#include "device/usb/usb_device_impl.h"
#include "third_party/libusb/src/libusb/libusb.h"
namespace device {
typedef struct libusb_device* PlatformUsbDevice;
typedef struct libusb_context* PlatformUsbContext;
class UsbServiceImpl : public UsbService {
public:
static UsbService* Create(
scoped_refptr<base::SingleThreadTaskRunner> ui_task_runner);
private:
explicit UsbServiceImpl(
PlatformUsbContext context,
scoped_refptr<base::SingleThreadTaskRunner> ui_task_runner);
~UsbServiceImpl() override;
// device::UsbService implementation
scoped_refptr<UsbDevice> GetDeviceById(uint32 unique_id) override;
void GetDevices(std::vector<scoped_refptr<UsbDevice>>* devices) override;
// Enumerate USB devices from OS and update devices_ map.
void RefreshDevices();
#if defined(OS_WIN)
void RefreshDevicesIfWinUsbDevice(const std::string& device_path);
#endif // OS_WIN
// Adds a new UsbDevice to the devices_ map based on the given libusb device.
scoped_refptr<UsbDeviceImpl> AddDevice(PlatformUsbDevice platform_device);
// Handle hotplug events from libusb.
static int LIBUSB_CALL HotplugCallback(libusb_context* context,
PlatformUsbDevice device,
libusb_hotplug_event event,
void* user_data);
// These functions release a reference to the provided platform device.
void OnDeviceAdded(PlatformUsbDevice platform_device);
void OnDeviceRemoved(PlatformUsbDevice platform_device);
scoped_refptr<UsbContext> context_;
scoped_refptr<base::SingleThreadTaskRunner> task_runner_;
scoped_refptr<base::SingleThreadTaskRunner> ui_task_runner_;
#if defined(OS_WIN)
class UIThreadHelper;
UIThreadHelper* ui_thread_helper_;
#endif // OS_WIN
// TODO(reillyg): Figure out a better solution for device IDs.
uint32 next_unique_id_;
// When available the device list will be updated when new devices are
// connected instead of only when a full enumeration is requested.
// TODO(reillyg): Support this on all platforms. crbug.com/411715
bool hotplug_enabled_;
libusb_hotplug_callback_handle hotplug_handle_;
// The map from unique IDs to UsbDevices.
typedef std::map<uint32, scoped_refptr<UsbDeviceImpl>> DeviceMap;
DeviceMap devices_;
// The map from PlatformUsbDevices to UsbDevices.
typedef std::map<PlatformUsbDevice, scoped_refptr<UsbDeviceImpl>>
PlatformDeviceMap;
PlatformDeviceMap platform_devices_;
base::WeakPtrFactory<UsbServiceImpl> weak_factory_;
DISALLOW_COPY_AND_ASSIGN(UsbServiceImpl);
};
} // namespace device
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