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// Copyright 2016 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 <list>
#include <memory>
#include <unordered_map>
#include "base/macros.h"
#include "base/memory/weak_ptr.h"
#include "device/usb/usb_service.h"
namespace device {
struct UsbDeviceDescriptor;
class UsbDeviceLinux;
class UsbServiceLinux : public UsbService {
public:
UsbServiceLinux();
~UsbServiceLinux() override;
// device::UsbService implementation
void GetDevices(const GetDevicesCallback& callback) override;
private:
using DeviceMap =
std::unordered_map<std::string, scoped_refptr<UsbDeviceLinux>>;
class FileThreadHelper;
void OnDeviceAdded(const std::string& device_path,
const UsbDeviceDescriptor& descriptor,
const std::string& manufacturer,
const std::string& product,
const std::string& serial_number,
uint8_t active_configuration);
void DeviceReady(scoped_refptr<UsbDeviceLinux> device, bool success);
void OnDeviceRemoved(const std::string& device_path);
void HelperStarted();
bool enumeration_ready() {
return helper_started_ && first_enumeration_countdown_ == 0;
}
// |helper_started_| is set once OnDeviceAdded has been called for all devices
// initially found on the system. |first_enumeration_countdown_| is then
// decremented as DeviceReady is called for these devices.
// |enumeration_callbacks_| holds the callbacks passed to GetDevices before
// this process completes and the device list is ready.
bool helper_started_ = false;
uint32_t first_enumeration_countdown_ = 0;
std::list<GetDevicesCallback> enumeration_callbacks_;
std::unique_ptr<FileThreadHelper> helper_;
DeviceMap devices_by_path_;
base::WeakPtrFactory<UsbServiceLinux> weak_factory_;
DISALLOW_COPY_AND_ASSIGN(UsbServiceLinux);
};
} // namespace device
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