device/hid/hid_connection_linux.h

// Copyright (c) 2014 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.

#ifndef DEVICE_HID_HID_CONNECTION_LINUX_H_
#define DEVICE_HID_HID_CONNECTION_LINUX_H_

#include <queue>

#include "base/files/file.h"
#include "base/message_loop/message_pump_libevent.h"
#include "device/hid/hid_connection.h"

namespace device {

class HidConnectionLinux : public HidConnection,
                           public base::MessagePumpLibevent::Watcher {
 public:
  HidConnectionLinux(HidDeviceInfo device_info, std::string dev_node);

 private:
  friend class base::RefCountedThreadSafe<HidConnectionLinux>;
  ~HidConnectionLinux() override;

  // HidConnection implementation.
  void PlatformClose() override;
  void PlatformRead(const ReadCallback& callback) override;
  void PlatformWrite(scoped_refptr<net::IOBuffer> buffer,
                     size_t size,
                     const WriteCallback& callback) override;
  void PlatformGetFeatureReport(uint8_t report_id,
                                const ReadCallback& callback) override;
  void PlatformSendFeatureReport(scoped_refptr<net::IOBuffer> buffer,
                                 size_t size,
                                 const WriteCallback& callback) override;

  // base::MessagePumpLibevent::Watcher implementation.
  void OnFileCanReadWithoutBlocking(int fd) override;
  void OnFileCanWriteWithoutBlocking(int fd) override;

  void Disconnect();

  void Flush();
  void ProcessInputReport(scoped_refptr<net::IOBuffer> buffer, size_t size);
  void ProcessReadQueue();

  base::File device_file_;
  base::MessagePumpLibevent::FileDescriptorWatcher device_file_watcher_;

  std::queue<PendingHidReport> pending_reports_;
  std::queue<PendingHidRead> pending_reads_;

  DISALLOW_COPY_AND_ASSIGN(HidConnectionLinux);
};

}  // namespace device

#endif  // DEVICE_HID_HID_CONNECTION_LINUX_H_