HID backend

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 "base/memory/ref_counted.h"
+#include "base/platform_file.h"
+#include "base/tuple.h"
+#include "device/hid/hid_connection.h"
+#include "device/hid/hid_device_info.h"
+#include "device/hid/hid_service_linux.h"
+#include "net/base/io_buffer.h"
+
+namespace device {
+
+class HidConnectionLinux : public HidConnection,
+                           public base::MessagePumpLibevent::Watcher {
+ public:
+  HidConnectionLinux(HidDeviceInfo device_info,
+                     ScopedUdevDevicePtr udev_raw_device);
+
+  virtual void Read(scoped_refptr<net::IOBuffer> buffer,
+                    size_t size,
+                    const IOCallback& callback) OVERRIDE;
+  virtual void Write(scoped_refptr<net::IOBuffer> buffer,
+                     size_t size,
+                     const IOCallback& callback) OVERRIDE;
+  virtual void GetFeatureReport(scoped_refptr<net::IOBuffer> buffer,
+                                size_t size,
+                                const IOCallback& callback) OVERRIDE;
+  virtual void SendFeatureReport(scoped_refptr<net::IOBuffer> buffer,
+                                 size_t size,
+                                 const IOCallback& callback) OVERRIDE;
+
+  bool initialized() const { return initialized_; }
+
+  // Implements base::MessagePumpLibevent::Watcher
+  virtual void OnFileCanReadWithoutBlocking(int fd) OVERRIDE;
+  virtual void OnFileCanWriteWithoutBlocking(int fd) OVERRIDE;
+
+ private:
+  friend class base::RefCountedThreadSafe<HidConnectionLinux>;
+  virtual ~HidConnectionLinux();
+
+  static bool FindHidrawDevNode(udev_device* parent, std::string* result);
+
+  void ProcessReadQueue();
+  void Disconnect();
+
+  base::PlatformFile device_file_;
+  base::MessagePumpLibevent::FileDescriptorWatcher device_file_watcher_;
+
+  typedef std::pair<scoped_refptr<net::IOBuffer>, size_t> PendingReport;
+  typedef Tuple3<scoped_refptr<net::IOBuffer>, size_t, IOCallback>
+      PendingRequest;
+
+  std::queue<PendingReport> input_reports_;
+  std::queue<PendingRequest> read_queue_;
+
+  bool initialized_;
+
+  DISALLOW_COPY_AND_ASSIGN(HidConnectionLinux);
+};
+
+}  // namespace device
+
+#endif  // DEVICE_HID_HID_CONNECTION_LINUX__