HID backend

device/hid/hid_connection.h

Index: device/hid/hid_connection.h
diff --git a/device/hid/hid_connection.h b/device/hid/hid_connection.h
new file mode 100644
index 0000000000000000000000000000000000000000..b562b7ae0c81ebc8fccf100e5ecd4b5a05237210
--- /dev/null
+++ b/device/hid/hid_connection.h
@@ -0,0 +1,49 @@
+// 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_H_
+#define DEVICE_HID_HID_CONNECTION_H_
+
+#include "base/callback.h"
+#include "base/memory/ref_counted.h"
+#include "device/hid/hid_device_info.h"
+
+namespace net {
+class IOBuffer;
+}
+
+namespace device {
+
+typedef base::Callback<
+    void(bool success, scoped_refptr<net::IOBuffer> buffer, size_t size)>
+    HidIOCallback;

[Ken Rockot(use gerrit already), 2014/01/21 23:03:39]

nit: Maybe move into HidConnection as HidConnection::IOCallback?

[Bei Zhang, 2014/01/24 12:48:47]

Done.

+
+class HidConnection : public base::RefCountedThreadSafe<HidConnection> {
+ public:
+  virtual void Read(const HidIOCallback& callback) = 0;
+  virtual void Write(scoped_refptr<net::IOBuffer> buffer,
+                     size_t size,
+                     const HidIOCallback& callback) = 0;
+  virtual void GetFeatureReport(const HidIOCallback& callback) = 0;
+  virtual void SendFeatureReport(scoped_refptr<net::IOBuffer> buffer,
+                                 size_t size,
+                                 const HidIOCallback& callback) = 0;
+
+  const HidDeviceInfo& device_info() const;
+
+ protected:
+  friend class base::RefCountedThreadSafe<HidConnection>;
+  friend class HidDevice;
+
+  HidConnection(HidDeviceInfo device_info);
+  virtual ~HidConnection();
+
+  const HidDeviceInfo device_info_;
+
+  DISALLOW_COPY_AND_ASSIGN(HidConnection);
+};
+
+}  // namespace device
+
+#endif  // DEVICE_HID_HID_CONNECTION_H_