device/hid/hid_connection_linux.h

   1 // Copyright (c) 2014 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef DEVICE_HID_HID_CONNECTION_LINUX_H_
   6 #define DEVICE_HID_HID_CONNECTION_LINUX_H_
   7
   8 #include <queue>
   9
  10 #include "base/files/file.h"
  11 #include "base/memory/ref_counted.h"
  12 #include "base/message_loop/message_pump_libevent.h"
  13 #include "device/hid/hid_connection.h"
  14 #include "device/hid/hid_device_info.h"
  15 #include "device/hid/udev_common.h"
  16
  17 namespace device {
  18
  19 class HidConnectionLinux : public HidConnection,
  20                            public base::MessagePumpLibevent::Watcher {
  21  public:
  22   HidConnectionLinux(HidDeviceInfo device_info, std::string dev_node);
  23
  24   virtual void Read(scoped_refptr<net::IOBufferWithSize> buffer,
  25                     const IOCallback& callback) OVERRIDE;
  26   virtual void Write(uint8_t report_id,
  27                      scoped_refptr<net::IOBufferWithSize> buffer,
  28                      const IOCallback& callback) OVERRIDE;
  29   virtual void GetFeatureReport(uint8_t report_id,
  30                                 scoped_refptr<net::IOBufferWithSize> buffer,
  31                                 const IOCallback& callback) OVERRIDE;
  32   virtual void SendFeatureReport(uint8_t report_id,
  33                                  scoped_refptr<net::IOBufferWithSize> buffer,
  34                                  const IOCallback& callback) OVERRIDE;
  35
  36   // Implements base::MessagePumpLibevent::Watcher
  37   virtual void OnFileCanReadWithoutBlocking(int fd) OVERRIDE;
  38   virtual void OnFileCanWriteWithoutBlocking(int fd) OVERRIDE;
  39
  40  private:
  41   friend class base::RefCountedThreadSafe<HidConnectionLinux>;
  42   virtual ~HidConnectionLinux();
  43
  44   void ProcessReadQueue();
  45   void Disconnect();
  46
  47   base::File device_file_;
  48   base::MessagePumpLibevent::FileDescriptorWatcher device_file_watcher_;
  49
  50   std::queue<PendingHidReport> pending_reports_;
  51   std::queue<PendingHidRead> pending_reads_;
  52
  53   base::ThreadChecker thread_checker_;
  54
  55   DISALLOW_COPY_AND_ASSIGN(HidConnectionLinux);
  56 };
  57
  58 }  // namespace device
  59
  60 #endif  // DEVICE_HID_HID_CONNECTION_LINUX__