Set serial connection parameters immediately on connect.

device/serial/serial_io_handler.h

 // Copyright 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_SERIAL_SERIAL_IO_HANDLER_H_
 #define DEVICE_SERIAL_SERIAL_IO_HANDLER_H_
 
 #include "base/callback.h"
 #include "base/files/file.h"
 #include "base/memory/ref_counted.h"
@@ skipping 13 matching lines @@
  public:
   // Constructs an instance of some platform-specific subclass.
   static scoped_refptr<SerialIoHandler> Create(
       scoped_refptr<base::MessageLoopProxy> file_thread_message_loop,
       scoped_refptr<base::MessageLoopProxy> ui_thread_message_loop);
 
   typedef base::Callback<void(bool success)> OpenCompleteCallback;
 
   // Initiates an asynchronous Open of the device.
   virtual void Open(const std::string& port,
+                    const serial::ConnectionOptions& options,
                     const OpenCompleteCallback& callback);
 
   // Signals that the access request for |port| is complete.
   void OnRequestAccessComplete(const std::string& port, bool success);
 
   // Performs an async Read operation. Behavior is undefined if this is called
   // while a Read is already pending. Otherwise, the Done or DoneWithError
   // method on |buffer| will eventually be called with a result.
   void Read(scoped_ptr<WritableBuffer> buffer);
 
@@ skipping 23 matching lines @@
   virtual serial::DeviceControlSignalsPtr GetControlSignals() const = 0;
 
   // Sets one or more control signals (DTR and/or RTS). Returns |true| iff
   // the signals were successfully set. Unininitialized flags in the
   // HostControlSignals structure are left unchanged.
   virtual bool SetControlSignals(
       const serial::HostControlSignals& control_signals) = 0;
 
   // Performs platform-specific port configuration. Returns |true| iff
   // configuration was successful.
-  virtual bool ConfigurePort(const serial::ConnectionOptions& options) = 0;
+  bool ConfigurePort(const serial::ConnectionOptions& options);
 
   // Performs a platform-specific port configuration query. Fills values in an
   // existing ConnectionInfo. Returns |true| iff port configuration was
   // successfully retrieved.
   virtual serial::ConnectionInfoPtr GetPortInfo() const = 0;
 
  protected:
   explicit SerialIoHandler(
       scoped_refptr<base::MessageLoopProxy> file_thread_message_loop,
       scoped_refptr<base::MessageLoopProxy> ui_thread_message_loop);
@@ skipping 12 matching lines @@
   // NOTE: Implementations of WriteImpl should never call WriteCompleted
   // directly. Use QueueWriteCompleted instead to avoid reentrancy.
   virtual void WriteImpl() = 0;
 
   // Platform-specific read cancelation.
   virtual void CancelReadImpl() = 0;
 
   // Platform-specific write cancelation.
   virtual void CancelWriteImpl() = 0;
 
+  // Platform-specific port configuration applies options_ to the device.
+  virtual bool ConfigurePortImpl() = 0;
+
   // Requests access to the underlying serial device, if needed.
   virtual void RequestAccess(
       const std::string& port,
       scoped_refptr<base::MessageLoopProxy> file_message_loop,
       scoped_refptr<base::MessageLoopProxy> ui_message_loop);
 
   // Performs platform-specific, one-time port configuration on open.
   virtual bool PostOpen();
 
   // Called by the implementation to signal that the active read has completed.
@@ skipping 37 matching lines @@
   }
 
   uint32_t pending_write_buffer_len() const {
     return pending_write_buffer_ ? pending_write_buffer_->GetSize() : 0;
   }
 
   serial::SendError write_cancel_reason() const { return write_cancel_reason_; }
 
   bool write_canceled() const { return write_canceled_; }
 
+  const serial::ConnectionOptions& options() const { return options_; }
+
   // Possibly fixes up a serial port path name in a platform-specific manner.
   static std::string MaybeFixUpPortName(const std::string& port_name);
 
  private:
   friend class base::RefCounted<SerialIoHandler>;
 
+  void MergeConnectionOptions(const serial::ConnectionOptions& options);
+
   // Continues an Open operation on the FILE thread.
   void StartOpen(const std::string& port,
                  scoped_refptr<base::MessageLoopProxy> io_message_loop);
 
   // Finalizes an Open operation (continued from StartOpen) on the IO thread.
   void FinishOpen(base::File file);
 
   void Close();
 
   // Continues a Close operation on the FILE thread.
   static void DoClose(base::File port);
 
   // File for the opened serial device. This value is only modified from the IO
   // thread.
   base::File file_;
 
+  // Currently applied connection options.
+  serial::ConnectionOptions options_;
+
   scoped_ptr<WritableBuffer> pending_read_buffer_;
   serial::ReceiveError read_cancel_reason_;
   bool read_canceled_;
 
   scoped_ptr<ReadOnlyBuffer> pending_write_buffer_;
   serial::SendError write_cancel_reason_;
   bool write_canceled_;
 
   // Callback to handle the completion of a pending Open() request.
   OpenCompleteCallback open_complete_;
 
   scoped_refptr<base::MessageLoopProxy> file_thread_message_loop_;
   // On Chrome OS, PermissionBrokerClient should be called on the UI thread.
   scoped_refptr<base::MessageLoopProxy> ui_thread_message_loop_;
 
   DISALLOW_COPY_AND_ASSIGN(SerialIoHandler);
 };
 
 }  // namespace device
 
 #endif  // DEVICE_SERIAL_SERIAL_IO_HANDLER_H_