HID : read-only device access fallback when read/write fails

device/hid/hid_service_win.cc

 // 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.
 
 #include "device/hid/hid_service_win.h"
 
 #include <cstdlib>
 
 #include "base/stl_util.h"
 #include "base/strings/sys_string_conversions.h"
@@ skipping 130 matching lines @@
 }
 
 void HidServiceWin::PlatformAddDevice(const std::string& device_path) {
   HidDeviceInfo device_info;
   device_info.device_id = device_path;
 
   // Try to open the device.
   base::win::ScopedHandle device_handle(
       CreateFileA(device_path.c_str(),
                   0,
-                  FILE_SHARE_READ | FILE_SHARE_WRITE,
+                  FILE_SHARE_READ,
                   NULL,
                   OPEN_EXISTING,
                   FILE_FLAG_OVERLAPPED,
                   0));
   if (!device_handle.IsValid())
     return;
 
   // Get VID/PID pair.
   HIDD_ATTRIBUTES attrib = {0};
   attrib.Size = sizeof(HIDD_ATTRIBUTES);
@@ skipping 88 matching lines @@
     return NULL;
   scoped_refptr<HidConnectionWin> connection(new HidConnectionWin(device_info));
   if (!connection->available()) {
     LOG_GETLASTERROR(ERROR) << "Failed to open device.";
     return NULL;
   }
   return connection;
 }
 
 }  // namespace device