Move evdev events support into EventFactoryDelegateEvdev

ui/events/ozone/evdev/event_factory_delegate_evdev.cc

+// Copyright (c) 2013 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 "ui/events/ozone/evdev/event_factory_delegate_evdev.h"
+
+#include <errno.h>
+#include <fcntl.h>
+#include <linux/input.h>
+#include <poll.h>
+#include <unistd.h>
+
+#include "base/strings/stringprintf.h"
+#include "ui/events/ozone/evdev/key_event_converter_evdev.h"
+#include "ui/events/ozone/evdev/touch_event_converter_evdev.h"
+#include "ui/events/ozone/event_factory_delegate_ozone.h"
+#include "ui/events/ozone/event_factory_ozone.h"
+
+namespace ui {
+
+EventFactoryDelegateEvdev::EventFactoryDelegateEvdev() {}
+
+EventFactoryDelegateEvdev::~EventFactoryDelegateEvdev() {}
+
+void EventFactoryDelegateEvdev::CreateStartupEventConverters(
+    EventFactoryOzone* factory) {
+  // The number of devices in the directory is unknown without reading
+  // the contents of the directory. Further, with hot-plugging,  the entries
+  // might decrease during the execution of this loop. So exciting from the
+  // loop on the first failure of open below is both cheaper and more
+  // reliable.
+  for (int id = 0; true; id++) {
+    std::string path = base::StringPrintf("/dev/input/event%d", id);
+    int fd = open(path.c_str(), O_RDONLY | O_NONBLOCK);
+    if (fd < 0) {
+      DLOG(ERROR) << "Cannot open '" << path << "': " << strerror(errno);
+      break;
+    }
+    size_t evtype = 0;
+    COMPILE_ASSERT(sizeof(evtype) * 8 >= EV_MAX, evtype_wide_enough);
+    if (ioctl(fd, EVIOCGBIT(0, sizeof(evtype)), &evtype) == -1) {
+      DLOG(ERROR) << "failed ioctl EVIOCGBIT 0" << path;
+      close(fd);
+      continue;
+    }
+
+    scoped_ptr<EventConverterOzone> converter;
+    // TODO(rjkroege) Add more device types. Support hot-plugging.
+    if (evtype & (1 << EV_ABS))
+      converter.reset(new TouchEventConverterEvdev(fd, id));
+    else if (evtype & (1 << EV_KEY))
+      converter.reset(new KeyEventConverterEvdev());
+
+    if (converter) {
+      factory->AddEventConverter(fd, converter.Pass());
+    } else {
+      close(fd);
+    }
+  }
+}
+
+}  // namespace ui