ozone: evdev: Sync caps lock LED state to evdev

ui/events/ozone/evdev/event_converter_evdev.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 <linux/input.h>
 
 #include "ui/events/ozone/evdev/event_converter_evdev.h"
 
 #include "base/files/file_path.h"
 #include "base/logging.h"
@@ skipping 12 matching lines @@
 EventConverterEvdev::~EventConverterEvdev() {
   Stop();
 }
 
 void EventConverterEvdev::Start() {
   base::MessageLoopForUI::current()->WatchFileDescriptor(
       fd_, true, base::MessagePumpLibevent::WATCH_READ, &controller_, this);
 }
 
 void EventConverterEvdev::Stop() {
+  // TODO(spang): If we reach here due to an error, we should treat it
+  // as if we have lost sync & release held keys, etc.
   controller_.StopWatchingFileDescriptor();
 }
 
 void EventConverterEvdev::OnFileCanWriteWithoutBlocking(int fd) {
   NOTREACHED();
 }
 
 bool EventConverterEvdev::HasKeyboard() const {
   return false;
 }
 
 bool EventConverterEvdev::HasMouse() const {
   return false;
 }
 
 bool EventConverterEvdev::HasTouchpad() const {
   return false;
 }
 
 bool EventConverterEvdev::HasTouchscreen() const {
   return false;
 }
 
+bool EventConverterEvdev::HasCapsLockLed() const {
+  return false;
+}
+
 gfx::Size EventConverterEvdev::GetTouchscreenSize() const {
   NOTREACHED();
   return gfx::Size();
 }
 
 int EventConverterEvdev::GetTouchPoints() const {
   NOTREACHED();
   return 0;
 }
 
 void EventConverterEvdev::SetAllowedKeys(
     scoped_ptr<std::set<DomCode>> allowed_keys) {
   NOTREACHED();
 }
 
 void EventConverterEvdev::AllowAllKeys() {
   NOTREACHED();
 }
 
+void EventConverterEvdev::SetCapsLockLed(bool enabled) {
+  if (!HasCapsLockLed())
+    return;
+
+  input_event events[2];
+  memset(&events, 0, sizeof(events));
+
+  events[0].type = EV_LED;
+  events[0].code = LED_CAPSL;
+  events[0].value = enabled;
+
+  events[1].type = EV_SYN;
+  events[1].code = SYN_REPORT;
+  events[1].value = 0;
+
+  ssize_t written = write(fd_, events, sizeof(events));
+
+  if (written < 0) {
+    if (errno != ENODEV)
+      PLOG(ERROR) << "cannot set leds for " << path_.value() << ":";
+    Stop();
+  } else if (written != sizeof(events)) {
+    LOG(ERROR) << "short write setting leds for " << path_.value();
+    Stop();
+  }
+}
+
 base::TimeDelta EventConverterEvdev::TimeDeltaFromInputEvent(
     const input_event& event) {
   return base::TimeDelta::FromMicroseconds(event.time.tv_sec * 1000000 +
                                            event.time.tv_usec);
 }
 }  // namespace ui