--- a/dom/system/b2g/Makefile.in
+++ b/dom/system/b2g/Makefile.in
@@ -1,43 +1,16 @@
 # ***** BEGIN LICENSE BLOCK *****
-# Version: MPL 1.1/GPL 2.0/LGPL 2.1
-#
-# The contents of this file are subject to the Mozilla Public License Version
-# 1.1 (the "License"); you may not use this file except in compliance with
-# the License. You may obtain a copy of the License at
-# http://www.mozilla.org/MPL/
-#
-# Software distributed under the License is distributed on an "AS IS" basis,
-# WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
-# for the specific language governing rights and limitations under the
-# License.
-#
-# The Original Code is Telephony.
-#
-# The Initial Developer of the Original Code is
-#   The Mozilla Foundation.
-# Portions created by the Initial Developer are Copyright (C) 2011
-# the Initial Developer. All Rights Reserved.
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this file,
+# You can obtain one at http://mozilla.org/MPL/2.0/. */#
 #
 # Contributor(s):
 #   Ben Turner <bent.mozilla@gmail.com> (Original Author)
 #
-# Alternatively, the contents of this file may be used under the terms of
-# either the GNU General Public License Version 2 or later (the "GPL"), or
-# the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
-# in which case the provisions of the GPL or the LGPL are applicable instead
-# of those above. If you wish to allow use of your version of this file only
-# under the terms of either the GPL or the LGPL, and not to allow others to
-# use your version of this file under the terms of the MPL, indicate your
-# decision by deleting the provisions above and replace them with the notice
-# and other provisions required by the GPL or the LGPL. If you do not delete
-# the provisions above, a recipient may use your version of this file under
-# the terms of any one of the MPL, the GPL or the LGPL.
-#
 # ***** END LICENSE BLOCK *****
 
 DEPTH            = ../../..
 topsrcdir        = @top_srcdir@
 srcdir           = @srcdir@
 VPATH            = @srcdir@
 
 include $(DEPTH)/config/autoconf.mk

--- a/hal/Hal.cpp
+++ b/hal/Hal.cpp
@@ -1,44 +1,17 @@
 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
 /* vim: set sw=2 ts=8 et ft=cpp : */
 /* ***** BEGIN LICENSE BLOCK *****
- * Version: MPL 1.1/GPL 2.0/LGPL 2.1
- *
- * The contents of this file are subject to the Mozilla Public License Version
- * 1.1 (the "License"); you may not use this file except in compliance with
- * the License. You may obtain a copy of the License at:
- * http://www.mozilla.org/MPL/
- *
- * Software distributed under the License is distributed on an "AS IS" basis,
- * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
- * for the specific language governing rights and limitations under the
- * License.
- *
- * The Original Code is Mozilla Code.
- *
- * The Initial Developer of the Original Code is
- *   The Mozilla Foundation
- * Portions created by the Initial Developer are Copyright (C) 2011
- * the Initial Developer. All Rights Reserved.
- *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
  * Contributor(s):
  *   Chris Jones <jones.chris.g@gmail.com>
- *
- * Alternatively, the contents of this file may be used under the terms of
- * either the GNU General Public License Version 2 or later (the "GPL"), or
- * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
- * in which case the provisions of the GPL or the LGPL are applicable instead
- * of those above. If you wish to allow use of your version of this file only
- * under the terms of either the GPL or the LGPL, and not to allow others to
- * use your version of this file under the terms of the MPL, indicate your
- * decision by deleting the provisions above and replace them with the notice
- * and other provisions required by the GPL or the LGPL. If you do not delete
- * the provisions above, a recipient may use your version of this file under
- * the terms of any one of the MPL, the GPL or the LGPL.
+ *   Jim Straus <jstraus@mozilla.com>
  *
  * ***** END LICENSE BLOCK ***** */
 
 #include "Hal.h"
 #include "HalImpl.h"
 #include "HalSandbox.h"
 #include "mozilla/Util.h"
 #include "nsThreadUtils.h"
@@ -339,16 +312,28 @@ double GetScreenBrightness()
 }
 
 void SetScreenBrightness(double brightness)
 {
   AssertMainThread();
   PROXY_IF_SANDBOXED(SetScreenBrightness(clamped(brightness, 0.0, 1.0)));
 }
 
+bool SetLight(LightType light, const hal::LightConfiguration& aConfig)
+{
+  AssertMainThread();
+  RETURN_PROXY_IF_SANDBOXED(SetLight(light, aConfig));
+}
+
+bool GetLight(LightType light, hal::LightConfiguration* aConfig)
+{
+  AssertMainThread();
+  RETURN_PROXY_IF_SANDBOXED(GetLight(light, aConfig));
+}
+
 void
 EnableSensorNotifications(SensorType aSensor) {
   AssertMainThread();
   PROXY_IF_SANDBOXED(EnableSensorNotifications(aSensor));
 }
 
 void
 DisableSensorNotifications(SensorType aSensor) {

--- a/hal/Hal.h
+++ b/hal/Hal.h
@@ -1,44 +1,17 @@
 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
 /* vim: set sw=2 ts=8 et ft=cpp : */
 /* ***** BEGIN LICENSE BLOCK *****
- * Version: MPL 1.1/GPL 2.0/LGPL 2.1
- *
- * The contents of this file are subject to the Mozilla Public License Version
- * 1.1 (the "License"); you may not use this file except in compliance with
- * the License. You may obtain a copy of the License at:
- * http://www.mozilla.org/MPL/
- *
- * Software distributed under the License is distributed on an "AS IS" basis,
- * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
- * for the specific language governing rights and limitations under the
- * License.
- *
- * The Original Code is Mozilla Code.
- *
- * The Initial Developer of the Original Code is
- *   The Mozilla Foundation
- * Portions created by the Initial Developer are Copyright (C) 2011
- * the Initial Developer. All Rights Reserved.
- *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
  * Contributor(s):
  *   Chris Jones <jones.chris.g@gmail.com>
- *
- * Alternatively, the contents of this file may be used under the terms of
- * either the GNU General Public License Version 2 or later (the "GPL"), or
- * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
- * in which case the provisions of the GPL or the LGPL are applicable instead
- * of those above. If you wish to allow use of your version of this file only
- * under the terms of either the GPL or the LGPL, and not to allow others to
- * use your version of this file under the terms of the MPL, indicate your
- * decision by deleting the provisions above and replace them with the notice
- * and other provisions required by the GPL or the LGPL. If you do not delete
- * the provisions above, a recipient may use your version of this file under
- * the terms of any one of the MPL, the GPL or the LGPL.
+ *   Jim Straus <jstraus@mozilla.com>
  *
  * ***** END LICENSE BLOCK ***** */
 
 #ifndef mozilla_Hal_h
 #define mozilla_Hal_h 1
 
 #include "mozilla/hal_sandbox/PHal.h"
 #include "base/basictypes.h"
@@ -165,16 +138,33 @@ double GetScreenBrightness();
  *
  * Note that we may reduce the resolution of the given brightness value before
  * sending it to the screen.  Therefore if you call SetScreenBrightness(x)
  * followed by GetScreenBrightness(), the value returned by
  * GetScreenBrightness() may not be exactly x.
  */
 void SetScreenBrightness(double brightness);
 
+/**
+ * Set the value of a light to a particular color, with a specific flash pattern.
+ * light specifices which light.  See Hal.idl for the list of constants
+ * mode specifies user set or based on ambient light sensor
+ * flash specifies whether or how to flash the light
+ * flashOnMS and flashOffMS specify the pattern for XXX flash mode
+ * color specifies the color.  If the light doesn't support color, the given color is
+ * transformed into a brightness, or just an on/off if that is all the light is capable of.
+ * returns true if successful and false if failed.
+ */
+bool SetLight(hal::LightType light, const hal::LightConfiguration& aConfig);
+/**
+ * GET the value of a light returning a particular color, with a specific flash pattern.
+ * returns true if successful and false if failed.
+ */
+bool GetLight(hal::LightType light, hal::LightConfiguration* aConfig);
+
 
 /**
  * Register an observer for the sensor of given type.
  *
  * The observer will receive data whenever the data generated by the
  * sensor is avaiable.
  */
 void RegisterSensorObserver(hal::SensorType aSensor,

--- a/hal/HalImpl.h
+++ b/hal/HalImpl.h
@@ -1,45 +1,17 @@
 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
 /* vim: set sw=2 ts=8 et ft=cpp : */
 /* ***** BEGIN LICENSE BLOCK *****
- * Version: MPL 1.1/GPL 2.0/LGPL 2.1
- *
- * The contents of this file are subject to the Mozilla Public License Version
- * 1.1 (the "License"); you may not use this file except in compliance with
- * the License. You may obtain a copy of the License at:
- * http://www.mozilla.org/MPL/
- *
- * Software distributed under the License is distributed on an "AS IS" basis,
- * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
- * for the specific language governing rights and limitations under the
- * License.
- *
- * The Original Code is Mozilla Code.
- *
- * The Initial Developer of the Original Code is
- *   The Mozilla Foundation
- * Portions created by the Initial Developer are Copyright (C) 2011
- * the Initial Developer. All Rights Reserved.
- *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
  * Contributor(s):
  *   Chris Jones <jones.chris.g@gmail.com>
  *
- * Alternatively, the contents of this file may be used under the terms of
- * either the GNU General Public License Version 2 or later (the "GPL"), or
- * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
- * in which case the provisions of the GPL or the LGPL are applicable instead
- * of those above. If you wish to allow use of your version of this file only
- * under the terms of either the GPL or the LGPL, and not to allow others to
- * use your version of this file under the terms of the MPL, indicate your
- * decision by deleting the provisions above and replace them with the notice
- * and other provisions required by the GPL or the LGPL. If you do not delete
- * the provisions above, a recipient may use your version of this file under
- * the terms of any one of the MPL, the GPL or the LGPL.
- *
  * ***** END LICENSE BLOCK ***** */
 
 #ifndef mozilla_HalImpl_h
 #define mozilla_HalImpl_h
 
 #define MOZ_HAL_NAMESPACE hal_impl
 #undef mozilla_Hal_h
 #undef mozilla_HalInternal_h

new file mode 100644
--- /dev/null
+++ b/hal/HalTypes.h
@@ -0,0 +1,82 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* ***** BEGIN LICENSE BLOCK *****
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ * Contributor(s):
+ *   Mounir Lamouri <mounir.lamouri@mozilla.com> (Original Author)
+ *   Jim Straus <jstraus@mozilla.com>
+ *
+ * ***** END LICENSE BLOCK ***** */
+
+#ifndef mozilla_hal_Types_h
+#define mozilla_hal_Types_h
+
+#include "IPCMessageUtils.h"
+
+namespace mozilla {
+namespace hal {
+
+/**
+ * These are defined by libhardware, specifically, hardware/libhardware/include/hardware/lights.h
+ * in the gonk subsystem.
+ * If these change and are exposed to JS, make sure nsIHal.idl is updated as well.
+ */
+enum LightType {
+    eHalLightID_Backlight = 0,
+    eHalLightID_Keyboard = 1,
+    eHalLightID_Buttons = 2,
+    eHalLightID_Battery = 3,
+    eHalLightID_Notifications = 4,
+    eHalLightID_Attention = 5,
+    eHalLightID_Bluetooth = 6,
+    eHalLightID_Wifi = 7,
+    eHalLightID_Count = 8         // This should stay at the end
+};
+enum LightMode {
+    eHalLightMode_User = 0,       // brightness is managed by user setting
+    eHalLightMode_Sensor = 1      // brightness is managed by a light sensor
+};
+enum FlashMode {
+    eHalLightFlash_None = 0,
+    eHalLightFlash_Timed = 1,     // timed flashing.  Use flashOnMS and flashOffMS for timing
+    eHalLightFlash_Hardware = 2   // hardware assisted flashing
+};
+} // namespace hal
+} // namespace mozilla
+
+namespace IPC {
+
+/**
+ * Light type serializer.
+ */
+template <>
+struct ParamTraits<mozilla::hal::LightType>
+  : public EnumSerializer<mozilla::hal::LightType,
+                          mozilla::hal::eHalLightID_Backlight,
+                          mozilla::hal::eHalLightID_Count>
+{};
+
+/**
+ * Light mode serializer.
+ */
+template <>
+struct ParamTraits<mozilla::hal::LightMode>
+  : public EnumSerializer<mozilla::hal::LightMode,
+                          mozilla::hal::eHalLightMode_User,
+                          mozilla::hal::eHalLightMode_Sensor>
+{};
+
+/**
+ * Flash mode serializer.
+ */
+template <>
+struct ParamTraits<mozilla::hal::FlashMode>
+  : public EnumSerializer<mozilla::hal::FlashMode,
+                          mozilla::hal::eHalLightFlash_None,
+                          mozilla::hal::eHalLightFlash_Hardware>
+{};
+
+} // namespace IPC
+
+#endif // mozilla_hal_Types_h

--- a/hal/Makefile.in
+++ b/hal/Makefile.in
@@ -57,16 +57,17 @@ LIBXUL_LIBRARY = 1
 EXPORT_LIBRARY = 1
 
 EXPORTS_NAMESPACES = mozilla
 EXPORTS_mozilla = \
   Hal.h \
   HalImpl.h \
   HalSandbox.h \
   HalSensor.h \
+  HalTypes.h \
   $(NULL)
 
 CPPSRCS = \
   Hal.cpp \
   SandboxHal.cpp \
   WindowIdentifier.cpp \
   $(NULL)
 
@@ -98,14 +99,18 @@ CPPSRCS += \
   $(NULL)
 else
 CPPSRCS += \
   FallbackHal.cpp \
   FallbackSensor.cpp \
   $(NULL)
 endif
 
+ifneq (gonk,$(MOZ_WIDGET_TOOLKIT)) #{
+CPPSRCS += FallbackLights.cpp
+endif #}
+
 include $(topsrcdir)/config/config.mk
 include $(topsrcdir)/ipc/chromium/chromium-config.mk
 include $(topsrcdir)/config/rules.mk
 
 CFLAGS          += $(MOZ_DBUS_GLIB_CFLAGS)
 CXXFLAGS        += $(MOZ_DBUS_GLIB_CFLAGS)

--- a/hal/fallback/FallbackHal.cpp
+++ b/hal/fallback/FallbackHal.cpp
@@ -1,44 +1,17 @@
 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
 /* vim: set sw=2 ts=8 et ft=cpp : */
 /* ***** BEGIN LICENSE BLOCK *****
- * Version: MPL 1.1/GPL 2.0/LGPL 2.1
- *
- * The contents of this file are subject to the Mozilla Public License Version
- * 1.1 (the "License"); you may not use this file except in compliance with
- * the License. You may obtain a copy of the License at:
- * http://www.mozilla.org/MPL/
- *
- * Software distributed under the License is distributed on an "AS IS" basis,
- * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
- * for the specific language governing rights and limitations under the
- * License.
- *
- * The Original Code is Mozilla Code.
- *
- * The Initial Developer of the Original Code is
- *   The Mozilla Foundation
- * Portions created by the Initial Developer are Copyright (C) 2011
- * the Initial Developer. All Rights Reserved.
- *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
  * Contributor(s):
  *   Chris Jones <jones.chris.g@gmail.com>
- *
- * Alternatively, the contents of this file may be used under the terms of
- * either the GNU General Public License Version 2 or later (the "GPL"), or
- * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
- * in which case the provisions of the GPL or the LGPL are applicable instead
- * of those above. If you wish to allow use of your version of this file only
- * under the terms of either the GPL or the LGPL, and not to allow others to
- * use your version of this file under the terms of the MPL, indicate your
- * decision by deleting the provisions above and replace them with the notice
- * and other provisions required by the GPL or the LGPL. If you do not delete
- * the provisions above, a recipient may use your version of this file under
- * the terms of any one of the MPL, the GPL or the LGPL.
+ *   Jim Straus <jstraus@mozilla.com>
  *
  * ***** END LICENSE BLOCK ***** */
 
 #include "Hal.h"
 #include "mozilla/dom/battery/Constants.h"
 #include "mozilla/dom/network/Constants.h"
 
 using mozilla::hal::WindowIdentifier;

new file mode 100644
--- /dev/null
+++ b/hal/fallback/FallbackLights.cpp
@@ -0,0 +1,28 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ * vim: sw=2 ts=8 et :
+ */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "Hal.h"
+
+namespace mozilla {
+namespace hal_impl {
+
+bool
+SetLight(hal::LightType light, const hal::LightConfiguration& aConfig)
+{
+  return true;
+}
+
+bool
+GetLight(hal::LightType light, hal::LightConfiguration* aConfig)
+{
+  aConfig->light() = light;
+  // The rest of the fields are 0 by default, which is fine.
+  return true;
+}
+
+} // namespace hal_impl
+} // namespace mozilla

--- a/hal/gonk/GonkHal.cpp
+++ b/hal/gonk/GonkHal.cpp
@@ -1,46 +1,19 @@
 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
 /* vim: set sw=2 ts=8 et ft=cpp : */
 /* ***** BEGIN LICENSE BLOCK *****
- * Version: MPL 1.1/GPL 2.0/LGPL 2.1
- *
- * The contents of this file are subject to the Mozilla Public License Version
- * 1.1 (the "License"); you may not use this file except in compliance with
- * the License. You may obtain a copy of the License at:
- * http://www.mozilla.org/MPL/
- *
- * Software distributed under the License is distributed on an "AS IS" basis,
- * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
- * for the specific language governing rights and limitations under the
- * License.
- *
- * The Original Code is Mozilla Code.
- *
- * The Initial Developer of the Original Code is
- *   The Mozilla Foundation
- * Portions created by the Initial Developer are Copyright (C) 2011
- * the Initial Developer. All Rights Reserved.
- *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
  * Contributor(s):
  *   Chris Jones <jones.chris.g@gmail.com>
  *   Michael Wu <mwu@mozilla.com>
  *   Justin Lebar <justin.lebar@gmail.com>
- *
- * Alternatively, the contents of this file may be used under the terms of
- * either the GNU General Public License Version 2 or later (the "GPL"), or
- * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
- * in which case the provisions of the GPL or the LGPL are applicable instead
- * of those above. If you wish to allow use of your version of this file only
- * under the terms of either the GPL or the LGPL, and not to allow others to
- * use your version of this file under the terms of the MPL, indicate your
- * decision by deleting the provisions above and replace them with the notice
- * and other provisions required by the GPL or the LGPL. If you do not delete
- * the provisions above, a recipient may use your version of this file under
- * the terms of any one of the MPL, the GPL or the LGPL.
+ *   Jim Straus <jstraus@mozilla.com>
  *
  * ***** END LICENSE BLOCK ***** */
 
 #include "hardware_legacy/uevent.h"
 #include "Hal.h"
 #include "HalImpl.h"
 #include "mozilla/dom/battery/Constants.h"
 #include "mozilla/FileUtils.h"
@@ -49,16 +22,18 @@
 #include "mozilla/Monitor.h"
 #include "mozilla/Services.h"
 #include "mozilla/FileUtils.h"
 #include "nsThreadUtils.h"
 #include "nsIRunnable.h"
 #include "nsIThread.h"
 #include "nsIObserver.h"
 #include "nsIObserverService.h"
+#include "hardware/lights.h"
+#include "hardware/hardware.h"
 #include "hardware_legacy/vibrator.h"
 #include <stdio.h>
 #include <math.h>
 #include <fcntl.h>
 #include <errno.h>
 #include "mozilla/dom/network/Constants.h"
 
 using mozilla::hal::WindowIdentifier;
@@ -309,17 +284,16 @@ GetCurrentBatteryInformation(hal::Batter
 }
 
 namespace {
 
 /**
  * RAII class to help us remember to close file descriptors.
  */
 const char *screenEnabledFilename = "/sys/power/state";
-const char *screenBrightnessFilename = "/sys/class/leds/lcd-backlight/brightness";
 
 template<ssize_t n>
 bool ReadFromFile(const char *filename, char (&buf)[n])
 {
   int fd = open(filename, O_RDONLY);
   ScopedClose autoClose(fd);
   if (fd < 0) {
     HAL_LOG(("Unable to open file %s.", filename));
@@ -369,55 +343,152 @@ SetScreenEnabled(bool enabled)
 {
   WriteToFile(screenEnabledFilename, enabled ? "on" : "mem");
   sScreenEnabled = enabled;
 }
 
 double
 GetScreenBrightness()
 {
-  char buf[32];
-  ReadFromFile(screenBrightnessFilename, buf);
+  hal::LightConfiguration aConfig;
+  hal::LightType light = hal::eHalLightID_Backlight;
 
-  errno = 0;
-  unsigned long val = strtoul(buf, NULL, 10);
-  if (errno) {
-    HAL_LOG(("Cannot parse contents of %s; expected an unsigned "
-             "int, but contains \"%s\".",
-             screenBrightnessFilename, buf));
-    return 1;
-  }
-
-  if (val > 255) {
-    HAL_LOG(("Got out-of-range brightness %d, truncating to 1.0", val));
-    val = 255;
-  }
-
-  return val / 255.0;
+  hal::GetLight(light, &aConfig);
+  // backlight is brightness only, so using one of the RGB elements as value.
+  int brightness = aConfig.color() & 0xFF;
+  return brightness / 255.0;
 }
 
 void
 SetScreenBrightness(double brightness)
 {
   // Don't use De Morgan's law to push the ! into this expression; we want to
   // catch NaN too.
   if (!(0 <= brightness && brightness <= 1)) {
     HAL_LOG(("SetScreenBrightness: Dropping illegal brightness %f.",
              brightness));
     return;
   }
 
-  // Convert the value in [0, 1] to an int between 0 and 255, then write to a
-  // string.
+  // Convert the value in [0, 1] to an int between 0 and 255 and convert to a color
+  // note that the high byte is FF, corresponding to the alpha channel.
   int val = static_cast<int>(round(brightness * 255));
-  char str[4];
-  DebugOnly<int> numChars = snprintf(str, sizeof(str), "%d", val);
-  MOZ_ASSERT(numChars < static_cast<int>(sizeof(str)));
+  uint32_t color = (0xff<<24) + (val<<16) + (val<<8) + val;
+
+  hal::LightConfiguration aConfig;
+  aConfig.mode() = hal::eHalLightMode_User;
+  aConfig.flash() = hal::eHalLightFlash_None;
+  aConfig.flashOnMS() = aConfig.flashOffMS() = 0;
+  aConfig.color() = color;
+  hal::SetLight(hal::eHalLightID_Backlight, aConfig);
+}
+
+static light_device_t* sLights[hal::eHalLightID_Count];	// will be initialized to NULL
+
+light_device_t* GetDevice(hw_module_t* module, char const* name)
+{
+  int err;
+  hw_device_t* device;
+  err = module->methods->open(module, name, &device);
+  if (err == 0) {
+    return (light_device_t*)device;
+  } else {
+    return NULL;
+  }
+}
+
+void
+InitLights()
+{
+  // assume that if backlight is NULL, nothing has been set yet
+  // if this is not true, the initialization will occur everytime a light is read or set!
+  if (!sLights[hal::eHalLightID_Backlight]) {
+    int err;
+    hw_module_t* module;
+
+    err = hw_get_module(LIGHTS_HARDWARE_MODULE_ID, (hw_module_t const**)&module);
+    if (err == 0) {
+      sLights[hal::eHalLightID_Backlight]
+             = GetDevice(module, LIGHT_ID_BACKLIGHT);
+      sLights[hal::eHalLightID_Keyboard]
+             = GetDevice(module, LIGHT_ID_KEYBOARD);
+      sLights[hal::eHalLightID_Buttons]
+             = GetDevice(module, LIGHT_ID_BUTTONS);
+      sLights[hal::eHalLightID_Battery]
+             = GetDevice(module, LIGHT_ID_BATTERY);
+      sLights[hal::eHalLightID_Notifications]
+             = GetDevice(module, LIGHT_ID_NOTIFICATIONS);
+      sLights[hal::eHalLightID_Attention]
+             = GetDevice(module, LIGHT_ID_ATTENTION);
+      sLights[hal::eHalLightID_Bluetooth]
+             = GetDevice(module, LIGHT_ID_BLUETOOTH);
+      sLights[hal::eHalLightID_Wifi]
+             = GetDevice(module, LIGHT_ID_WIFI);
+        }
+    }
+}
 
-  WriteToFile(screenBrightnessFilename, str);
+/**
+ * The state last set for the lights until liblights supports
+ * getting the light state.
+ */
+static light_state_t sStoredLightState[hal::eHalLightID_Count];
+
+bool
+SetLight(hal::LightType light, const hal::LightConfiguration& aConfig)
+{
+  light_state_t state;
+
+  InitLights();
+
+  if (light < 0 || light >= hal::eHalLightID_Count || sLights[light] == NULL) {
+    return false;
+  }
+
+  memset(&state, 0, sizeof(light_state_t));
+  state.color = aConfig.color();
+  state.flashMode = aConfig.flash();
+  state.flashOnMS = aConfig.flashOnMS();
+  state.flashOffMS = aConfig.flashOffMS();
+  state.brightnessMode = aConfig.mode();
+
+  sLights[light]->set_light(sLights[light], &state);
+  sStoredLightState[light] = state;
+  return true;
+}
+
+bool
+GetLight(hal::LightType light, hal::LightConfiguration* aConfig)
+{
+  light_state_t state;
+
+#ifdef HAVEGETLIGHT
+  InitLights();
+#endif
+
+  if (light < 0 || light >= hal::eHalLightID_Count || sLights[light] == NULL) {
+    return false;
+  }
+
+  memset(&state, 0, sizeof(light_state_t));
+
+#ifdef HAVEGETLIGHT
+  sLights[light]->get_light(sLights[light], &state);
+#else
+  state = sStoredLightState[light];
+#endif
+
+  aConfig->light() = light;
+  aConfig->color() = state.color;
+  aConfig->flash() = hal::FlashMode(state.flashMode);
+  aConfig->flashOnMS() = state.flashOnMS;
+  aConfig->flashOffMS() = state.flashOffMS;
+  aConfig->mode() = hal::LightMode(state.brightnessMode);
+
+  return true;
 }
 
 void
 EnableNetworkNotifications()
 {}
 
 void
 DisableNetworkNotifications()

--- a/hal/sandbox/PHal.ipdl
+++ b/hal/sandbox/PHal.ipdl
@@ -36,29 +36,42 @@
  * the terms of any one of the MPL, the GPL or the LGPL.
  *
  * ***** END LICENSE BLOCK ***** */
 
 include protocol PContent;
 include protocol PBrowser;
 include "nspr/prtime.h";
 include "mozilla/HalSensor.h";
+include "mozilla/HalTypes.h";
 
 using PRTime;
+using mozilla::hal::FlashMode;
+using mozilla::hal::LightType;
+using mozilla::hal::LightMode;
 using mozilla::hal::SensorType;
 
 namespace mozilla {
 
 namespace hal {
   struct BatteryInformation {
     double level;
     bool   charging;
     double remainingTime;
   };
 
+  struct LightConfiguration {
+    LightType light;
+    LightMode mode;
+    FlashMode flash;
+    uint32_t flashOnMS;
+    uint32_t flashOffMS;
+    uint32_t color;
+  };
+
   struct SensorData {
     SensorType sensor;
     PRTime timestamp;
     float[] values;
   };
 }
 
 namespace hal {
@@ -93,16 +106,21 @@ parent:
       returns (NetworkInformation aNetworkInfo);
 
     sync GetScreenEnabled() returns (bool enabled);
     SetScreenEnabled(bool enabled);
 
     sync GetScreenBrightness() returns (double brightness);
     SetScreenBrightness(double brightness);
 
+    sync SetLight(LightType light, LightConfiguration aConfig)
+      returns (bool status);
+    sync GetLight(LightType light)
+      returns (LightConfiguration aConfig, bool status);
+
     Reboot();
     PowerOff();
 
     EnableSensorNotifications(SensorType aSensor);
     DisableSensorNotifications(SensorType aSensor);
 
     __delete__();
 };

--- a/hal/sandbox/SandboxHal.cpp
+++ b/hal/sandbox/SandboxHal.cpp
@@ -1,44 +1,17 @@
 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
 /* vim: set sw=2 ts=8 et ft=cpp : */
 /* ***** BEGIN LICENSE BLOCK *****
- * Version: MPL 1.1/GPL 2.0/LGPL 2.1
- *
- * The contents of this file are subject to the Mozilla Public License Version
- * 1.1 (the "License"); you may not use this file except in compliance with
- * the License. You may obtain a copy of the License at:
- * http://www.mozilla.org/MPL/
- *
- * Software distributed under the License is distributed on an "AS IS" basis,
- * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
- * for the specific language governing rights and limitations under the
- * License.
- *
- * The Original Code is Mozilla Code.
- *
- * The Initial Developer of the Original Code is
- *   The Mozilla Foundation
- * Portions created by the Initial Developer are Copyright (C) 2011
- * the Initial Developer. All Rights Reserved.
- *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
  * Contributor(s):
  *   Chris Jones <jones.chris.g@gmail.com>
- *
- * Alternatively, the contents of this file may be used under the terms of
- * either the GNU General Public License Version 2 or later (the "GPL"), or
- * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
- * in which case the provisions of the GPL or the LGPL are applicable instead
- * of those above. If you wish to allow use of your version of this file only
- * under the terms of either the GPL or the LGPL, and not to allow others to
- * use your version of this file under the terms of the MPL, indicate your
- * decision by deleting the provisions above and replace them with the notice
- * and other provisions required by the GPL or the LGPL. If you do not delete
- * the provisions above, a recipient may use your version of this file under
- * the terms of any one of the MPL, the GPL or the LGPL.
+ *   Jim Straus <jstraus@mozilla.com>
  *
  * ***** END LICENSE BLOCK ***** */
 
 #include "Hal.h"
 #include "mozilla/dom/ContentChild.h"
 #include "mozilla/hal_sandbox/PHalChild.h"
 #include "mozilla/hal_sandbox/PHalParent.h"
 #include "mozilla/dom/TabParent.h"
@@ -147,16 +120,32 @@ GetScreenBrightness()
 }
 
 void
 SetScreenBrightness(double brightness)
 {
   Hal()->SendSetScreenBrightness(brightness);
 }
 
+bool
+SetLight(hal::LightType light, const hal::LightConfiguration& aConfig)
+{
+  bool status;
+  Hal()->SendSetLight(light, aConfig, &status);
+  return status;
+}
+
+bool
+GetLight(hal::LightType light, hal::LightConfiguration* aConfig)
+{
+  bool status;
+  Hal()->SendGetLight(light, aConfig, &status);
+  return status;
+}
+
 void
 Reboot()
 {
   Hal()->SendReboot();
 }
 
 void
 PowerOff()
@@ -287,16 +276,30 @@ public:
   NS_OVERRIDE virtual bool
   RecvSetScreenBrightness(const double &brightness)
   {
     hal::SetScreenBrightness(brightness);
     return true;
   }
 
   NS_OVERRIDE virtual bool
+  RecvSetLight(const LightType& aLight,  const hal::LightConfiguration& aConfig, bool *status)
+  {
+    *status = hal::SetLight(aLight, aConfig);
+    return true;
+  }
+
+  NS_OVERRIDE virtual bool
+  RecvGetLight(const LightType& aLight, LightConfiguration* aConfig, bool* status)
+  {
+    *status = hal::GetLight(aLight, aConfig);
+    return true;
+  }
+
+  NS_OVERRIDE virtual bool
   RecvReboot()
   {
     hal::Reboot();
     return true;
   }
 
   NS_OVERRIDE virtual bool
   RecvPowerOff()

--- a/hal/sandbox/SandboxHal.h
+++ b/hal/sandbox/SandboxHal.h
@@ -1,45 +1,17 @@
 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
 /* vim: set sw=2 ts=8 et ft=cpp : */
 /* ***** BEGIN LICENSE BLOCK *****
- * Version: MPL 1.1/GPL 2.0/LGPL 2.1
- *
- * The contents of this file are subject to the Mozilla Public License Version
- * 1.1 (the "License"); you may not use this file except in compliance with
- * the License. You may obtain a copy of the License at:
- * http://www.mozilla.org/MPL/
- *
- * Software distributed under the License is distributed on an "AS IS" basis,
- * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
- * for the specific language governing rights and limitations under the
- * License.
- *
- * The Original Code is Mozilla Code.
- *
- * The Initial Developer of the Original Code is
- *   The Mozilla Foundation
- * Portions created by the Initial Developer are Copyright (C) 2011
- * the Initial Developer. All Rights Reserved.
- *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
  * Contributor(s):
  *   Chris Jones <jones.chris.g@gmail.com>
  *
- * Alternatively, the contents of this file may be used under the terms of
- * either the GNU General Public License Version 2 or later (the "GPL"), or
- * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
- * in which case the provisions of the GPL or the LGPL are applicable instead
- * of those above. If you wish to allow use of your version of this file only
- * under the terms of either the GPL or the LGPL, and not to allow others to
- * use your version of this file under the terms of the MPL, indicate your
- * decision by deleting the provisions above and replace them with the notice
- * and other provisions required by the GPL or the LGPL. If you do not delete
- * the provisions above, a recipient may use your version of this file under
- * the terms of any one of the MPL, the GPL or the LGPL.
- *
  * ***** END LICENSE BLOCK ***** */
 
 #ifndef mozilla_SandboxHal_h
 #define mozilla_SandboxHal_h
 
 namespace mozilla {
 namespace hal_sandbox {
 

--- a/toolkit/library/Makefile.in
+++ b/toolkit/library/Makefile.in
@@ -1,44 +1,16 @@
 #
 # ***** BEGIN LICENSE BLOCK *****
-# Version: MPL 1.1/GPL 2.0/LGPL 2.1
-#
-# The contents of this file are subject to the Mozilla Public License Version
-# 1.1 (the "License"); you may not use this file except in compliance with
-# the License. You may obtain a copy of the License at
-# http://www.mozilla.org/MPL/
-#
-# Software distributed under the License is distributed on an "AS IS" basis,
-# WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
-# for the specific language governing rights and limitations under the
-# License.
-#
-# The Original Code is mozilla.org code.
-#
-# The Initial Developer of the Original Code is
-# Benjamin Smedberg <benjamin@smedbergs.us>
-# Portions created by the Initial Developer are Copyright (C) 1998
-# the Initial Developer. All Rights Reserved.
-#
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this file,
+# You can obtain one at http://mozilla.org/MPL/2.0/.
 # Contributor(s):
 #   Shawn Wilsher <me@shawnwilsher.com>
 #
-# Alternatively, the contents of this file may be used under the terms of
-# either of the GNU General Public License Version 2 or later (the "GPL"),
-# or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
-# in which case the provisions of the GPL or the LGPL are applicable instead
-# of those above. If you wish to allow use of your version of this file only
-# under the terms of either the GPL or the LGPL, and not to allow others to
-# use your version of this file under the terms of the MPL, indicate your
-# decision by deleting the provisions above and replace them with the notice
-# and other provisions required by the GPL or the LGPL. If you do not delete
-# the provisions above, a recipient may use your version of this file under
-# the terms of any one of the MPL, the GPL or the LGPL.
-#
 # ***** END LICENSE BLOCK *****
 
 DEPTH     = ../..
 topsrcdir = @top_srcdir@
 srcdir    = @srcdir@
 VPATH     = @srcdir@
 
 include $(DEPTH)/config/autoconf.mk