Backlight settings, preliminary, but works

based on CM9 code

Change-Id: Iddcbee98f6588bba428c4059e786d946d7ce2298

core/java/android/os/IPowerManager.aidl

@@ -46,4 +46,11 @@ interface IPowerManager
     void setBacklightBrightness(int brightness);
     void setAttentionLight(boolean on, int color);
     void setAutoBrightnessAdjustment(float adj);
+
+    // custom backlight things
+    int getLightSensorValue();
+    int getRawLightSensorValue();
+    int getLightSensorScreenBrightness();
+    int getLightSensorButtonBrightness();
+    int getLightSensorKeyboardBrightness();
 }

core/java/android/provider/Settings.java

@@ -1468,6 +1468,136 @@ public static void setShowGTalkServiceStatus(ContentResolver cr, boolean flag) {
          */
         public static final int SCREEN_BRIGHTNESS_MODE_AUTOMATIC = 1;
 
+        /**
+         * Indicates that custom light sensor settings has changed. The value is
+         * random and changes reloads light settings.
+         *
+         * @hide
+         */
+        public static final String LIGHTS_CHANGED = "lights_changed";
+
+        /**
+         * Whether custom light sensor levels & values are enabled. The value is
+         * boolean (1 or 0).
+         *
+         * @hide
+         */
+        public static final String LIGHT_SENSOR_CUSTOM = "light_sensor_custom";
+
+        /**
+         * Screen dim value to use if LIGHT_SENSOR_CUSTOM is set. The value is int.
+         * Default is android.os.BRIGHTNESS_DIM.
+         *
+         * @hide
+         */
+        public static final String LIGHT_SCREEN_DIM = "light_screen_dim";
+
+        /**
+         * Custom light sensor levels. The value is a comma separated int array
+         * with length N.
+         * Example: "100,300,3000".
+         *
+         * @hide
+         */
+        public static final String LIGHT_SENSOR_LEVELS = "light_sensor_levels";
+
+        /**
+         * Custom light sensor lcd values. The value is a comma separated int array
+         * with length N+1.
+         * Example: "10,50,100,255".
+         *
+         * @hide
+         */
+        public static final String LIGHT_SENSOR_LCD_VALUES = "light_sensor_lcd_values";
+
+        /**
+         * Custom light sensor lcd values. The value is a comma separated int array
+         * with length N+1.
+         * Example: "10,50,100,255".
+         *
+         * @hide
+         */
+        public static final String LIGHT_SENSOR_BUTTON_VALUES = "light_sensor_button_values";
+
+        /**
+         * Custom light sensor lcd values. The value is a comma separated int array
+         * with length N+1.
+         * Example: "10,50,100,255".
+         *
+         * @hide
+         */
+        public static final String LIGHT_SENSOR_KEYBOARD_VALUES = "light_sensor_keyboard_values";
+
+        /**
+         * Whether light sensor is allowed to decrease when calculating automatic
+         * backlight. The value is boolean (1 or 0).
+         *
+         * @hide
+         */
+        public static final String LIGHT_DECREASE = "light_decrease";
+
+        /**
+         * Light sensor hysteresis for decreasing backlight. The value is
+         * int (0-99) representing % (0-0.99 as float). Example:
+         *
+         * Levels     Output
+         * 0 - 100    50
+         * 100 - 200  100
+         * 200 - Inf  255
+         *
+         * Current sensor value is 150 which gives light value 100. Hysteresis is 50.
+         * Current level lower bound is 100 and previous lower bound is 0.
+         * Sensor value must drop below 100-(100-0)*(50/100)=50 for output to become 50
+         * (corresponding to the 0 - 100 level).
+         * @hide
+         */
+        public static final String LIGHT_HYSTERESIS = "light_hysteresis";
+
+        /**
+         * Whether light sensor used when calculating automatic backlight should
+         * be filtered through an moving average filter.
+         * The value is boolean (1 or 0).
+         *
+         * @hide
+         */
+        public static final String LIGHT_FILTER = "light_filter";
+
+        /**
+         * Window length of filter used when calculating automatic backlight.
+         * One minute means that the average sensor value last minute is used.
+         * The value is integer (milliseconds)
+         *
+         * @hide
+         */
+        public static final String LIGHT_FILTER_WINDOW = "light_filter_window";
+
+        /**
+         * Reset threshold of filter used when calculating automatic backlight.
+         * Sudden large jumps in sensor value resets the filter. This is used
+         * to make the filter respond quickly to large enough changes in input
+         * while still filtering small changes. Example:
+         *
+         * Current filter value (average) is 100 and sensor value is changing to
+         * 10, 150, 100, 30, 50. The filter is continously taking the average of
+         * the samples. Now the user goes outside and the value jumps over 1000.
+         * The difference between current average and new sample is larger than
+         * the reset threshold and filter is reset. It begins calculating a new
+         * average on samples around 1000 (say, 800, 1200, 1000, 1100 etc.)
+         *
+         * The value is integer (lux)
+         *
+         * @hide
+         */
+        public static final String LIGHT_FILTER_RESET = "light_filter_reset";
+
+        /**
+         * Sample interval of filter used when calculating automatic backlight.
+         * The value is integer (milliseconds)
+         *
+         * @hide
+         */
+        public static final String LIGHT_FILTER_INTERVAL = "light_filter_interval";
+
         /**
          * Control whether the process CPU usage meter should be shown.
          */