按键灯待机2秒后灭掉

修改文件：/device/mediatek/mt6580/init.mt6580.rc

     chown system system /sys/class/leds/red/trigger
     chown system system /sys/class/leds/green/trigger
     chown system system /sys/class/leds/blue/trigger
+    
+    chown system system sys/devices/platform/device_info/KEY_LCD
+    chmod 0666 sys/devices/platform/device_info/KEY_LCD
 
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修改文件：/device/mediatek/sepolicy/basic/non_plat/system_server.te

 allow system_server device:chr_file { write read open getattr };
+
+allow system_server sysfs:file rw_file_perms;
+allow system_server xc_device_info:file rw_file_perms;
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修改文件：/frameworks/base/services/core/java/com/android/server/policy/PhoneWindowManager.java

     private static final int MSG_BBL_TIMEOUT = 27;

+    private static final int STOP_KEYBOARDLIGHT = 42;
+    private final static String KEYBOARD_LIGHT_FILE_PATH="/sys/devices/platform/device_info/KEY_LCD";

+
+
     private class PolicyHandler extends Handler {
         @Override
         public void handleMessage(Message msg) {
@@ -810,6 +816,13 @@
                     setButtonLightEnabled(false);
                     break;
+
+
+                case STOP_KEYBOARDLIGHT:
+                    write(KEYBOARD_LIGHT_FILE_PATH, 0);
+                    break;
+              
             }
         }
     }
@@ -3808,6 +3821,21 @@
         final boolean down = event.getAction() == KeyEvent.ACTION_DOWN;
         final boolean canceled = event.isCanceled();
         final int keyCode = event.getKeyCode();
+        
+        if (isScreenOn()){
+            write(KEYBOARD_LIGHT_FILE_PATH, 1);
+            if(mHandler!=null){
+                mHandler.removeMessages(STOP_KEYBOARDLIGHT);
+                mHandler.sendEmptyMessageDelayed(STOP_KEYBOARDLIGHT, 2000);//修改点
+
+            }
+        }

+
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修改文件：/basic/non_plat/file_contexts

 /sys/devices/platform/device_info/CHARGER_ENABLE u:object_r:xc_sysfs:s0

+/sys/devices/platform/device_info/KEY_LCD u:object_r:xc_device_info:s0
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