目前项目的屏幕触摸芯片使用的是gt911,想实现屏幕一段时间内没有触摸动作时屏幕可以自动息屏，进入sleep mode, 请问该如何实现，谢谢。

内核源码的源文件是这一版本

/*

* Goodix GT9xx touchscreen driver

*

* Copyright (C) 2010 - 2014 Goodix. Ltd.

*

* This program is free software; you can redistribute it and/or modify

* it under the terms of the GNU General Public License as published by

* the Free Software Foundation; either version 2 of the License, or

* (at your option) any later version.

*

* This program is distributed in the hope that it will be a reference

* to you, when you are integrating the GOODiX's CTP IC into your system,

* but WITHOUT ANY WARRANTY; without even the implied warranty of

* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU

* General Public License for more details.

*

* Version: 2.4

* Release Date: 2014/11/28

*/