RK3399 gpio 做系统按键

一.kernel\arch\arm64\boot\dts\rockchip\rk3399-android.dtsi

	rk_key: rockchip-key {
		compatible = "rockchip,key";
		status = "okay";

		//io-channels = <&saradc 0>;

		vol-up-key {
			linux,code = <115>;
			label = "volume up";
			rockchip,adc_value = <1>;
		};

		vol-down-key {
			linux,code = <114>;
			label = "volume down";
			rockchip,adc_value = <170>;
		};

		power-key {
			gpios = <&gpio0 5 GPIO_ACTIVE_LOW>;
			linux,code = <116>;
			label = "power";
			gpio-key,wakeup;
		};
		
		gpio1-key {
			gpios = <&gpio2 4 GPIO_ACTIVE_LOW>;
			linux,code = <131>;
			label = "gpio1 key";
			gpio-key,wakeup;
		};				
	};

二.frameworks\native\include\android\keycodes.h

    /** F1 key. */
    AKEYCODE_F1              = 131,
    /** F2 key. */
    AKEYCODE_F2              = 132,
    /** F3 key. */
    AKEYCODE_F3              = 133,

三.rk29-keypad.kl  加按键值

系统 优先加载  system\usr\keylayout\rk29-keypad.kl   

device\rockchip\common\rk29-keypad.kl

key 59    MENU
key 102   HOME
key 114   VOLUME_DOWN
key 115   VOLUME_UP
key 116   POWER
key 143   NOTIFICATION
key 158   BACK
key 212   CAMERA
key 217   SEARCH
key 131   F1
key 132   F2
key 133   F3　　

四.frameworks\base\services\core\java\com\android\server\policy\PhoneWindowManager.java 　

　　public long interceptKeyBeforeDispatching(WindowState win, KeyEvent event, int policyFlags) {

                else if(keyCode == 131){	
				if (!down) {
				  //Log.d("gatsby", "gpio1_key xh_flag-> " + xh_flag +" gpio1_key  num->"+gpio1_key);
				  if(xh_flag){
					 if(gpio1_key %2 !=0){
					 	  RootCommand("settings put system screen_brightness 255");
					 	  toastTest("Highlight mode!");				   		
					 }else {
					 	  RootCommand("settings put system screen_brightness 110");
					 	  toastTest("Normal brightness!");
					 }
				  }
					gpio1_key++;						
				}	
				return -1;
		}