高通DTS 配置 GPIO 中断

1. 映射键值
@ \device\qcom\msm8909\gpio-keys.kl
key 212   SOS

上层同事在 frameworks\base\core\java\android\view\KeyEvent.java 定义键值：
public static final int KEYCODE_SOS = 528; //( 0x210 )

2. 配置 GPIO dts

2.1 配置 中断键值 
@ \kernel\msm-3.18\arch\arm\boot\dts\qcom\msm8909-mtp.dtsi
搜索 gpio_keys 关键字：

gpio_keys {
		compatible = "gpio-keys";
		input-name = "gpio-keys";
		pinctrl-names = "tlmm_gpio_key_active","tlmm_gpio_key_suspend";
		pinctrl-0 = <&gpio_key_active>;
		pinctrl-1 = <&gpio_key_suspend>;

		new add 20190923 begin///
		key_sos {
			label = "key_sos";
			gpios = <&msm_gpio 90 0x1>;
			linux,input-type = <1>;
			linux,code = <0x212>;
			gpio-key,wakeup;
			debounce-interval = <15>;
		};
/*
		camera_focus {
			label = "camera_focus";
			gpios = <&msm_gpio 91 0x1>;
			linux,input-type = <1>;
			linux,code = <0x210>;
			gpio-key,wakeup;
			debounce-interval = <15>;
		};
*/
		new add 20190923 end///

		camera_snapshot {
			label = "camera_snapshot";
			gpios = <&msm_gpio 92 0x1>;
			linux,input-type = <1>;
			linux,code = <0x2fe>;
			gpio-key,wakeup;
			debounce-interval = <15>;
		};
	};



2.2 配置 gpio 为输入模式
@ \kernel\msm-3.18\arch\arm\boot\dts\qcom\msm8909-pinctrl.dtsi

搜索 gpio_keys 关键字，检查是还有 GPIO90，
下面代码，看起来 GPIO 90 已经配置成 输入模式了

		tlmm_gpio_key {
			gpio_key_active: gpio_key_active {
				mux {
					pins = "gpio90", "gpio91", "gpio92";
					function = "gpio";
				};

				config {
					pins = "gpio90", "gpio91", "gpio92";
					drive-strength = <2>;
					bias-pull-up;
				};
			};

			gpio_key_suspend: gpio_key_suspend {
				mux {
					pins = "gpio90", "gpio91", "gpio92";
					function = "gpio";
				};

				config {
					pins = "gpio90", "gpio91", "gpio92";
					drive-strength = <2>;
					bias-pull-up;
				};
			};
		};

修改完毕后，可以使用

adb shell getevent

然后按键，看对应的 事件是否正确