Android 4.4 如何添加按键流程

代码路径：
frameworks/base/data/keyboards/Generic.kl
frameworks/base/data/keyboards/qwerty.kl
/device/sprd/sharkle/common/rootdir/system/usr/keylayout/gpio-keys.kl
frameworks/native/include/input/KeycodeLabels.h
frameworks/native/include/android/keycodes.h
frameworks/base/core/java/android/view/KeyEvent.java
frameworks/base/core/res/res/values/attrs.xml
frameworks/base/policy/src/com/android/internal/policy/impl/PhoneWindowManager.java
kernel/arch/arm/boot/dts/sp9820e-1h10-native.dts
在内核设备数sp9820e-1h10-native.dts文件中定义了驱动里面的值

gpio_keys {
compatible = “gpio-keys”;
input-name = “sprd-gpio-keys”;
status = “ok”;

	key_power {
		label = "Power Key";
		linux,code = <116>;
		gpios = <&pmic_eic 1 1>;
		debounce-interval = <5>;
		gpio-key,wakeup;
		gpio-key,level-trigger;
	};
	key_next {
		label = "next Key";
		linux,code = <301>;
		gpios = <&ap_gpio 124 1>;
		gpio-key,wakeup;
	};
    key_ok {
		label = "ok Key";
		linux,code = <302>;
		gpios = <&ap_gpio 125 1>;
		gpio-key,wakeup;
	};
};

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