这两天在研究rk3399跑Android7.1.2系统，自己添加HOME和返回键。
研究linux或者Android驱动移植一直秉承自下向上的研究
首先硬件，Android7.1.2HOME和返回键已经可以脱离实体硬件，用虚拟按键充当了。
设备树目录 Android_Src_Path/kernel/arch/arm64/boot/dts/rockchip/
rk3399-android.dtsi中定义了HOME,BACK等按键。可以看到power键是实体按键，HOME，返回，MENU键没有实体按键。
/*rk3399-android.dtsi文件部分内容*/
rk_key: rockchip-key {
compatible = "rockchip,key";
status = "okay";
io-channels = <&saradc 1>;
vol-up-key {
linux,code = <113>;
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;
};
menu-key {
linux,code = <59>;
label = "menu";
rockchip,adc_value = <746>;
};
home-key {
linux,code = <102>;
label = "home";
rockchip,adc_value = <355>;
};
back-key {
linux,code = <158>;
label = "back";
rockchip,adc_value = <560>;
};
camera-key {
linux,code = <212>;
label = "camera";
rockchip,adc_value = <450>;
};
};
这两天在研究rk3399跑Android7.1.2系统，自己添加HOME和返回键。
研究linux或者Android驱动移植一直秉承自下向上的研究
首先硬件，Android7.1.2HOME和返回键已经可以脱离实体硬件，用虚拟按键充当了。
设备树目录 Android_Src_Path/kernel/arch/arm64/boot/dts/rockchip/
rk3399-android.dtsi中定义了HOME,BACK等按键。可以看到power键是实体按键，HOME，返回，MENU键没有实体按键。
/*rk3399-android.dtsi文件部分内容*/
rk_key: rockchip-key {
compatible = "rockchip,key";
status = "okay";
io-channels = <&saradc 1>;
vol-up-key {
linux,code = <113>;
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;
};
menu-key {
linux,code = <59>;
label = "menu";
rockchip,adc_value = <746>;
};
home-key {
linux,code = <102>;
label = "home";
rockchip,adc_value = <355>;
};
back-key {
linux,code = <158>;
label = "back";
rockchip,adc_value = <560>;
};
camera-key {
linux,code = <212>;
label = "camera";
rockchip,adc_value = <450>;
};
};
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