高通平台通过gpio-keys添加按键到input系统

版权声明：转载请注明，谢谢。 https://blog.csdn.net/u012899335/article/details/82048129

添加新的按键到input系统，可以直接使用gpio-keys，gpio-keys驱动相关代码已实现，我们只需通过简单配置就可以实现该功能。

dtsi添加

找到gpio_keys,在里面添加对应的按键，如下talkback_sq, 主要需要配置的有如下几项

gpios，对应原理图中的引脚

linux,input-type，上报事件的类型，我们这里选择1（EV_KEY）按键事件，定义在input-event-codes.h

linux,code,上报的事件的code

	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>;

		vol_down {
			label = "vol_down";
			gpios = <&msm_gpio 91 0x1>;
			linux,input-type = <1>;
			linux,code = <114>;
			gpio-key,wakeup;
			debounce-interval = <15>;
		};
        talkback_sq {
			label = "talkback_sq";
			gpios = <&msm_gpio 28 0x1>;
			linux,input-type = <1>;
			linux,code = <188>;
			gpio-key,wakeup;
			debounce-interval = <15>;
		};
	};

pinctrl添加

将对应的gpio添加到gpio_key

		tlmm_gpio_key {
			gpio_key_active: gpio_key_active {
				mux {
					pins = "gpio90", "gpio91", "gpio92", "gpio95"/*, "gpio28"*/;
					function = "gpio";
				};

				config {
					pins = "gpio90", "gpio91", "gpio92", "gpio95"/*, "gpio28"*/;
					drive-strength = <2>;
					bias-pull-up;
				};
			};

			gpio_key_suspend: gpio_key_suspend {
				mux {
					pins = "gpio90", "gpio91", "gpio92", "gpio95"/*, "gpio28"*/;
					function = "gpio";
				};

				config {
					pins = "gpio90", "gpio91", "gpio92", "gpio95"/*, "gpio28"*/;
					drive-strength = <2>;
					bias-pull-up;
				};
			};
		};

配置kl文件

编辑gpio-keys.kl