高通平台通过gpio-keys添加按键到input系统

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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;};};};