Qualcomm MSM GPIO-KEY device tree

最新推荐文章于 2025-05-18 20:15:43 发布

molly_lin

最新推荐文章于 2025-05-18 20:15:43 发布

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分类专栏： Qualcomm 文章标签： Qualcomm

本文链接：https://blog.youkuaiyun.com/bolanlst/article/details/51385808

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本文介绍如何在Linux内核中配置GPIO按键驱动，包括添加GPIO按键设备到设备树、定义pin控制配置、检查GPIO按键节点等步骤。通过示例展示了如何为特定GPIO设置属性如标签、GPIO编号、输入类型、键值及唤醒功能。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

1、add gpio-keys.c to build
2、add gpio-keys device in your main dtsi like that:
&soc {
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_up {
label = "volume_up";//key label name
gpios = <&msm_gpio 107 0x1>;//gpio num
linux,input-type = <1>;//don't need modify that
linux,code = <115>;//the key value that you want to use
gpio-key,wakeup;//could wakeup system
debounce-interval = <15>;//the delay time for debounce
};
camera_focus {
label = "camera_focus";
gpios = <&msm_gpio 108 0x1>;
linux,input-type = <1>;
linux,code = <0x210>;
gpio-key,wakeup;
debounce-interval = <15>;
};

};
};
3、add pinctrl in pinctrl.dtsi
tlmm_gpio_key {
qcom,pins = <&gp 107>, <&gp 108>;
qcom,pin-func = <0>;
qcom,num-grp-pins = <2>;
label = "tlmm_gpio_key";
gpio_key_active: gpio_key_active {
drive-strength = <2>;
bias-pull-up;
};
gpio_key_suspend: gpio_key_suspend {
drive-strength = <2>;
bias-pull-up;
};
};
4、than check gpio-keys node.
/sys/devices/soc.0/gpio_keys.*
cat key
and getevent to look the event.