};staticint__initgpio_keys_init(void){returnplatform_driver_register(&gpio_keys_device_driver); } 当发现有设备匹配时(compatible = "gpio-keys"),执行gpio_keys_probe函数。 适配 在适配的时候,就会用到下面的对象。 structgpio_keys_button_data{structgpio_desc*gpiod;intlast_state;intcount;intthresho...
`-- value--对于输出GPIO,0/1表示输出高低电平;对于输入GPIO,0/1表示读取到的引脚电平。 对于每个GPIO Controller信息和控制节点如下: /sys/devices/platform/soc/soc:pin-controller@50002000|-- driver -> ../../../../bus/platform/drivers/stm32mp157-pinctrl--Pin Controller对应的驱动。|--driver_over...
首先,确保内核配置中已启用gpio-keys支持: ``` CONFIG_INPUT_GPIO_KEYS=y ``` 然后,通过设备树(DTS)文件描述GPIO键盘驱动: ```yaml gpio-keys { compatible = "gpio-keys"; pinctrl-names = "default"; pinctrl-0 = <&gpio_key_pins>; #address-cells= <1>; #size-cells = <0>; button@0 { la...
正点原子的imx6ull开发板,同样使用了gpio_keys.c驱动代码,实现GPIO模拟按键,观察其设备树,可以得知,正点原子使用了gpios属性,来描述管脚信息。如果做下述修改,我们可以使用中断形式触发按键,gpio_keys.c驱动代码同样支持中断形式触发按键。 gpio_keys: gpio_keys@0 { compatible = "gpio-keys"; pinctrl-names = "d...
一、gpio 与 pinctrl 本文主要关注 gpio 子系统,但是老吴认为必要先说明一下 pinctrl 子系统和 gpio 子系统的之间关系。 pinctrl 的作用: 引脚复用,例如某个引脚即可用作为普通的gpio,也可以作为UART的TX; 引脚配置,一般包括上下拉、驱动能力等; 点击查看大图 ...
pinctrl-0 = 2.匹配驱动: vi drivers/input/keyboard/gpio_keys.c: 首先init进去会根据名字匹配这个驱动 static int __init gpio_keys_init(void) { return platform_driver_register(&gpio_keys_device_driver); } static struct platform_driver gpio_keys_device_driver = { ...
gpio-keys { compatible = "gpio-keys"; pinctrl-names = "default"; user1 { label = "User1 Button"; gpios = <&gpio5 1 GPIO_ACTIVE_LOW>; gpio-key,wakeup; linux,code = <KEY_1>; }; user2 { label = "User2 Button"; gpios = <&gpio4 14 GPIO_ACTIVE_LOW>; ...
gpio-keys { compatible = "gpio-keys"; #address-cells = <1>; #size-cells = <0>; autorepeat; //pinctrl-names = "default"; //pinctrl-0 = <&pwrbtn>; button@0 { gpios = <&pio 49 IRQ_TYPE_EDGE_BOTH>; linux,code = <KEY_F13>; ...
&pinctrl{state_default:pinctrl0{gpio{ralink,group="i2c","gpio","jtag","i2s","spi cs1","uart2","pwm0","pwm1","sdmode","spis";ralink,function="gpio";};}; 与dts文件对应的引脚复用定义在source-17.01.4/build_dir/target-mipsel_24kc_musl-1.1.16/linux-ramips_mt7628/linux-4.4.92/arch...
gpio_keys { compatible = "gpio-keys";#address-cells = <1>;#size-cells = <0>;autorepeat;but...