- 节点定义:gpio-keys-polled节点定义了一组轮询方式的GPIO按键。gpio-keys-polled是gpio-button-hotplug库可识别的关键字。这里就相当于告诉gpio-keys-polled,这是一组GPIO按键,它们的检测方式是轮询。 - 兼容性声明:compatible = "gpio-keys-polled"声明了这些按键与GPIO按键轮询驱动的兼容性。 - 轮询间隔:poll...
Hi, after upgrading my APU2 from Debian 10 (Kernel 4.19) to Debian 11 (Kernel 5.10) I'm getting a couple of these error messages at boot time: kernel: gpio-keys-polled gpio-keys-polled: unable to claim gpio 0, err=-517 I'm also noticing ...
ledtrig-gpio:drivers/leds/trigger/ledtrig-gpio.c提供LED触发器,即LED会在GPIO线高低电平变化时打开/关闭(该LED可能会使用上述的leds-gpio)。 gpio-keys:drivers/input/keyboard/gpio_keys.c用于处理GPIO线产生的中断,例如按键事件,同时支持去抖动。 gpio-keys-polled:drivers/input/keyboard/gpio_keys_polled.c用...
ledtrig-gpio:drivers/leds/trigger/ledtrig-gpio.c提供LED触发器,即LED会在GPIO线高低电平变化时打开/关闭(该LED可能会使用上述的leds-gpio)。 gpio-keys:drivers/input/keyboard/gpio_keys.c用于处理GPIO线产生的中断,例如按键事件,同时支持去抖动。 gpio-keys-polled:drivers/input/keyboard/gpio_keys_polled.c用...
1>首先来查看驱动源码,在/mnt/workspace/osrc-lab/source/drivers/input/keyboard/gpio_keys_polled.c,我们可以看到驱动的源码并不大,大家可以自己仔细阅读,对开发驱动会有很大的好处。 2> 在这个驱动源码里我们可以看到设备树的驱动就是根据“gpio-keys-polled“进行匹配的,当我们设备树里的compatible对应的名字和驱动...
实现了KEY device的注册。此函数调用后,会创建platform类型的设备,并和gpio-keys-polled驱动(gpio-button-hotplug.c )实现了绑定。 B. 当按键时,则触发button_hotplug_event函数(gpio-button-hotplug.c):调用button_hotplug_create_event产生uevent事件,调用button_hotplug_fill_even填充事件(JSON格式),并最终调用butto...
gpio-keys-polled { compatible = "gpio-keys-polled"; #address-cells = <1>; #size-cells = <0>; poll-interval = <20>; reset { label = "reset"; gpios = <&gpio0 5 1>; linux,code = <0x198>; }; }; root@OpenWrt:/sys/class/leds# ls ...
gpio-keys-polled { compatible = "gpio-keys-polled"; #address-cells = <1>; #size-cells = <0>; poll-interval = <20>; reset { label = "reset"; gpios = <&gpio0 5 1>; linux,code = <KEY_RESTART>; }; }; 按键驱动文件 package/kernel/gpio-button-hotplug/src/gpio-button-hotplug....
+ gpio-keys-polled { + compatible = "gpio-keys-polled"; + #address-cells = <1>; + #size-cells = <0>; + poll-interval = <20>; + reset { + label = "reset"; + gpios = <&gpio0 1 1>; + linux,code = <0x198>;
实现了KEY device的注册。此函数调用后,会创建platform类型的设备,并和gpio-keys-polled驱动(gpio-button-hotplug.c )实现了绑定。 B. 当按键时,则触发button_hotplug_event函数(gpio-button-hotplug.c):调用button_hotplug_create_event产生uevent事件,调用button_hotplug_fill_even填充事件(JSON格式),并最终调用butto...