2024-07-09 Linux 使用gpio-keyboard标准方式获取按键事件实例代码

一、kernel dts 配置修改：

diff --git a/sysdrv/source/kernel/arch/arm/boot/dts/rv1106g-evb1-v11.dts b/sysdrv/source/kernel/arch/arm/boot/dts/rv1106g-evb1-v11.dts
index d0d059a3b..584f3a00a 100755
--- a/sysdrv/source/kernel/arch/arm/boot/dts/rv1106g-evb1-v11.dts
+++ b/sysdrv/source/kernel/arch/arm/boot/dts/rv1106g-evb1-v11.dts
@@ -11,7 +11,19 @@
 	model = "Rockchip RV1106G EVB1 V11 Board";
 	compatible = "rockchip,rv1106g-evb1-v11", "rockchip,rv1106";
 
-	
+	gpio-keys {
+        compatible = "gpio-keys";
+        pinctrl-names = "default";
+        pinctrl-0 = <&pinctrl_gpio_keys>;
+
+        button@1 {
+            label = "KEY1";
+            linux,code = <KEY_ENTER>;
+            gpios = <&gpio1 RK_PD3 GPIO_ACTIVE_LOW>;
+        };
+
+    };
+    
 	leds {
 		compatible = "gpio-leds";
         led_green {
@@ -52,6 +64,12 @@
 
 &pinctrl {
 
+	pinctrl_gpio_keys {
+		pinctrl_gpio_keys: pinctrl-gpio-keys {
+			rockchip,pins = <1 RK_PD3 RK_FUNC_GPIO &pcfg_pull_up>;
+		};
+	};
+	
 	led_green_gpio {
 		led_green_gpio: led-green-gpio {
 			rockchip,pins = <1 RK_PC4 RK_FUNC_GPIO &pcfg_pull_up>;
diff --git a/sysdrv/source/kernel/arch/arm/configs/rv1106-evb.config b/sysdrv/source/kernel/arch/arm/configs/rv1106-evb.config
index f7ba90247..dbb2ae82d 100755
--- a/sysdrv/source/kernel/arch/arm/configs/rv1106-evb.config
+++ b/sysdrv/source/kernel/arch/arm/configs/rv1106-evb.config
@@ -51,6 +51,7 @@ CONFIG_WIRELESS=y
 CONFIG_WLAN=y
 CONFIG_AIC_WLAN_SUPPORT=y
 CONFIG_AIC8800_WLAN_SUPPORT=m
+CONFIG_KEYBOARD_GPIO=y
 # CONFIG_6LOWPAN is not set
 # CONFIG_AD2S1200 is not set
 # CONFIG_AD2S1210 is not set
@@ -508,7 +509,6 @@ CONFIG_KEYBOARD_ADC=y
 # CONFIG_KEYBOARD_BCM is not set
 # CONFIG_KEYBOARD_CAP11XX is not set
 # CONFIG_KEYBOARD_DLINK_DIR685 is not set
-# CONFIG_KEYBOARD_GPIO is not set
 # CONFIG_KEYBOARD_GPIO_POLLED is not set
 # CONFIG_KEYBOARD_LKKBD is not set
 # CONFIG_KEYBOARD_LM8333 is not set

二、测试代码

#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h>
#include <unistd.h>
#include <errno.h>
#include <sys/time.h>
#include <sys/types.h>
#include <linux/input.h>

#define DEVICE "/dev/input/event0" // 替换X为实际的设备编号

void handle_key_event(int fd) {
    struct input_event ev;
    if (read(fd, &ev, sizeof(struct input_event)) != sizeof(struct input_event)) {
        perror("Error reading from input device");
        return;
    }

    if (ev.type == EV_KEY) {
        printf("Key code:%d has been %s\n", ev.code,ev.value == 1 ? "pressed" : "released");
    }
}

int main() {
    int fd, ret;
    fd_set readfds;
    struct timeval timeout;

    // 打开输入设备
    fd = open(DEVICE, O_RDONLY | O_NONBLOCK);
    if (fd < 0) {
        perror("Cannot open input device");
        return 1;
    }

    printf("Waiting for key events on %s (press Ctrl+C to exit) KEY_ENTER=%d\n", DEVICE,KEY_ENTER);

    while (1) {
        FD_ZERO(&readfds);
        FD_SET(fd, &readfds);

        // 设置超时时间，这里设置为5秒
        timeout.tv_sec = 5;
        timeout.tv_usec = 0;

        // 等待按键事件
        ret = select(fd + 1, &readfds, NULL, NULL, &timeout);

        if (ret == -1) {
            perror("Select failed");
            break;
        } else if (ret == 0) {
            printf("Select timed out!\n");
            continue;
        }

        if (FD_ISSET(fd, &readfds)) {
            handle_key_event(fd);
        }
    }

    close(fd);
    return 0;
}

三、查看/proc/bus/input/devices设备