linux led平台驱动

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/gpio.h>
#include <linux/platform_device.h>

static struct platform_device *led_dev;

static int led_probe(struct platform_device *pdev) {
    int ret;
    struct resource *res;

    res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
    if (!res) {
        dev_err(&pdev->dev, "No memory resource\n");
        return -ENODEV;
    }

    // 假设LED连接到GPIO 17
    ret = gpio_request(17, "led_gpio");
    if (ret) {
        dev_err(&pdev->dev, "Failed to request GPIO %d\n", 17);
        return ret;
    }

    gpio_direction_output(17, 0); // 初始状态为关闭

    return 0;
}

static int led_remove(struct platform_device *pdev) {
    gpio_free(17);
    return 0;
}

static const struct of_device_id led_of_match[] = {
    { .compatible = "example,led-device", },
    { /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, led_of_match);

static struct platform_driver led_driver = {
    .probe      = led_probe,
    .remove     = led_remove,
    .driver     = {
        .name   = "led_device",
        .of_match_table = led_of_match,
    },
};

module_platform_driver(led_driver);

MODULE_AUTHOR("Your Name");
MODULE_DESCRIPTION("A simple LED driver");
MODULE_LICENSE("GPL");