sysfs_create_group

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/sysfs.h>

static ssize_t my_attribute_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) {
    return sprintf(buf, "%s\n", "Hello, Sysfs!");
}

static ssize_t my_attribute_store(struct kobject *kobj, struct kobj_attribute *attr, const char *buf, size_t count) {
    printk(KERN_INFO "Received: %s\n", buf);
    return count;
}

static struct kobj_attribute my_attribute = __ATTR(my_attr, S_IRUGO | S_IWUSR, my_attribute_show, my_attribute_store);

static struct attribute *my_attrs[] = {
    &my_attribute.attr,
    NULL,
};

static struct attribute_group my_attr_group = {
    .attrs = my_attrs,
};

static int __init my_module_init(void) {
    struct kobject *kobj;

    kobj = kobject_create_and_add("my_module", kernel_kobj);
    if (!kobj)
        return -ENOMEM;

    if (sysfs_create_group(kobj, &my_attr_group)) {
        kobject_put(kobj);
        return -EIO;
    }

    return 0;
}

static void __exit my_module_exit(void) {
    struct kobject *kobj;

    kobj = kobject_find_and_destroy("my_module");
    if (kobj)
        kobject_put(kobj);
}

module_init(my_module_init);
module_exit(my_module_exit);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Your Name");
MODULE_DESCRIPTION("A simple sysfs example module");