obj-m := zad4.o
KERNELDIR = /lib/modules/$(shell uname -r)/build

default:
    $(MAKE) -C $(KERNELDIR) M=$(PWD) modules

clean:
    $(MAKE) -C $(KERNELDIR) M=$(PWD) clean

zad4.c
#include<linux/module.h>
#include<linux/sysfs.h>
#include<linux/kobject.h>

static struct kobject kernel_object;
static int number;
static const char attribute_name[] = "number";

static ssize_t number_show(struct kobject *kernel_object, struct attribute *attribute, char *buffer)
{
        return sprintf(buffer,"%d\n",number);
}

static ssize_t number_store(struct kobject *kernel_object, struct attribute *attribute, const char *buffer, size_t count)
{
        sscanf(buffer,"%d",&number);
        return count;
}

static struct sysfs_ops operations = {
        .show = number_show,
        .store = number_store,
};

static void number_release(struct kobject *kernel_object)
{
        pr_notice("Release function activated!\n");
}

static struct attribute number_attribute = {
        .name = attribute_name,
        .mode = 0600
};

static struct attribute *attributes[] = {
        &number_attribute,
        NULL
};

static struct kobj_type ktype =
{
        .release = number_release,
        .sysfs_ops = &operations,
        .default_attrs = attributes,
};

static int __init sysfs_test_init(void)
{
        kobject_init(&kernel_object,&ktype);
        if(kobject_add(&kernel_object,&THIS_MODULE->mkobj.kobj,"test%d",2)) {
            pr_alert("Error adding a kobject\n");
            return -ENOMEM;
        }
        return 0;
}

static void __exit sysfs_test_exit(void)
{
        kobject_put(&kernel_object);
}

module_init(sysfs_test_init);
module_exit(sysfs_test_exit);
MODULE_DESCRIPTION("A second kernel module demonstrating the usage of sysfs.");
MODULE_LICENSE("GPL");


//zad5
#include<linux/module.h>
#include<linux/sysfs.h>
#include<linux/kobject.h>

static struct kobject kernel_object;
static int number;
static const char attribute_name[] = "number";

static ssize_t number_show(struct kobject *kernel_object, struct attribute *attribute, char *buffer)
{
        return sprintf(buffer,"%d\n",number);
}

static ssize_t number_store(struct kobject *kernel_object, struct attribute *attribute, const char *buffer, size_t count)
{
        sscanf(buffer,"%d",&number);
        return count;
}

static struct sysfs_ops operations = {
        .show = number_show,
        .store = number_store,
};

static void number_release(struct kobject *kernel_object)
{
        pr_notice("Release function activated!\n");
}

static struct attribute number_attribute = {
        .name = attribute_name,
        .mode = 0600
};

static struct attribute *attributes[] = {
        &number_attribute,
        NULL
};

static struct kobj_type ktype =
{
        .release = number_release,
        .sysfs_ops = &operations,
        .default_attrs = attributes,
};

static int __init sysfs_test_init(void)
{
        if(kobject_add(&kernel_object,NULL,"test%d",2))
                goto err;

        return 0;

err:
        pr_alert("Error adding a kobject\n");
        return -ENOMEM;
}

static void __exit sysfs_test_exit(void)
{
        kobject_put(&kernel_object);
}

module_init(sysfs_test_init);
module_exit(sysfs_test_exit);
MODULE_DESCRIPTION("A second kernel module demonstrating the usage of sysfs.");
MODULE_LICENSE("GPL");