01_basicLinux内核模块-CSDN博客文章浏览阅读45次。环境ID=ubuntuMakefilemodules:clean:basic.creturn 0;运行效果。https://blog.csdn.net/m0_37132481/article/details/136157384?csdn_share_tail=%7B%22type%22%3A%22blog%22%2C%22rType%22%3A%22article%22%2C%22rId%22%3A%22136157384%22%2C%22source%22%3A%22m0_37132481%22%7D

device_bus_driver.c

root@T:/media/sf_D_DRIVE/kmodule/04_device_bus_driver# cat device_bus_driver.c
#include <linux/module.h>
#include <linux/device.h>
#include <linux/slab.h>

#define TAG "HELLO# "

struct device *dev = NULL;
struct device_driver *drv = NULL;

static int my_bus_match(struct device *_dev, struct device_driver *_drv)
{
        printk(TAG "%s called\n", __func__);
        return !strcmp(dev_name(dev), drv->name);
}

static int my_bus_probe(struct device *dev)
{
        printk(TAG "%s called\n", __func__);
        printk(TAG "hello drv_%s, dev_%s, Happy Marriage!\n", dev->driver->name, dev_name(dev));
        return 0;
}

static void my_bus_remove(struct device *dev)
{
        printk(TAG "%s called\n", __func__);
}

struct bus_type my_bus_type = {
        .name           = "my-bus",
        .match          = my_bus_match,
        .probe          = my_bus_probe,
        .remove         = my_bus_remove,
};

static int device_bus_driver_init(void)
{
        printk(TAG "%s called\n", __func__);

        /* register bus */
        bus_register(&my_bus_type);

        /* register device */
        dev = kzalloc(sizeof(*dev), GFP_KERNEL);
        dev->init_name = "hello";
        dev->bus = &my_bus_type;
        device_register(dev);
        dev = get_device(dev);

        /* register driver */
        drv = kzalloc(sizeof(*drv), GFP_KERNEL);
        drv->name = "hello";
        drv->bus = &my_bus_type;
        driver_register(drv);

        return 0;
}
static void device_bus_driver_exit(void)
{
        printk(TAG "%s called\n", __func__);
        /* unregister driver */
        driver_unregister(drv);
        /* unregister device */
        device_unregister(dev);
        /* unregister bus */
        bus_unregister(&my_bus_type);
        /* free resource */
        kfree(dev);
        kfree(drv);
}

module_init(device_bus_driver_init);
module_exit(device_bus_driver_exit);
MODULE_LICENSE("GPL");

效果