Linux驱动框架

#include
#include
#include
#include
#include
#include
#include
#include
#include
#include

static struct class *firstdrv_class;
static struct class_device    *firstdrv_class_dev;

static int first_drv_open(struct inode *inode, struct file *file)
{
    printk("first_drv_open\n");
    return 0;
}

static ssize_t first_drv_write(struct file *file, const char __user *buf, size_t count, loff_t * ppos)
{

    printk("first_drv_write\n");
    return 0;
}

static struct file_operations first_drv_fops = {
    .owner  =   THIS_MODULE,    /* 这是一个宏，推向编译模块时自动创建的__this_module变量 */
    .open   =   first_drv_open,     
    .write    =    first_drv_write,       
};

int major;
static int first_drv_init(void)
{
    major = register_chrdev(0, "first_drv", &first_drv_fops); // 注册驱动, 告诉内核

    firstdrv_class = class_create(THIS_MODULE, "firstdrv");//创建class

    firstdrv_class_dev = class_device_create(firstdrv_class, NULL, MKDEV(major, 0), NULL, "xyz"); /* 创建/dev/xyz设备节点 */

    return 0;
}

static void first_drv_exit(void)
{
    unregister_chrdev(major, "first_drv"); // 卸载

    class_device_unregister(firstdrv_class_dev);
    class_destroy(firstdrv_class);
}

module_init(first_drv_init);
module_exit(first_drv_exit);

MODULE_LICENSE("GPL");