《内核kernel：简单字符设备驱动模块编写》

一，模块编写

// simple_char.c
#include 
#include 
#include 
#include 
#include 

#define DEMO_NAME "my_demo_dev"
static dev_t dev;
static struct cdev *demo_cdev;
static signed count = 1;

static int demodrv_open(struct inode *inode, struct file *file)
{
	int major = MAJOR(inode->i_rdev);
	int minor = MINOR(inode->i_rdev);

	printk("%s: major=%d, minor=%d\n", __func__, major, minor);

	return 0;
}

static int demodrv_release(struct inode *inode, struct file *file)
{
	return 0;
}

static ssize_t
demodrv_read(struct file *file, char __user *buf, size_t lbuf, loff_t *ppos)
{
	printk("%s enter\n", __func__);
	return 0;
}

static ssize_t
demodrv_write(struct file *file, const char __user *buf, size_t count, loff_t *f_pos)
{
	printk("%s enter\n", __func__);
	return 0;

}

static const