test.c

周立功ARM7试验箱

#ifndef __KERNEL__
    #define __KERNEL__
#endif
#ifndef MODULE
    #define MODULE
#endif

#include <linux/module.h>
#include <linux/sched.h>
#include <linux/kernel.h>       /* printk() */
#include <linux/init.h>


static int test_open(struct inode *inode, struct file *filp);
static int test_release(struct inode *inode, struct file *filp); 
static int test_ioctl(struct inode *inode, struct file *filp, unsigned int cmd,
		    unsigned long param);
static int check_test_change(kdev_t dev);
static int test_revalidate(kdev_t dev);
int  test_init(void);
void test_cleanup(void);


#define MAJOR_NR 125
#define DEVICE_NAME "test"               /* name for messaging */
#define DEVICE_NR(device) MINOR(device)
#define DEVICE_NO_RANDOM
#define DEVICE_OFF(d)

module_init(test_init);
module_exit(test_cleanup);

#include <linux/blk.h>


/********************************************************************************************************/


static struct block_device_operations test_fops =        /* driver info  */
{
    owner:              THIS_MODULE,
    open:               test_open,
    release:            test_release,
    ioctl:              test_ioctl,
    check_media_change: check_test_change,
    revalidate:         test_revalidate,
};

        static int  test_open(struct inode *inode, struct file *filp)
{
    MOD_INC_USE_COUNT;
    return 0;          /* success */
} 

        static int  test_release(struct inode *inode, struct file *filp) 
{
    MOD_DEC_USE_COUNT;
    return(0); 
} 

        static int test_ioctl(struct inode *inode, struct file *filp, 
                    unsigned int cmd, unsigned long arg)
{
    return 0;
}

        static int check_test_change(kdev_t dev)
{
    return 0;
}

        static int test_revalidate(kdev_t dev)
{

    return 0;
}

        int  test_init(void)
{
    int  result;

    result = register_blkdev(MAJOR_NR,  DEVICE_NAME,  &test_fops); 
    if (result < 0)
    {
        printk(KERN_ERR DEVICE_NAME ": Unable to get major %d\n", MAJOR_NR );
        return(result); 
    } 

    printk(KERN_ERR DEVICE_NAME ": init OK\n");
    return(0); 
}

        void test_cleanup(void)
{
    unregister_blkdev(MAJOR_NR, DEVICE_NAME);
}

/*********************************************************************************************************
**                            End Of File
********************************************************************************************************/