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| #include <linux/module.h>
#include <linux/init.h>
#include <linux/fs.h>
#include <asm/uaccess.h>
MODULE_AUTHOR("Jobe");
MODULE_DESCRIPTION("Driver minimaliste pour des tests");
MODULE_SUPPORTED_DEVICE("aucune");
MODULE_LICENSE("GPL");
#define DRIVER_NAME "ezDriver"
static int buf_size = 64;
static char *buffer;
//paramètre pour le numéro major
static int major = 254;
module_param(major, int, 0);
MODULE_PARM_DESC(major, "major number");
/***************************************************************************
Accès au drivers
***************************************************************************/
static ssize_t ezdriver_read(struct file *file, char *buf, size_t count, loff_t *ppos)
{
printk(KERN_DEBUG "ezdriver: read\n");
return 0;
}
static ssize_t ezdriver_write(struct file *file, const char *buf, size_t count, loff_t *ppos)
{
int ecrits = 0;
int i = 0;
printk(KERN_DEBUG "ezdriver: write\n");
printk(KERN_DEBUG "ezdriver: demande d'ecriture de %d octets \n", count);
//calcule la taille réellement écrit en fonction de la taille du buffer et de la position
if(count <= buf_size - (int)*ppos)
ecrits = count;
else
ecrits = buf_size - (int)*ppos;
if(ecrits)
copy_from_user((int*)buffer + (int)*ppos, buf, ecrits);
*ppos += ecrits;
printk(KERN_DEBUG "ezdriver: %d octets réellement écrits \n", ecrits);
printk(KERN_DEBUG "ezdriver: position=%d \n", (int)*ppos);
printk(KERN_DEBUG "ezdriver: contenu du buffer %s", buffer);
for(i=0;i<buf_size;i++)
printk(" %X", buffer[i]);
printk("\n");
return 0;
}
static ssize_t ezdriver_open(struct inode *inode, struct file *file)
{
printk(KERN_DEBUG "ezdriver: open\n");
buffer = kmalloc(64, GFP_KERNEL);
if(buffer == NULL)
{
printk(KERN_ERR "ezdriver: kmalloc a provoquer un erreur");
return -1;
}
return 0;
}
static ssize_t ezdriver_close(struct inode *inode, struct file *file)
{
printk(KERN_DEBUG "ezdriver: close\n");
kfree(buffer);
buffer = NULL;
return 0;
}
struct file_operations fops =
{
.read = ezdriver_read,
.write = ezdriver_write,
.open = ezdriver_open,
.release = ezdriver_close
};
/***************************************************************************
Initialisations du driver
***************************************************************************/
static int __init ezdriver_init(void)
{
if(register_chrdev(major, DRIVER_NAME, &fops) < 0)
printk(KERN_ERR "ezDriver: register_chrdev à provoquer un erreur\n");
else
printk(KERN_DEBUG "ezDriver: register_chrdev executé normallement\n");
return 0;
}
/***************************************************************************
Nettoyage du driver
***************************************************************************/
static void __exit ezdriver_cleanup(void)
{
if(unregister_chrdev(major, DRIVER_NAME) < 0)
printk(KERN_ERR "ezDriver: unregister_chrdev à provoquer un erreur\n");
else
printk(KERN_DEBUG "ezDriver: unregister_chrdev executé normallement\n");
}
module_init(ezdriver_init);
module_exit(ezdriver_cleanup); |
