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This commit is contained in:
Florian RICHER 2025-02-25 13:32:53 +01:00
parent 372b482212
commit d149cbe6a5
12 changed files with 974 additions and 132 deletions
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25
03_character_device/test_module.c
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@ -8,7 +8,7 @@
#define CLASS_NAME "chardrv"
static int major_number;
static char msg[256] = {0};
static char msg[256] = { 0 };
static short size_of_msg;
static int device_open(struct inode *, struct file *);
static int device_release(struct inode *, struct file *);
@ -22,33 +22,40 @@ static struct file_operations fops = {
.release = device_release,
};
static int __init basic_module_init(void) {
static int __init basic_module_init(void)
{
pr_info("Bonjour! Le module est chargé.\n");
major_number = register_chrdev(0, DEVICE_NAME, &fops);
if (major_number < 0) {
pr_info("Erreur lors de l'enregistrement du périphérique de caractère\n");
return major_number;
}
pr_info("Périphérique de caractère enregistré avec le numéro de majeur %d\n", major_number);
pr_info("Périphérique de caractère enregistré avec le numéro de majeur %d\n",
major_number);
return 0;
}
static void __exit basic_module_exit(void) {
static void __exit basic_module_exit(void)
{
unregister_chrdev(major_number, DEVICE_NAME);
pr_info("Au revoir! Le module est déchargé.\n");
}
static int device_open(struct inode *inode, struct file *file) {
static int device_open(struct inode *inode, struct file *file)
{
pr_info("flodev - Ouverture du périphérique\n");
return 0;
}
static int device_release(struct inode *inode, struct file *file) {
static int device_release(struct inode *inode, struct file *file)
{
pr_info("flodev - Fermeture du périphérique\n");
return 0;
}
static ssize_t device_read(struct file *filp, char *buffer, size_t length, loff_t *offset) {
static ssize_t device_read(struct file *filp, char *buffer, size_t length,
loff_t *offset)
{
int bytes_read = 0;
if (*offset >= size_of_msg) {
return 0;
@ -65,7 +72,9 @@ static ssize_t device_read(struct file *filp, char *buffer, size_t length, loff_
return bytes_read;
}
static ssize_t device_write(struct file *filp, const char *buff, size_t len, loff_t *off) {
static ssize_t device_write(struct file *filp, const char *buff, size_t len,
loff_t *off)
{
if (copy_from_user(msg, buff, len)) {
return -EFAULT;
}