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Add virtual led basic example

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Florian RICHER 2025-02-23 14:25:36 +01:00
parent 510a41cbb3
commit 52436b2045
Signed by: florian.richer
GPG key ID: C73D37CBED7BFC77
2 changed files with 50 additions and 0 deletions
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7
06_virtual_led_basic/Makefile Normal file
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obj-m += test_module.o
all:
make -C $(LINUX_MODULES_FOLDER)/build M=$(PWD) modules
clean:
make -C $(LINUX_MODULES_FOLDER)/build M=$(PWD) clean

43
06_virtual_led_basic/test_module.c Normal file
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#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/leds.h>
#include <linux/module.h>
static void virtual_led_set_brightness(struct led_classdev *led_cdev, enum led_brightness brightness) {
pr_info("Luminosité défini sur la LED %s à %d", led_cdev->name, brightness);
}
static struct led_classdev virtual_led = {
.name = "flo_led",
.brightness = 0,
.max_brightness = 255,
.brightness_set = virtual_led_set_brightness
};
static int __init virtual_led_init(void) {
int ret;
pr_info("Chargement du module pour la LED virtuelle");
ret = led_classdev_register(NULL, &virtual_led);
if (ret < 0) {
pr_err("Impossible d'ajouter la LED virtuelle");
return ret;
}
pr_info("La LED virtuelle est ajouté");
return 0;
}
static void __exit virtual_led_exit(void) {
pr_info("Déchargement du module pour la LED virtuelle");
led_classdev_unregister(&virtual_led);
pr_info("La LED virtuelle est bien retiré");
}
module_init(virtual_led_init);
module_exit(virtual_led_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Florian RICHER");
MODULE_DESCRIPTION("Un module noyau qui ajoute une LED virtuelle");
MODULE_VERSION("1.0");