add device class

1 files changed, 26 insertions, 3 deletions

diff --git a/driver/main.c b/driver/main.c
index 76ba1d8..8775727 100644
--- a/driver/main.c
+++ b/driver/main.c
@@ -21,14 +21,37 @@ struct platform_driver lork_driver = {
 	}
 };
 
+struct class* class;
+
 static int mod_init(void) {
-	printk("%s()\n", __PRETTY_FUNCTION__);
-	return platform_driver_register(&lork_driver);
+	int err;
+
+	// create /sys/class/lork
+	class = class_create("lork");
+	if (IS_ERR_OR_NULL(class)) {
+		err = PTR_ERR(class);
+		printk(KERN_ERR "class_create error %d\n", err);
+		goto free_class;
+	}
+
+	// create platform driver
+	err = platform_driver_register(&lork_driver);
+	if (err) goto return_err;
+
+	printk("%s() OK\n", __PRETTY_FUNCTION__);
+	return 0;
+
+free_class:
+	class_destroy(class);
+return_err:
+	printk("%s() -> %d\n", __PRETTY_FUNCTION__, err);
+	return err;
 }
 
 static void mod_exit(void) {
-	printk("%s()\n", __PRETTY_FUNCTION__);
 	platform_driver_unregister(&lork_driver);
+	class_destroy(class);
+	printk("%s()\n", __PRETTY_FUNCTION__);
 }
 
 module_init(mod_init);