leds_class創建過程

 本文記錄leds_class的創建過程：

 

1.
static int __init leds_init(void)
{
	leds_class = class_create(THIS_MODULE, "leds");
        
        ...
}

2.
/**
 * class_create - create a struct class structure
 * @owner: pointer to the module that is to "own" this struct class
 * @name: pointer to a string for the name of this class.
 *
 * This is used to create a struct class pointer that can then be used
 * in calls to class_device_create().
 *
 * Note, the pointer created here is to be destroyed when finished by
 * making a call to class_destroy().
 */
struct class *class_create(struct module *owner, const char *name)
{
	struct class *cls;
	...

	cls = kzalloc(sizeof(*cls), GFP_KERNEL);
	...

	cls->name = name;
	cls->owner = owner;
	cls->class_release = class_create_release;
	cls->release = class_device_create_release;

	retval = class_register(cls);
	...

	return cls;
        ...
}

3.
int class_register(struct class * cls)
{
	...

	error = kobject_set_name(&cls->subsys.kobj, "%s", cls->name);
	...

	subsys_set_kset(cls, class_subsys);

	error = subsystem_register(&cls->subsys);
	...

	return error;
}

---

 leds_class指針及class_subsys之間的關聯示意：