3  * class.c - basic device class management
11 #include <linux/device/class.h>
33 		ret = class_attr->show(cp->class, class_attr, buf);  in class_attr_show()
45 		ret = class_attr->store(cp->class, class_attr, buf, count);  in class_attr_store()
52 	struct class *class = cp->class;  in class_release()  local
54 	pr_debug("class '%s': release.\n", class->name);  in class_release()
56 	if (class->class_release)  in class_release()
57 		class->class_release(class);  in class_release()
59 		pr_debug("class '%s' does not have a release() function, "  in class_release()
60 			 "be careful\n", class->name);  in class_release()
68 	struct class *class = cp->class;  in class_child_ns_type()  local
70 	return class->ns_type;  in class_child_ns_type()
84 /* Hotplug events for classes go to the class subsys */
88 int class_create_file_ns(struct class *cls, const struct class_attribute *attr,  in class_create_file_ns()
101 void class_remove_file_ns(struct class *cls, const struct class_attribute *attr,  in class_remove_file_ns()
108 static struct class *class_get(struct class *cls)  in class_get()
115 static void class_put(struct class *cls)  in class_put()
141 static int class_add_groups(struct class *cls,  in class_add_groups()
147 static void class_remove_groups(struct class *cls,  in class_remove_groups()
153 int __class_register(struct class *cls, struct lock_class_key *key)  in __class_register()
158 	pr_debug("device class '%s': registering\n", cls->name);  in __class_register()
173 	/* set the default /sys/dev directory for devices of this class */  in __class_register()
178 	/* let the block class directory show up in the root of sysfs */  in __class_register()
185 	cp->class = cls;  in __class_register()
199 void class_unregister(struct class *cls)  in class_unregister()
201 	pr_debug("device class '%s': unregistering\n", cls->name);  in class_unregister()
206 static void class_create_release(struct class *cls)  in class_create_release()
213  * __class_create - create a struct class structure
214  * @owner: pointer to the module that is to "own" this struct class
215  * @name: pointer to a string for the name of this class.
216  * @key: the lock_class_key for this class; used by mutex lock debugging
218  * This is used to create a struct class pointer that can then be used
221  * Returns &struct class pointer on success, or ERR_PTR() on error.
226 struct class *__class_create(struct module *owner, const char *name,  in __class_create()
229 	struct class *cls;  in __class_create()
255  * class_destroy - destroys a struct class structure
256  * @cls: pointer to the struct class that is to be destroyed
261 void class_destroy(struct class *cls)  in class_destroy()
270  * class_dev_iter_init - initialize class device iterator
271  * @iter: class iterator to initialize
272  * @class: the class we wanna iterate over
276  * Initialize class iterator @iter such that it iterates over devices
277  * of @class.  If @start is set, the list iteration will start there,
281 void class_dev_iter_init(struct class_dev_iter *iter, struct class *class,  in class_dev_iter_init()  argument
288 	klist_iter_init_node(&class->p->klist_devices, &iter->ki, start_knode);  in class_dev_iter_init()
295  * @iter: class iterator to proceed
303  * calling back into class code.
323  * @iter: class iterator to finish
336  * @class: the class we're iterating
341  * Iterate over @class's list of devices, and call @fn for each,
349  * @fn is allowed to do anything including calling back into class
352 int class_for_each_device(struct class *class, struct device *start,  in class_for_each_device()  argument
359 	if (!class)  in class_for_each_device()
361 	if (!class->p) {  in class_for_each_device()
362 		WARN(1, "%s called for class '%s' before it was initialized",  in class_for_each_device()
363 		     __func__, class->name);  in class_for_each_device()
367 	class_dev_iter_init(&iter, class, start, NULL);  in class_for_each_device()
381  * @class: the class we're iterating
396  * @match is allowed to do anything including calling back into class
399 struct device *class_find_device(struct class *class, struct device *start,  in class_find_device()  argument
406 	if (!class)  in class_find_device()
408 	if (!class->p) {  in class_find_device()
409 		WARN(1, "%s called for class '%s' before it was initialized",  in class_find_device()
410 		     __func__, class->name);  in class_find_device()
414 	class_dev_iter_init(&iter, class, start, NULL);  in class_find_device()
429 	struct class *parent;  in class_interface_register()
433 	if (!class_intf || !class_intf->class)  in class_interface_register()
436 	parent = class_get(class_intf->class);  in class_interface_register()
455 	struct class *parent = class_intf->class;  in class_interface_unregister()
475 ssize_t show_class_attr_string(struct class *class,  in show_class_attr_string()  argument
491  * class_compat_register - register a compatibility class
492  * @name: the name of the class
494  * Compatibility class are meant as a temporary user-space compatibility
495  * workaround when converting a family of class devices to a bus devices.
514  * class_compat_unregister - unregister a compatibility class
515  * @cls: the class to unregister
525  * class_compat_create_link - create a compatibility class device link to
527  * @cls: the compatibility class
542 	 * class device would have one and we want to provide as much  in class_compat_create_link()
557  * class_compat_remove_link - remove a compatibility class device link to
559  * @cls: the compatibility class
575 	class_kset = kset_create_and_add("class", NULL, NULL);  in classes_init()