device.h: move 'struct class' stuff out to device/class.h

device.h has everything and the kitchen sink when it comes to struct
device things, so split out the struct class things things to a separate
.h file to make things easier to maintain and manage over time.

Cc: "Rafael J. Wysocki" <[email protected]>
Cc: Suzuki K Poulose <[email protected]>
Cc: Saravana Kannan <[email protected]>
Cc: Heikki Krogerus <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>

Author: gregkh

drivers/base/class.c

@@ -8,6 +8,7 @@
  * Copyright (c) 2003-2004 IBM Corp.
  */
 
+#include <linux/device/class.h>
 #include <linux/device.h>
 #include <linux/module.h>
 #include <linux/init.h>

include/linux/device.h

@@ -27,6 +27,7 @@
 #include <linux/gfp.h>
 #include <linux/overflow.h>
 #include <linux/device/bus.h>
+#include <linux/device/class.h>
 #include <asm/device.h>
 
 struct device;
@@ -294,246 +295,6 @@ int subsys_system_register(struct bus_type *subsys,
 int subsys_virtual_register(struct bus_type *subsys,
 			    const struct attribute_group **groups);
 
-/**
- * struct class - device classes
- * @name:	Name of the class.
- * @owner:	The module owner.
- * @class_groups: Default attributes of this class.
- * @dev_groups:	Default attributes of the devices that belong to the class.
- * @dev_kobj:	The kobject that represents this class and links it into the hierarchy.
- * @dev_uevent:	Called when a device is added, removed from this class, or a
- *		few other things that generate uevents to add the environment
- *		variables.
- * @devnode:	Callback to provide the devtmpfs.
- * @class_release: Called to release this class.
- * @dev_release: Called to release the device.
- * @shutdown_pre: Called at shut-down time before driver shutdown.
- * @ns_type:	Callbacks so sysfs can detemine namespaces.
- * @namespace:	Namespace of the device belongs to this class.
- * @get_ownership: Allows class to specify uid/gid of the sysfs directories
- *		for the devices belonging to the class. Usually tied to
- *		device's namespace.
- * @pm:		The default device power management operations of this class.
- * @p:		The private data of the driver core, no one other than the
- *		driver core can touch this.
- *
- * A class is a higher-level view of a device that abstracts out low-level
- * implementation details. Drivers may see a SCSI disk or an ATA disk, but,
- * at the class level, they are all simply disks. Classes allow user space
- * to work with devices based on what they do, rather than how they are
- * connected or how they work.
- */
-struct class {
-	const char		*name;
-	struct module		*owner;
-
-	const struct attribute_group	**class_groups;
-	const struct attribute_group	**dev_groups;
-	struct kobject			*dev_kobj;
-
-	int (*dev_uevent)(struct device *dev, struct kobj_uevent_env *env);
-	char *(*devnode)(struct device *dev, umode_t *mode);
-
-	void (*class_release)(struct class *class);
-	void (*dev_release)(struct device *dev);
-
-	int (*shutdown_pre)(struct device *dev);
-
-	const struct kobj_ns_type_operations *ns_type;
-	const void *(*namespace)(struct device *dev);
-
-	void (*get_ownership)(struct device *dev, kuid_t *uid, kgid_t *gid);
-
-	const struct dev_pm_ops *pm;
-
-	struct subsys_private *p;
-};
-
-struct class_dev_iter {
-	struct klist_iter		ki;
-	const struct device_type	*type;
-};
-
-extern struct kobject *sysfs_dev_block_kobj;
-extern struct kobject *sysfs_dev_char_kobj;
-extern int __must_check __class_register(struct class *class,
-					 struct lock_class_key *key);
-extern void class_unregister(struct class *class);
-
-/* This is a #define to keep the compiler from merging different
- * instances of the __key variable */
-#define class_register(class)			\
-({						\
-	static struct lock_class_key __key;	\
-	__class_register(class, &__key);	\
-})
-
-struct class_compat;
-struct class_compat *class_compat_register(const char *name);
-void class_compat_unregister(struct class_compat *cls);
-int class_compat_create_link(struct class_compat *cls, struct device *dev,
-			     struct device *device_link);
-void class_compat_remove_link(struct class_compat *cls, struct device *dev,
-			      struct device *device_link);
-
-extern void class_dev_iter_init(struct class_dev_iter *iter,
-				struct class *class,
-				struct device *start,
-				const struct device_type *type);
-extern struct device *class_dev_iter_next(struct class_dev_iter *iter);
-extern void class_dev_iter_exit(struct class_dev_iter *iter);
-
-extern int class_for_each_device(struct class *class, struct device *start,
-				 void *data,
-				 int (*fn)(struct device *dev, void *data));
-extern struct device *class_find_device(struct class *class,
-					struct device *start, const void *data,
-					int (*match)(struct device *, const void *));
-
-/**
- * class_find_device_by_name - device iterator for locating a particular device
- * of a specific name.
- * @class: class type
- * @name: name of the device to match
- */
-static inline struct device *class_find_device_by_name(struct class *class,
-						       const char *name)
-{
-	return class_find_device(class, NULL, name, device_match_name);
-}
-
-/**
- * class_find_device_by_of_node : device iterator for locating a particular device
- * matching the of_node.
- * @class: class type
- * @np: of_node of the device to match.
- */
-static inline struct device *
-class_find_device_by_of_node(struct class *class, const struct device_node *np)
-{
-	return class_find_device(class, NULL, np, device_match_of_node);
-}
-
-/**
- * class_find_device_by_fwnode : device iterator for locating a particular device
- * matching the fwnode.
- * @class: class type
- * @fwnode: fwnode of the device to match.
- */
-static inline struct device *
-class_find_device_by_fwnode(struct class *class,
-			    const struct fwnode_handle *fwnode)
-{
-	return class_find_device(class, NULL, fwnode, device_match_fwnode);
-}
-
-/**
- * class_find_device_by_devt : device iterator for locating a particular device
- * matching the device type.
- * @class: class type
- * @devt: device type of the device to match.
- */
-static inline struct device *class_find_device_by_devt(struct class *class,
-						       dev_t devt)
-{
-	return class_find_device(class, NULL, &devt, device_match_devt);
-}
-
-#ifdef CONFIG_ACPI
-struct acpi_device;
-/**
- * class_find_device_by_acpi_dev : device iterator for locating a particular
- * device matching the ACPI_COMPANION device.
- * @class: class type
- * @adev: ACPI_COMPANION device to match.
- */
-static inline struct device *
-class_find_device_by_acpi_dev(struct class *class, const struct acpi_device *adev)
-{
-	return class_find_device(class, NULL, adev, device_match_acpi_dev);
-}
-#else
-static inline struct device *
-class_find_device_by_acpi_dev(struct class *class, const void *adev)
-{
-	return NULL;
-}
-#endif
-
-struct class_attribute {
-	struct attribute attr;
-	ssize_t (*show)(struct class *class, struct class_attribute *attr,
-			char *buf);
-	ssize_t (*store)(struct class *class, struct class_attribute *attr,
-			const char *buf, size_t count);
-};
-
-#define CLASS_ATTR_RW(_name) \
-	struct class_attribute class_attr_##_name = __ATTR_RW(_name)
-#define CLASS_ATTR_RO(_name) \
-	struct class_attribute class_attr_##_name = __ATTR_RO(_name)
-#define CLASS_ATTR_WO(_name) \
-	struct class_attribute class_attr_##_name = __ATTR_WO(_name)
-
-extern int __must_check class_create_file_ns(struct class *class,
-					     const struct class_attribute *attr,
-					     const void *ns);
-extern void class_remove_file_ns(struct class *class,
-				 const struct class_attribute *attr,
-				 const void *ns);
-
-static inline int __must_check class_create_file(struct class *class,
-					const struct class_attribute *attr)
-{
-	return class_create_file_ns(class, attr, NULL);
-}
-
-static inline void class_remove_file(struct class *class,
-				     const struct class_attribute *attr)
-{
-	return class_remove_file_ns(class, attr, NULL);
-}
-
-/* Simple class attribute that is just a static string */
-struct class_attribute_string {
-	struct class_attribute attr;
-	char *str;
-};
-
-/* Currently read-only only */
-#define _CLASS_ATTR_STRING(_name, _mode, _str) \
-	{ __ATTR(_name, _mode, show_class_attr_string, NULL), _str }
-#define CLASS_ATTR_STRING(_name, _mode, _str) \
-	struct class_attribute_string class_attr_##_name = \
-		_CLASS_ATTR_STRING(_name, _mode, _str)
-
-extern ssize_t show_class_attr_string(struct class *class, struct class_attribute *attr,
-                        char *buf);
-
-struct class_interface {
-	struct list_head	node;
-	struct class		*class;
-
-	int (*add_dev)		(struct device *, struct class_interface *);
-	void (*remove_dev)	(struct device *, struct class_interface *);
-};
-
-extern int __must_check class_interface_register(struct class_interface *);
-extern void class_interface_unregister(struct class_interface *);
-
-extern struct class * __must_check __class_create(struct module *owner,
-						  const char *name,
-						  struct lock_class_key *key);
-extern void class_destroy(struct class *cls);
-
-/* This is a #define to keep the compiler from merging different
- * instances of the __key variable */
-#define class_create(owner, name)		\
-({						\
-	static struct lock_class_key __key;	\
-	__class_create(owner, name, &__key);	\
-})
-
 /*
  * The type of device, "struct device" is embedded in. A class
  * or bus can contain devices of different types