1 /* SPDX-License-Identifier: GPL-2.0 */
2 #include <linux/notifier.h>
3 
4 /**
5  * struct subsys_private - structure to hold the private to the driver core portions of the bus_type/class structure.
6  *
7  * @subsys - the struct kset that defines this subsystem
8  * @devices_kset - the subsystem's 'devices' directory
9  * @interfaces - list of subsystem interfaces associated
10  * @mutex - protect the devices, and interfaces lists.
11  *
12  * @drivers_kset - the list of drivers associated
13  * @klist_devices - the klist to iterate over the @devices_kset
14  * @klist_drivers - the klist to iterate over the @drivers_kset
15  * @bus_notifier - the bus notifier list for anything that cares about things
16  *                 on this bus.
17  * @bus - pointer back to the struct bus_type that this structure is associated
18  *        with.
19  *
20  * @glue_dirs - "glue" directory to put in-between the parent device to
21  *              avoid namespace conflicts
22  * @class - pointer back to the struct class that this structure is associated
23  *          with.
24  *
25  * This structure is the one that is the actual kobject allowing struct
26  * bus_type/class to be statically allocated safely.  Nothing outside of the
27  * driver core should ever touch these fields.
28  */
29 struct subsys_private {
30 	struct kset subsys;
31 	struct kset *devices_kset;
32 	struct list_head interfaces;
33 	struct mutex mutex;
34 
35 	struct kset *drivers_kset;
36 	struct klist klist_devices;
37 	struct klist klist_drivers;
38 	struct blocking_notifier_head bus_notifier;
39 	unsigned int drivers_autoprobe:1;
40 	struct bus_type *bus;
41 
42 	struct kset glue_dirs;
43 	struct class *class;
44 };
45 #define to_subsys_private(obj) container_of(obj, struct subsys_private, subsys.kobj)
46 
47 struct driver_private {
48 	struct kobject kobj;
49 	struct klist klist_devices;
50 	struct klist_node knode_bus;
51 	struct module_kobject *mkobj;
52 	struct device_driver *driver;
53 };
54 #define to_driver(obj) container_of(obj, struct driver_private, kobj)
55 
56 /**
57  * struct device_private - structure to hold the private to the driver core portions of the device structure.
58  *
59  * @klist_children - klist containing all children of this device
60  * @knode_parent - node in sibling list
61  * @knode_driver - node in driver list
62  * @knode_bus - node in bus list
63  * @deferred_probe - entry in deferred_probe_list which is used to retry the
64  *	binding of drivers which were unable to get all the resources needed by
65  *	the device; typically because it depends on another driver getting
66  *	probed first.
67  * @device - pointer back to the struct device that this structure is
68  * associated with.
69  * @dead - This device is currently either in the process of or has been
70  *	removed from the system. Any asynchronous events scheduled for this
71  *	device should exit without taking any action.
72  *
73  * Nothing outside of the driver core should ever touch these fields.
74  */
75 struct device_private {
76 	struct klist klist_children;
77 	struct klist_node knode_parent;
78 	struct klist_node knode_driver;
79 	struct klist_node knode_bus;
80 	struct list_head deferred_probe;
81 	struct device *device;
82 	u8 dead:1;
83 };
84 #define to_device_private_parent(obj)	\
85 	container_of(obj, struct device_private, knode_parent)
86 #define to_device_private_driver(obj)	\
87 	container_of(obj, struct device_private, knode_driver)
88 #define to_device_private_bus(obj)	\
89 	container_of(obj, struct device_private, knode_bus)
90 
91 /* initialisation functions */
92 extern int devices_init(void);
93 extern int buses_init(void);
94 extern int classes_init(void);
95 extern int firmware_init(void);
96 #ifdef CONFIG_SYS_HYPERVISOR
97 extern int hypervisor_init(void);
98 #else
hypervisor_init(void)99 static inline int hypervisor_init(void) { return 0; }
100 #endif
101 extern int platform_bus_init(void);
102 extern void cpu_dev_init(void);
103 extern void container_dev_init(void);
104 
105 struct kobject *virtual_device_parent(struct device *dev);
106 
107 extern int bus_add_device(struct device *dev);
108 extern void bus_probe_device(struct device *dev);
109 extern void bus_remove_device(struct device *dev);
110 
111 extern int bus_add_driver(struct device_driver *drv);
112 extern void bus_remove_driver(struct device_driver *drv);
113 extern void device_release_driver_internal(struct device *dev,
114 					   struct device_driver *drv,
115 					   struct device *parent);
116 
117 extern void driver_detach(struct device_driver *drv);
118 extern int driver_probe_device(struct device_driver *drv, struct device *dev);
119 extern void driver_deferred_probe_del(struct device *dev);
driver_match_device(struct device_driver * drv,struct device * dev)120 static inline int driver_match_device(struct device_driver *drv,
121 				      struct device *dev)
122 {
123 	return drv->bus->match ? drv->bus->match(dev, drv) : 1;
124 }
125 extern bool driver_allows_async_probing(struct device_driver *drv);
126 
127 extern int driver_add_groups(struct device_driver *drv,
128 			     const struct attribute_group **groups);
129 extern void driver_remove_groups(struct device_driver *drv,
130 				 const struct attribute_group **groups);
131 
132 extern char *make_class_name(const char *name, struct kobject *kobj);
133 
134 extern int devres_release_all(struct device *dev);
135 extern void device_block_probing(void);
136 extern void device_unblock_probing(void);
137 
138 /* /sys/devices directory */
139 extern struct kset *devices_kset;
140 extern void devices_kset_move_last(struct device *dev);
141 
142 #if defined(CONFIG_MODULES) && defined(CONFIG_SYSFS)
143 extern void module_add_driver(struct module *mod, struct device_driver *drv);
144 extern void module_remove_driver(struct device_driver *drv);
145 #else
module_add_driver(struct module * mod,struct device_driver * drv)146 static inline void module_add_driver(struct module *mod,
147 				     struct device_driver *drv) { }
module_remove_driver(struct device_driver * drv)148 static inline void module_remove_driver(struct device_driver *drv) { }
149 #endif
150 
151 #ifdef CONFIG_DEVTMPFS
152 extern int devtmpfs_init(void);
153 #else
devtmpfs_init(void)154 static inline int devtmpfs_init(void) { return 0; }
155 #endif
156 
157 /* Device links support */
158 extern int device_links_read_lock(void);
159 extern void device_links_read_unlock(int idx);
160 extern int device_links_check_suppliers(struct device *dev);
161 extern void device_links_driver_bound(struct device *dev);
162 extern void device_links_driver_cleanup(struct device *dev);
163 extern void device_links_no_driver(struct device *dev);
164 extern bool device_links_busy(struct device *dev);
165 extern void device_links_unbind_consumers(struct device *dev);
166 
167 /* device pm support */
168 void device_pm_move_to_tail(struct device *dev);
169