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 */
29struct 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
47struct 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 * @knode_class - node in class list
64 * @deferred_probe - entry in deferred_probe_list which is used to retry the
65 * binding of drivers which were unable to get all the resources needed by
66 * the device; typically because it depends on another driver getting
67 * probed first.
68 * @async_driver - pointer to device driver awaiting probe via async_probe
69 * @device - pointer back to the struct device that this structure is
70 * associated with.
71 * @dead - This device is currently either in the process of or has been
72 * removed from the system. Any asynchronous events scheduled for this
73 * device should exit without taking any action.
74 *
75 * Nothing outside of the driver core should ever touch these fields.
76 */
77struct device_private {
78 struct klist klist_children;
79 struct klist_node knode_parent;
80 struct klist_node knode_driver;
81 struct klist_node knode_bus;
82 struct klist_node knode_class;
83 struct list_head deferred_probe;
84 struct device_driver *async_driver;
85 struct device *device;
86 u8 dead:1;
87};
88#define to_device_private_parent(obj) \
89 container_of(obj, struct device_private, knode_parent)
90#define to_device_private_driver(obj) \
91 container_of(obj, struct device_private, knode_driver)
92#define to_device_private_bus(obj) \
93 container_of(obj, struct device_private, knode_bus)
94#define to_device_private_class(obj) \
95 container_of(obj, struct device_private, knode_class)
96
97/* initialisation functions */
98extern int devices_init(void);
99extern int buses_init(void);
100extern int classes_init(void);
101extern int firmware_init(void);
102#ifdef CONFIG_SYS_HYPERVISOR
103extern int hypervisor_init(void);
104#else
105static inline int hypervisor_init(void) { return 0; }
106#endif
107extern int platform_bus_init(void);
108extern void cpu_dev_init(void);
109extern void container_dev_init(void);
110
111struct kobject *virtual_device_parent(struct device *dev);
112
113extern int bus_add_device(struct device *dev);
114extern void bus_probe_device(struct device *dev);
115extern void bus_remove_device(struct device *dev);
116
117extern int bus_add_driver(struct device_driver *drv);
118extern void bus_remove_driver(struct device_driver *drv);
119extern void device_release_driver_internal(struct device *dev,
120 struct device_driver *drv,
121 struct device *parent);
122
123extern void driver_detach(struct device_driver *drv);
124extern int driver_probe_device(struct device_driver *drv, struct device *dev);
125extern void driver_deferred_probe_del(struct device *dev);
126static inline int driver_match_device(struct device_driver *drv,
127 struct device *dev)
128{
129 return drv->bus->match ? drv->bus->match(dev, drv) : 1;
130}
131extern bool driver_allows_async_probing(struct device_driver *drv);
132
133extern int driver_add_groups(struct device_driver *drv,
134 const struct attribute_group **groups);
135extern void driver_remove_groups(struct device_driver *drv,
136 const struct attribute_group **groups);
137int device_driver_attach(struct device_driver *drv, struct device *dev);
138void device_driver_detach(struct device *dev);
139
140extern char *make_class_name(const char *name, struct kobject *kobj);
141
142extern int devres_release_all(struct device *dev);
143extern void device_block_probing(void);
144extern void device_unblock_probing(void);
145
146/* /sys/devices directory */
147extern struct kset *devices_kset;
148extern void devices_kset_move_last(struct device *dev);
149
150#if defined(CONFIG_MODULES) && defined(CONFIG_SYSFS)
151extern void module_add_driver(struct module *mod, struct device_driver *drv);
152extern void module_remove_driver(struct device_driver *drv);
153#else
154static inline void module_add_driver(struct module *mod,
155 struct device_driver *drv) { }
156static inline void module_remove_driver(struct device_driver *drv) { }
157#endif
158
159#ifdef CONFIG_DEVTMPFS
160extern int devtmpfs_init(void);
161#else
162static inline int devtmpfs_init(void) { return 0; }
163#endif
164
165/* Device links support */
166extern int device_links_read_lock(void);
167extern void device_links_read_unlock(int idx);
168extern int device_links_check_suppliers(struct device *dev);
169extern void device_links_driver_bound(struct device *dev);
170extern void device_links_driver_cleanup(struct device *dev);
171extern void device_links_no_driver(struct device *dev);
172extern bool device_links_busy(struct device *dev);
173extern void device_links_unbind_consumers(struct device *dev);
174
175/* device pm support */
176void device_pm_move_to_tail(struct device *dev);
177