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1/* SPDX-License-Identifier: GPL-2.0 */
2/*
3 * Copyright (c) 2001-2003 Patrick Mochel <mochel@osdl.org>
4 * Copyright (c) 2004-2009 Greg Kroah-Hartman <gregkh@suse.de>
5 * Copyright (c) 2008-2012 Novell Inc.
6 * Copyright (c) 2012-2019 Greg Kroah-Hartman <gregkh@linuxfoundation.org>
7 * Copyright (c) 2012-2019 Linux Foundation
8 *
9 * Core driver model functions and structures that should not be
10 * shared outside of the drivers/base/ directory.
11 *
12 */
13#include <linux/notifier.h>
14
15/**
16 * struct subsys_private - structure to hold the private to the driver core portions of the bus_type/class structure.
17 *
18 * @subsys - the struct kset that defines this subsystem
19 * @devices_kset - the subsystem's 'devices' directory
20 * @interfaces - list of subsystem interfaces associated
21 * @mutex - protect the devices, and interfaces lists.
22 *
23 * @drivers_kset - the list of drivers associated
24 * @klist_devices - the klist to iterate over the @devices_kset
25 * @klist_drivers - the klist to iterate over the @drivers_kset
26 * @bus_notifier - the bus notifier list for anything that cares about things
27 * on this bus.
28 * @bus - pointer back to the struct bus_type that this structure is associated
29 * with.
30 * @dev_root: Default device to use as the parent.
31 *
32 * @glue_dirs - "glue" directory to put in-between the parent device to
33 * avoid namespace conflicts
34 * @class - pointer back to the struct class that this structure is associated
35 * with.
36 * @lock_key: Lock class key for use by the lock validator
37 *
38 * This structure is the one that is the actual kobject allowing struct
39 * bus_type/class to be statically allocated safely. Nothing outside of the
40 * driver core should ever touch these fields.
41 */
42struct subsys_private {
43 struct kset subsys;
44 struct kset *devices_kset;
45 struct list_head interfaces;
46 struct mutex mutex;
47
48 struct kset *drivers_kset;
49 struct klist klist_devices;
50 struct klist klist_drivers;
51 struct blocking_notifier_head bus_notifier;
52 unsigned int drivers_autoprobe:1;
53 const struct bus_type *bus;
54 struct device *dev_root;
55
56 struct kset glue_dirs;
57 const struct class *class;
58
59 struct lock_class_key lock_key;
60};
61#define to_subsys_private(obj) container_of_const(obj, struct subsys_private, subsys.kobj)
62
63static inline struct subsys_private *subsys_get(struct subsys_private *sp)
64{
65 if (sp)
66 kset_get(&sp->subsys);
67 return sp;
68}
69
70static inline void subsys_put(struct subsys_private *sp)
71{
72 if (sp)
73 kset_put(&sp->subsys);
74}
75
76struct subsys_private *class_to_subsys(const struct class *class);
77
78struct driver_private {
79 struct kobject kobj;
80 struct klist klist_devices;
81 struct klist_node knode_bus;
82 struct module_kobject *mkobj;
83 struct device_driver *driver;
84};
85#define to_driver(obj) container_of(obj, struct driver_private, kobj)
86
87/**
88 * struct device_private - structure to hold the private to the driver core portions of the device structure.
89 *
90 * @klist_children - klist containing all children of this device
91 * @knode_parent - node in sibling list
92 * @knode_driver - node in driver list
93 * @knode_bus - node in bus list
94 * @knode_class - node in class list
95 * @deferred_probe - entry in deferred_probe_list which is used to retry the
96 * binding of drivers which were unable to get all the resources needed by
97 * the device; typically because it depends on another driver getting
98 * probed first.
99 * @async_driver - pointer to device driver awaiting probe via async_probe
100 * @device - pointer back to the struct device that this structure is
101 * associated with.
102 * @dead - This device is currently either in the process of or has been
103 * removed from the system. Any asynchronous events scheduled for this
104 * device should exit without taking any action.
105 *
106 * Nothing outside of the driver core should ever touch these fields.
107 */
108struct device_private {
109 struct klist klist_children;
110 struct klist_node knode_parent;
111 struct klist_node knode_driver;
112 struct klist_node knode_bus;
113 struct klist_node knode_class;
114 struct list_head deferred_probe;
115 struct device_driver *async_driver;
116 char *deferred_probe_reason;
117 struct device *device;
118 u8 dead:1;
119};
120#define to_device_private_parent(obj) \
121 container_of(obj, struct device_private, knode_parent)
122#define to_device_private_driver(obj) \
123 container_of(obj, struct device_private, knode_driver)
124#define to_device_private_bus(obj) \
125 container_of(obj, struct device_private, knode_bus)
126#define to_device_private_class(obj) \
127 container_of(obj, struct device_private, knode_class)
128
129/* initialisation functions */
130int devices_init(void);
131int buses_init(void);
132int classes_init(void);
133int firmware_init(void);
134#ifdef CONFIG_SYS_HYPERVISOR
135int hypervisor_init(void);
136#else
137static inline int hypervisor_init(void) { return 0; }
138#endif
139int platform_bus_init(void);
140void cpu_dev_init(void);
141void container_dev_init(void);
142#ifdef CONFIG_AUXILIARY_BUS
143void auxiliary_bus_init(void);
144#else
145static inline void auxiliary_bus_init(void) { }
146#endif
147
148struct kobject *virtual_device_parent(struct device *dev);
149
150int bus_add_device(struct device *dev);
151void bus_probe_device(struct device *dev);
152void bus_remove_device(struct device *dev);
153void bus_notify(struct device *dev, enum bus_notifier_event value);
154bool bus_is_registered(const struct bus_type *bus);
155
156int bus_add_driver(struct device_driver *drv);
157void bus_remove_driver(struct device_driver *drv);
158void device_release_driver_internal(struct device *dev, struct device_driver *drv,
159 struct device *parent);
160
161void driver_detach(struct device_driver *drv);
162void driver_deferred_probe_del(struct device *dev);
163void device_set_deferred_probe_reason(const struct device *dev, struct va_format *vaf);
164static inline int driver_match_device(struct device_driver *drv,
165 struct device *dev)
166{
167 return drv->bus->match ? drv->bus->match(dev, drv) : 1;
168}
169
170static inline void dev_sync_state(struct device *dev)
171{
172 if (dev->bus->sync_state)
173 dev->bus->sync_state(dev);
174 else if (dev->driver && dev->driver->sync_state)
175 dev->driver->sync_state(dev);
176}
177
178int driver_add_groups(struct device_driver *drv, const struct attribute_group **groups);
179void driver_remove_groups(struct device_driver *drv, const struct attribute_group **groups);
180void device_driver_detach(struct device *dev);
181
182int devres_release_all(struct device *dev);
183void device_block_probing(void);
184void device_unblock_probing(void);
185void deferred_probe_extend_timeout(void);
186void driver_deferred_probe_trigger(void);
187const char *device_get_devnode(const struct device *dev, umode_t *mode,
188 kuid_t *uid, kgid_t *gid, const char **tmp);
189
190/* /sys/devices directory */
191extern struct kset *devices_kset;
192void devices_kset_move_last(struct device *dev);
193
194#if defined(CONFIG_MODULES) && defined(CONFIG_SYSFS)
195void module_add_driver(struct module *mod, struct device_driver *drv);
196void module_remove_driver(struct device_driver *drv);
197#else
198static inline void module_add_driver(struct module *mod,
199 struct device_driver *drv) { }
200static inline void module_remove_driver(struct device_driver *drv) { }
201#endif
202
203#ifdef CONFIG_DEVTMPFS
204int devtmpfs_init(void);
205#else
206static inline int devtmpfs_init(void) { return 0; }
207#endif
208
209#ifdef CONFIG_BLOCK
210extern struct class block_class;
211static inline bool is_blockdev(struct device *dev)
212{
213 return dev->class == &block_class;
214}
215#else
216static inline bool is_blockdev(struct device *dev) { return false; }
217#endif
218
219/* Device links support */
220int device_links_read_lock(void);
221void device_links_read_unlock(int idx);
222int device_links_read_lock_held(void);
223int device_links_check_suppliers(struct device *dev);
224void device_links_force_bind(struct device *dev);
225void device_links_driver_bound(struct device *dev);
226void device_links_driver_cleanup(struct device *dev);
227void device_links_no_driver(struct device *dev);
228bool device_links_busy(struct device *dev);
229void device_links_unbind_consumers(struct device *dev);
230void fw_devlink_drivers_done(void);
231void fw_devlink_probing_done(void);
232
233/* device pm support */
234void device_pm_move_to_tail(struct device *dev);
235
236#ifdef CONFIG_DEVTMPFS
237int devtmpfs_create_node(struct device *dev);
238int devtmpfs_delete_node(struct device *dev);
239#else
240static inline int devtmpfs_create_node(struct device *dev) { return 0; }
241static inline int devtmpfs_delete_node(struct device *dev) { return 0; }
242#endif
243
244void software_node_notify(struct device *dev);
245void software_node_notify_remove(struct device *dev);
1#include <linux/notifier.h>
2
3/**
4 * struct subsys_private - structure to hold the private to the driver core portions of the bus_type/class structure.
5 *
6 * @subsys - the struct kset that defines this subsystem
7 * @devices_kset - the subsystem's 'devices' directory
8 * @interfaces - list of subsystem interfaces associated
9 * @mutex - protect the devices, and interfaces lists.
10 *
11 * @drivers_kset - the list of drivers associated
12 * @klist_devices - the klist to iterate over the @devices_kset
13 * @klist_drivers - the klist to iterate over the @drivers_kset
14 * @bus_notifier - the bus notifier list for anything that cares about things
15 * on this bus.
16 * @bus - pointer back to the struct bus_type that this structure is associated
17 * with.
18 *
19 * @glue_dirs - "glue" directory to put in-between the parent device to
20 * avoid namespace conflicts
21 * @class - pointer back to the struct class that this structure is associated
22 * with.
23 *
24 * This structure is the one that is the actual kobject allowing struct
25 * bus_type/class to be statically allocated safely. Nothing outside of the
26 * driver core should ever touch these fields.
27 */
28struct subsys_private {
29 struct kset subsys;
30 struct kset *devices_kset;
31 struct list_head interfaces;
32 struct mutex mutex;
33
34 struct kset *drivers_kset;
35 struct klist klist_devices;
36 struct klist klist_drivers;
37 struct blocking_notifier_head bus_notifier;
38 unsigned int drivers_autoprobe:1;
39 struct bus_type *bus;
40
41 struct kset glue_dirs;
42 struct class *class;
43};
44#define to_subsys_private(obj) container_of(obj, struct subsys_private, subsys.kobj)
45
46struct driver_private {
47 struct kobject kobj;
48 struct klist klist_devices;
49 struct klist_node knode_bus;
50 struct module_kobject *mkobj;
51 struct device_driver *driver;
52};
53#define to_driver(obj) container_of(obj, struct driver_private, kobj)
54
55/**
56 * struct device_private - structure to hold the private to the driver core portions of the device structure.
57 *
58 * @klist_children - klist containing all children of this device
59 * @knode_parent - node in sibling list
60 * @knode_driver - node in driver list
61 * @knode_bus - node in bus list
62 * @deferred_probe - entry in deferred_probe_list which is used to retry the
63 * binding of drivers which were unable to get all the resources needed by
64 * the device; typically because it depends on another driver getting
65 * probed first.
66 * @driver_data - private pointer for driver specific info. Will turn into a
67 * list soon.
68 * @device - pointer back to the struct class that this structure is
69 * associated with.
70 *
71 * Nothing outside of the driver core should ever touch these fields.
72 */
73struct device_private {
74 struct klist klist_children;
75 struct klist_node knode_parent;
76 struct klist_node knode_driver;
77 struct klist_node knode_bus;
78 struct list_head deferred_probe;
79 void *driver_data;
80 struct device *device;
81};
82#define to_device_private_parent(obj) \
83 container_of(obj, struct device_private, knode_parent)
84#define to_device_private_driver(obj) \
85 container_of(obj, struct device_private, knode_driver)
86#define to_device_private_bus(obj) \
87 container_of(obj, struct device_private, knode_bus)
88
89extern int device_private_init(struct device *dev);
90
91/* initialisation functions */
92extern int devices_init(void);
93extern int buses_init(void);
94extern int classes_init(void);
95extern int firmware_init(void);
96#ifdef CONFIG_SYS_HYPERVISOR
97extern int hypervisor_init(void);
98#else
99static inline int hypervisor_init(void) { return 0; }
100#endif
101extern int platform_bus_init(void);
102extern void cpu_dev_init(void);
103extern void container_dev_init(void);
104
105struct kobject *virtual_device_parent(struct device *dev);
106
107extern int bus_add_device(struct device *dev);
108extern void bus_probe_device(struct device *dev);
109extern void bus_remove_device(struct device *dev);
110
111extern int bus_add_driver(struct device_driver *drv);
112extern void bus_remove_driver(struct device_driver *drv);
113
114extern void driver_detach(struct device_driver *drv);
115extern int driver_probe_device(struct device_driver *drv, struct device *dev);
116extern void driver_deferred_probe_del(struct device *dev);
117static inline int driver_match_device(struct device_driver *drv,
118 struct device *dev)
119{
120 return drv->bus->match ? drv->bus->match(dev, drv) : 1;
121}
122
123extern int driver_add_groups(struct device_driver *drv,
124 const struct attribute_group **groups);
125extern void driver_remove_groups(struct device_driver *drv,
126 const struct attribute_group **groups);
127
128extern int device_add_groups(struct device *dev,
129 const struct attribute_group **groups);
130extern void device_remove_groups(struct device *dev,
131 const struct attribute_group **groups);
132
133extern char *make_class_name(const char *name, struct kobject *kobj);
134
135extern int devres_release_all(struct device *dev);
136
137/* /sys/devices directory */
138extern struct kset *devices_kset;
139
140#if defined(CONFIG_MODULES) && defined(CONFIG_SYSFS)
141extern void module_add_driver(struct module *mod, struct device_driver *drv);
142extern void module_remove_driver(struct device_driver *drv);
143#else
144static inline void module_add_driver(struct module *mod,
145 struct device_driver *drv) { }
146static inline void module_remove_driver(struct device_driver *drv) { }
147#endif
148
149#ifdef CONFIG_DEVTMPFS
150extern int devtmpfs_init(void);
151#else
152static inline int devtmpfs_init(void) { return 0; }
153#endif