Root/drivers/base/base.h

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);
103
104extern int bus_add_device(struct device *dev);
105extern void bus_probe_device(struct device *dev);
106extern void bus_remove_device(struct device *dev);
107
108extern int bus_add_driver(struct device_driver *drv);
109extern void bus_remove_driver(struct device_driver *drv);
110
111extern void driver_detach(struct device_driver *drv);
112extern int driver_probe_device(struct device_driver *drv, struct device *dev);
113extern void driver_deferred_probe_del(struct device *dev);
114static inline int driver_match_device(struct device_driver *drv,
115                      struct device *dev)
116{
117    return drv->bus->match ? drv->bus->match(dev, drv) : 1;
118}
119
120extern char *make_class_name(const char *name, struct kobject *kobj);
121
122extern int devres_release_all(struct device *dev);
123
124/* /sys/devices directory */
125extern struct kset *devices_kset;
126
127#if defined(CONFIG_MODULES) && defined(CONFIG_SYSFS)
128extern void module_add_driver(struct module *mod, struct device_driver *drv);
129extern void module_remove_driver(struct device_driver *drv);
130#else
131static inline void module_add_driver(struct module *mod,
132                     struct device_driver *drv) { }
133static inline void module_remove_driver(struct device_driver *drv) { }
134#endif
135
136#ifdef CONFIG_DEVTMPFS
137extern int devtmpfs_init(void);
138#else
139static inline int devtmpfs_init(void) { return 0; }
140#endif
141

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