Linux kernel mirror (for testing)
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linux
1/**
2 * System devices follow a slightly different driver model.
3 * They don't need to do dynammic driver binding, can't be probed,
4 * and don't reside on any type of peripheral bus.
5 * So, we represent and treat them a little differently.
6 *
7 * We still have a notion of a driver for a system device, because we still
8 * want to perform basic operations on these devices.
9 *
10 * We also support auxiliary drivers binding to devices of a certain class.
11 *
12 * This allows configurable drivers to register themselves for devices of
13 * a certain type. And, it allows class definitions to reside in generic
14 * code while arch-specific code can register specific drivers.
15 *
16 * Auxiliary drivers registered with a NULL cls are registered as drivers
17 * for all system devices, and get notification calls for each device.
18 */
19
20
21#ifndef _SYSDEV_H_
22#define _SYSDEV_H_
23
24#include <linux/kobject.h>
25#include <linux/module.h>
26#include <linux/pm.h>
27
28
29struct sys_device;
30struct sysdev_class_attribute;
31
32struct sysdev_class {
33 const char *name;
34 struct list_head drivers;
35 struct sysdev_class_attribute **attrs;
36 struct kset kset;
37};
38
39struct sysdev_class_attribute {
40 struct attribute attr;
41 ssize_t (*show)(struct sysdev_class *, struct sysdev_class_attribute *,
42 char *);
43 ssize_t (*store)(struct sysdev_class *, struct sysdev_class_attribute *,
44 const char *, size_t);
45};
46
47#define _SYSDEV_CLASS_ATTR(_name,_mode,_show,_store) \
48{ \
49 .attr = {.name = __stringify(_name), .mode = _mode }, \
50 .show = _show, \
51 .store = _store, \
52}
53
54#define SYSDEV_CLASS_ATTR(_name,_mode,_show,_store) \
55 struct sysdev_class_attribute attr_##_name = \
56 _SYSDEV_CLASS_ATTR(_name,_mode,_show,_store)
57
58
59extern int sysdev_class_register(struct sysdev_class *);
60extern void sysdev_class_unregister(struct sysdev_class *);
61
62extern int sysdev_class_create_file(struct sysdev_class *,
63 struct sysdev_class_attribute *);
64extern void sysdev_class_remove_file(struct sysdev_class *,
65 struct sysdev_class_attribute *);
66/**
67 * Auxiliary system device drivers.
68 */
69
70struct sysdev_driver {
71 struct list_head entry;
72 int (*add)(struct sys_device *);
73 int (*remove)(struct sys_device *);
74};
75
76
77extern int sysdev_driver_register(struct sysdev_class *, struct sysdev_driver *);
78extern void sysdev_driver_unregister(struct sysdev_class *, struct sysdev_driver *);
79
80
81/**
82 * sys_devices can be simplified a lot from regular devices, because they're
83 * simply not as versatile.
84 */
85
86struct sys_device {
87 u32 id;
88 struct sysdev_class * cls;
89 struct kobject kobj;
90};
91
92extern int sysdev_register(struct sys_device *);
93extern void sysdev_unregister(struct sys_device *);
94
95
96struct sysdev_attribute {
97 struct attribute attr;
98 ssize_t (*show)(struct sys_device *, struct sysdev_attribute *, char *);
99 ssize_t (*store)(struct sys_device *, struct sysdev_attribute *,
100 const char *, size_t);
101};
102
103
104#define _SYSDEV_ATTR(_name, _mode, _show, _store) \
105{ \
106 .attr = { .name = __stringify(_name), .mode = _mode }, \
107 .show = _show, \
108 .store = _store, \
109}
110
111#define SYSDEV_ATTR(_name, _mode, _show, _store) \
112 struct sysdev_attribute attr_##_name = \
113 _SYSDEV_ATTR(_name, _mode, _show, _store);
114
115extern int sysdev_create_file(struct sys_device *, struct sysdev_attribute *);
116extern void sysdev_remove_file(struct sys_device *, struct sysdev_attribute *);
117
118/* Create/remove NULL terminated attribute list */
119static inline int
120sysdev_create_files(struct sys_device *d, struct sysdev_attribute **a)
121{
122 return sysfs_create_files(&d->kobj, (const struct attribute **)a);
123}
124
125static inline void
126sysdev_remove_files(struct sys_device *d, struct sysdev_attribute **a)
127{
128 return sysfs_remove_files(&d->kobj, (const struct attribute **)a);
129}
130
131struct sysdev_ext_attribute {
132 struct sysdev_attribute attr;
133 void *var;
134};
135
136/*
137 * Support for simple variable sysdev attributes.
138 * The pointer to the variable is stored in a sysdev_ext_attribute
139 */
140
141/* Add more types as needed */
142
143extern ssize_t sysdev_show_ulong(struct sys_device *, struct sysdev_attribute *,
144 char *);
145extern ssize_t sysdev_store_ulong(struct sys_device *,
146 struct sysdev_attribute *, const char *, size_t);
147extern ssize_t sysdev_show_int(struct sys_device *, struct sysdev_attribute *,
148 char *);
149extern ssize_t sysdev_store_int(struct sys_device *,
150 struct sysdev_attribute *, const char *, size_t);
151
152#define _SYSDEV_ULONG_ATTR(_name, _mode, _var) \
153 { _SYSDEV_ATTR(_name, _mode, sysdev_show_ulong, sysdev_store_ulong), \
154 &(_var) }
155#define SYSDEV_ULONG_ATTR(_name, _mode, _var) \
156 struct sysdev_ext_attribute attr_##_name = \
157 _SYSDEV_ULONG_ATTR(_name, _mode, _var);
158#define _SYSDEV_INT_ATTR(_name, _mode, _var) \
159 { _SYSDEV_ATTR(_name, _mode, sysdev_show_int, sysdev_store_int), \
160 &(_var) }
161#define SYSDEV_INT_ATTR(_name, _mode, _var) \
162 struct sysdev_ext_attribute attr_##_name = \
163 _SYSDEV_INT_ATTR(_name, _mode, _var);
164
165#endif /* _SYSDEV_H_ */