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