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1da177e4 LT |
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 | * | |
25985edc | 10 | * We also support auxiliary drivers binding to devices of a certain class. |
1da177e4 LT |
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 | * | |
25985edc | 16 | * Auxiliary drivers registered with a NULL cls are registered as drivers |
1da177e4 LT |
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> | |
3367b994 | 25 | #include <linux/module.h> |
438510f6 | 26 | #include <linux/pm.h> |
1da177e4 LT |
27 | |
28 | ||
29 | struct sys_device; | |
38457ab3 | 30 | struct sysdev_class_attribute; |
1da177e4 LT |
31 | |
32 | struct sysdev_class { | |
af5ca3f4 | 33 | const char *name; |
1da177e4 | 34 | struct list_head drivers; |
38457ab3 | 35 | struct sysdev_class_attribute **attrs; |
d47d81c0 | 36 | struct kset kset; |
1da177e4 LT |
37 | }; |
38 | ||
670dd90d SL |
39 | struct sysdev_class_attribute { |
40 | struct attribute attr; | |
c9be0a36 AK |
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); | |
670dd90d SL |
45 | }; |
46 | ||
9d1fe323 MT |
47 | #define _SYSDEV_CLASS_ATTR(_name,_mode,_show,_store) \ |
48 | { \ | |
670dd90d SL |
49 | .attr = {.name = __stringify(_name), .mode = _mode }, \ |
50 | .show = _show, \ | |
51 | .store = _store, \ | |
9d1fe323 MT |
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) | |
670dd90d | 57 | |
1da177e4 LT |
58 | |
59 | extern int sysdev_class_register(struct sysdev_class *); | |
60 | extern void sysdev_class_unregister(struct sysdev_class *); | |
61 | ||
670dd90d SL |
62 | extern int sysdev_class_create_file(struct sysdev_class *, |
63 | struct sysdev_class_attribute *); | |
64 | extern void sysdev_class_remove_file(struct sysdev_class *, | |
65 | struct sysdev_class_attribute *); | |
1da177e4 | 66 | /** |
25985edc | 67 | * Auxiliary system device drivers. |
1da177e4 LT |
68 | */ |
69 | ||
70 | struct sysdev_driver { | |
71 | struct list_head entry; | |
72 | int (*add)(struct sys_device *); | |
73 | int (*remove)(struct sys_device *); | |
1da177e4 LT |
74 | }; |
75 | ||
76 | ||
77 | extern int sysdev_driver_register(struct sysdev_class *, struct sysdev_driver *); | |
78 | extern 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 | ||
86 | struct sys_device { | |
87 | u32 id; | |
88 | struct sysdev_class * cls; | |
89 | struct kobject kobj; | |
90 | }; | |
91 | ||
92 | extern int sysdev_register(struct sys_device *); | |
93 | extern void sysdev_unregister(struct sys_device *); | |
94 | ||
95 | ||
96 | struct sysdev_attribute { | |
97 | struct attribute attr; | |
4a0b2b4d AK |
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); | |
1da177e4 LT |
101 | }; |
102 | ||
103 | ||
9d1fe323 | 104 | #define _SYSDEV_ATTR(_name, _mode, _show, _store) \ |
7583b6e4 | 105 | { \ |
7b595756 | 106 | .attr = { .name = __stringify(_name), .mode = _mode }, \ |
1da177e4 LT |
107 | .show = _show, \ |
108 | .store = _store, \ | |
7583b6e4 OJ |
109 | } |
110 | ||
9d1fe323 MT |
111 | #define SYSDEV_ATTR(_name, _mode, _show, _store) \ |
112 | struct sysdev_attribute attr_##_name = \ | |
113 | _SYSDEV_ATTR(_name, _mode, _show, _store); | |
1da177e4 LT |
114 | |
115 | extern int sysdev_create_file(struct sys_device *, struct sysdev_attribute *); | |
116 | extern void sysdev_remove_file(struct sys_device *, struct sysdev_attribute *); | |
117 | ||
1e395ab3 AK |
118 | /* Create/remove NULL terminated attribute list */ |
119 | static inline int | |
120 | sysdev_create_files(struct sys_device *d, struct sysdev_attribute **a) | |
121 | { | |
122 | return sysfs_create_files(&d->kobj, (const struct attribute **)a); | |
123 | } | |
124 | ||
125 | static inline void | |
126 | sysdev_remove_files(struct sys_device *d, struct sysdev_attribute **a) | |
127 | { | |
128 | return sysfs_remove_files(&d->kobj, (const struct attribute **)a); | |
129 | } | |
130 | ||
9800794a AK |
131 | struct 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 | ||
143 | extern ssize_t sysdev_show_ulong(struct sys_device *, struct sysdev_attribute *, | |
144 | char *); | |
145 | extern ssize_t sysdev_store_ulong(struct sys_device *, | |
146 | struct sysdev_attribute *, const char *, size_t); | |
147 | extern ssize_t sysdev_show_int(struct sys_device *, struct sysdev_attribute *, | |
148 | char *); | |
149 | extern 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 | ||
1da177e4 | 165 | #endif /* _SYSDEV_H_ */ |