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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 | * | |
10 | * We also support auxillary 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 | * Auxillary 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 | ||
26 | ||
27 | struct sys_device; | |
28 | ||
29 | struct sysdev_class { | |
30 | struct list_head drivers; | |
31 | ||
32 | /* Default operations for these types of devices */ | |
33 | int (*shutdown)(struct sys_device *); | |
34 | int (*suspend)(struct sys_device *, u32 state); | |
35 | int (*resume)(struct sys_device *); | |
36 | struct kset kset; | |
37 | }; | |
38 | ||
39 | ||
40 | extern int sysdev_class_register(struct sysdev_class *); | |
41 | extern void sysdev_class_unregister(struct sysdev_class *); | |
42 | ||
43 | ||
44 | /** | |
45 | * Auxillary system device drivers. | |
46 | */ | |
47 | ||
48 | struct sysdev_driver { | |
49 | struct list_head entry; | |
50 | int (*add)(struct sys_device *); | |
51 | int (*remove)(struct sys_device *); | |
52 | int (*shutdown)(struct sys_device *); | |
53 | int (*suspend)(struct sys_device *, u32 state); | |
54 | int (*resume)(struct sys_device *); | |
55 | }; | |
56 | ||
57 | ||
58 | extern int sysdev_driver_register(struct sysdev_class *, struct sysdev_driver *); | |
59 | extern void sysdev_driver_unregister(struct sysdev_class *, struct sysdev_driver *); | |
60 | ||
61 | ||
62 | /** | |
63 | * sys_devices can be simplified a lot from regular devices, because they're | |
64 | * simply not as versatile. | |
65 | */ | |
66 | ||
67 | struct sys_device { | |
68 | u32 id; | |
69 | struct sysdev_class * cls; | |
70 | struct kobject kobj; | |
71 | }; | |
72 | ||
73 | extern int sysdev_register(struct sys_device *); | |
74 | extern void sysdev_unregister(struct sys_device *); | |
75 | ||
76 | ||
77 | struct sysdev_attribute { | |
78 | struct attribute attr; | |
79 | ssize_t (*show)(struct sys_device *, char *); | |
80 | ssize_t (*store)(struct sys_device *, const char *, size_t); | |
81 | }; | |
82 | ||
83 | ||
84 | #define SYSDEV_ATTR(_name,_mode,_show,_store) \ | |
85 | struct sysdev_attribute attr_##_name = { \ | |
86 | .attr = {.name = __stringify(_name), .mode = _mode }, \ | |
87 | .show = _show, \ | |
88 | .store = _store, \ | |
89 | }; | |
90 | ||
91 | extern int sysdev_create_file(struct sys_device *, struct sysdev_attribute *); | |
92 | extern void sysdev_remove_file(struct sys_device *, struct sysdev_attribute *); | |
93 | ||
94 | #endif /* _SYSDEV_H_ */ |