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.
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.
10 * We also support auxiliary drivers binding to devices of a certain class.
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.
16 * Auxiliary drivers registered with a NULL cls are registered as drivers
17 * for all system devices, and get notification calls for each device.
24 #include <linux/kobject.h>
25 #include <linux/module.h>
30 struct sysdev_class_attribute;
34 struct list_head drivers;
35 struct sysdev_class_attribute **attrs;
39 struct sysdev_class_attribute {
40 struct attribute attr;
41 ssize_t (*show)(struct sysdev_class *, struct sysdev_class_attribute *,
43 ssize_t (*store)(struct sysdev_class *, struct sysdev_class_attribute *,
44 const char *, size_t);
47 #define _SYSDEV_CLASS_ATTR(_name,_mode,_show,_store) \
49 .attr = {.name = __stringify(_name), .mode = _mode }, \
54 #define SYSDEV_CLASS_ATTR(_name,_mode,_show,_store) \
55 struct sysdev_class_attribute attr_##_name = \
56 _SYSDEV_CLASS_ATTR(_name,_mode,_show,_store)
59 extern int sysdev_class_register(struct sysdev_class *);
60 extern void sysdev_class_unregister(struct sysdev_class *);
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 *);
67 * Auxiliary system device drivers.
70 struct sysdev_driver {
71 struct list_head entry;
72 int (*add)(struct sys_device *);
73 int (*remove)(struct sys_device *);
77 extern int sysdev_driver_register(struct sysdev_class *, struct sysdev_driver *);
78 extern void sysdev_driver_unregister(struct sysdev_class *, struct sysdev_driver *);
82 * sys_devices can be simplified a lot from regular devices, because they're
83 * simply not as versatile.
88 struct sysdev_class * cls;
92 extern int sysdev_register(struct sys_device *);
93 extern void sysdev_unregister(struct sys_device *);
96 struct 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);
104 #define _SYSDEV_ATTR(_name, _mode, _show, _store) \
106 .attr = { .name = __stringify(_name), .mode = _mode }, \
111 #define SYSDEV_ATTR(_name, _mode, _show, _store) \
112 struct sysdev_attribute attr_##_name = \
113 _SYSDEV_ATTR(_name, _mode, _show, _store);
115 extern int sysdev_create_file(struct sys_device *, struct sysdev_attribute *);
116 extern void sysdev_remove_file(struct sys_device *, struct sysdev_attribute *);
118 /* Create/remove NULL terminated attribute list */
120 sysdev_create_files(struct sys_device *d, struct sysdev_attribute **a)
122 return sysfs_create_files(&d->kobj, (const struct attribute **)a);
126 sysdev_remove_files(struct sys_device *d, struct sysdev_attribute **a)
128 return sysfs_remove_files(&d->kobj, (const struct attribute **)a);
131 struct sysdev_ext_attribute {
132 struct sysdev_attribute attr;
137 * Support for simple variable sysdev attributes.
138 * The pointer to the variable is stored in a sysdev_ext_attribute
141 /* Add more types as needed */
143 extern ssize_t sysdev_show_ulong(struct sys_device *, struct sysdev_attribute *,
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 *,
149 extern ssize_t sysdev_store_int(struct sys_device *,
150 struct sysdev_attribute *, const char *, size_t);
152 #define _SYSDEV_ULONG_ATTR(_name, _mode, _var) \
153 { _SYSDEV_ATTR(_name, _mode, sysdev_show_ulong, sysdev_store_ulong), \
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), \
161 #define SYSDEV_INT_ATTR(_name, _mode, _var) \
162 struct sysdev_ext_attribute attr_##_name = \
163 _SYSDEV_INT_ATTR(_name, _mode, _var);
165 #endif /* _SYSDEV_H_ */