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;
37 #ifndef CONFIG_ARCH_NO_SYSDEV_OPS
38 /* Default operations for these types of devices */
39 int (*shutdown)(struct sys_device *);
40 int (*suspend)(struct sys_device *, pm_message_t state);
41 int (*resume)(struct sys_device *);
45 struct sysdev_class_attribute {
46 struct attribute attr;
47 ssize_t (*show)(struct sysdev_class *, struct sysdev_class_attribute *,
49 ssize_t (*store)(struct sysdev_class *, struct sysdev_class_attribute *,
50 const char *, size_t);
53 #define _SYSDEV_CLASS_ATTR(_name,_mode,_show,_store) \
55 .attr = {.name = __stringify(_name), .mode = _mode }, \
60 #define SYSDEV_CLASS_ATTR(_name,_mode,_show,_store) \
61 struct sysdev_class_attribute attr_##_name = \
62 _SYSDEV_CLASS_ATTR(_name,_mode,_show,_store)
65 extern int sysdev_class_register(struct sysdev_class *);
66 extern void sysdev_class_unregister(struct sysdev_class *);
68 extern int sysdev_class_create_file(struct sysdev_class *,
69 struct sysdev_class_attribute *);
70 extern void sysdev_class_remove_file(struct sysdev_class *,
71 struct sysdev_class_attribute *);
73 * Auxiliary system device drivers.
76 struct sysdev_driver {
77 struct list_head entry;
78 int (*add)(struct sys_device *);
79 int (*remove)(struct sys_device *);
80 #ifndef CONFIG_ARCH_NO_SYSDEV_OPS
81 int (*shutdown)(struct sys_device *);
82 int (*suspend)(struct sys_device *, pm_message_t state);
83 int (*resume)(struct sys_device *);
88 extern int sysdev_driver_register(struct sysdev_class *, struct sysdev_driver *);
89 extern void sysdev_driver_unregister(struct sysdev_class *, struct sysdev_driver *);
93 * sys_devices can be simplified a lot from regular devices, because they're
94 * simply not as versatile.
99 struct sysdev_class * cls;
103 extern int sysdev_register(struct sys_device *);
104 extern void sysdev_unregister(struct sys_device *);
107 struct sysdev_attribute {
108 struct attribute attr;
109 ssize_t (*show)(struct sys_device *, struct sysdev_attribute *, char *);
110 ssize_t (*store)(struct sys_device *, struct sysdev_attribute *,
111 const char *, size_t);
115 #define _SYSDEV_ATTR(_name, _mode, _show, _store) \
117 .attr = { .name = __stringify(_name), .mode = _mode }, \
122 #define SYSDEV_ATTR(_name, _mode, _show, _store) \
123 struct sysdev_attribute attr_##_name = \
124 _SYSDEV_ATTR(_name, _mode, _show, _store);
126 extern int sysdev_create_file(struct sys_device *, struct sysdev_attribute *);
127 extern void sysdev_remove_file(struct sys_device *, struct sysdev_attribute *);
129 /* Create/remove NULL terminated attribute list */
131 sysdev_create_files(struct sys_device *d, struct sysdev_attribute **a)
133 return sysfs_create_files(&d->kobj, (const struct attribute **)a);
137 sysdev_remove_files(struct sys_device *d, struct sysdev_attribute **a)
139 return sysfs_remove_files(&d->kobj, (const struct attribute **)a);
142 struct sysdev_ext_attribute {
143 struct sysdev_attribute attr;
148 * Support for simple variable sysdev attributes.
149 * The pointer to the variable is stored in a sysdev_ext_attribute
152 /* Add more types as needed */
154 extern ssize_t sysdev_show_ulong(struct sys_device *, struct sysdev_attribute *,
156 extern ssize_t sysdev_store_ulong(struct sys_device *,
157 struct sysdev_attribute *, const char *, size_t);
158 extern ssize_t sysdev_show_int(struct sys_device *, struct sysdev_attribute *,
160 extern ssize_t sysdev_store_int(struct sys_device *,
161 struct sysdev_attribute *, const char *, size_t);
163 #define _SYSDEV_ULONG_ATTR(_name, _mode, _var) \
164 { _SYSDEV_ATTR(_name, _mode, sysdev_show_ulong, sysdev_store_ulong), \
166 #define SYSDEV_ULONG_ATTR(_name, _mode, _var) \
167 struct sysdev_ext_attribute attr_##_name = \
168 _SYSDEV_ULONG_ATTR(_name, _mode, _var);
169 #define _SYSDEV_INT_ATTR(_name, _mode, _var) \
170 { _SYSDEV_ATTR(_name, _mode, sysdev_show_int, sysdev_store_int), \
172 #define SYSDEV_INT_ATTR(_name, _mode, _var) \
173 struct sysdev_ext_attribute attr_##_name = \
174 _SYSDEV_INT_ATTR(_name, _mode, _var);
176 #endif /* _SYSDEV_H_ */