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 auxillary 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 * Auxillary 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>
32 struct list_head drivers;
34 /* Default operations for these types of devices */
35 int (*shutdown)(struct sys_device *);
36 int (*suspend)(struct sys_device *, pm_message_t state);
37 int (*resume)(struct sys_device *);
41 struct sysdev_class_attribute {
42 struct attribute attr;
43 ssize_t (*show)(struct sysdev_class *, char *);
44 ssize_t (*store)(struct sysdev_class *, const char *, size_t);
47 #define SYSDEV_CLASS_ATTR(_name,_mode,_show,_store) \
48 struct sysdev_class_attribute attr_##_name = { \
49 .attr = {.name = __stringify(_name), .mode = _mode }, \
55 extern int sysdev_class_register(struct sysdev_class *);
56 extern void sysdev_class_unregister(struct sysdev_class *);
58 extern int sysdev_class_create_file(struct sysdev_class *,
59 struct sysdev_class_attribute *);
60 extern void sysdev_class_remove_file(struct sysdev_class *,
61 struct sysdev_class_attribute *);
63 * Auxillary system device drivers.
66 struct sysdev_driver {
67 struct list_head entry;
68 int (*add)(struct sys_device *);
69 int (*remove)(struct sys_device *);
70 int (*shutdown)(struct sys_device *);
71 int (*suspend)(struct sys_device *, pm_message_t state);
72 int (*resume)(struct sys_device *);
76 extern int sysdev_driver_register(struct sysdev_class *, struct sysdev_driver *);
77 extern void sysdev_driver_unregister(struct sysdev_class *, struct sysdev_driver *);
81 * sys_devices can be simplified a lot from regular devices, because they're
82 * simply not as versatile.
87 struct sysdev_class * cls;
91 extern int sysdev_register(struct sys_device *);
92 extern void sysdev_unregister(struct sys_device *);
95 struct sysdev_attribute {
96 struct attribute attr;
97 ssize_t (*show)(struct sys_device *, char *);
98 ssize_t (*store)(struct sys_device *, const char *, size_t);
102 #define _SYSDEV_ATTR(_name,_mode,_show,_store) \
104 .attr = { .name = __stringify(_name), .mode = _mode, \
105 .owner = THIS_MODULE }, \
110 #define SYSDEV_ATTR(_name,_mode,_show,_store) \
111 struct sysdev_attribute attr_##_name = _SYSDEV_ATTR(_name,_mode,_show,_store);
113 extern int sysdev_create_file(struct sys_device *, struct sysdev_attribute *);
114 extern void sysdev_remove_file(struct sys_device *, struct sysdev_attribute *);
116 #endif /* _SYSDEV_H_ */