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>
30 struct list_head drivers;
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 *);
40 extern int sysdev_class_register(struct sysdev_class *);
41 extern void sysdev_class_unregister(struct sysdev_class *);
45 * Auxillary system device drivers.
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 *);
58 extern int sysdev_driver_register(struct sysdev_class *, struct sysdev_driver *);
59 extern void sysdev_driver_unregister(struct sysdev_class *, struct sysdev_driver *);
63 * sys_devices can be simplified a lot from regular devices, because they're
64 * simply not as versatile.
69 struct sysdev_class * cls;
73 extern int sysdev_register(struct sys_device *);
74 extern void sysdev_unregister(struct sys_device *);
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);
84 #define SYSDEV_ATTR(_name,_mode,_show,_store) \
85 struct sysdev_attribute attr_##_name = { \
86 .attr = {.name = __stringify(_name), .mode = _mode }, \
91 extern int sysdev_create_file(struct sys_device *, struct sysdev_attribute *);
92 extern void sysdev_remove_file(struct sys_device *, struct sysdev_attribute *);
94 #endif /* _SYSDEV_H_ */