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/**
* System devices follow a slightly different driver model.
* They don't need to do dynammic driver binding, can't be probed,
* and don't reside on any type of peripheral bus.
* So, we represent and treat them a little differently.
*
* We still have a notion of a driver for a system device, because we still
* want to perform basic operations on these devices.
*
* We also support auxillary drivers binding to devices of a certain class.
*
* This allows configurable drivers to register themselves for devices of
* a certain type. And, it allows class definitions to reside in generic
* code while arch-specific code can register specific drivers.
*
* Auxillary drivers registered with a NULL cls are registered as drivers
* for all system devices, and get notification calls for each device.
*/
#ifndef _SYSDEV_H_
#define _SYSDEV_H_
#include <linux/kobject.h>
struct sys_device;
struct sysdev_class {
struct list_head drivers;
/* Default operations for these types of devices */
int (*shutdown)(struct sys_device *);
int (*suspend)(struct sys_device *, u32 state);
int (*resume)(struct sys_device *);
struct kset kset;
};
extern int sysdev_class_register(struct sysdev_class *);
extern void sysdev_class_unregister(struct sysdev_class *);
/**
* Auxillary system device drivers.
*/
struct sysdev_driver {
struct list_head entry;
int (*add)(struct sys_device *);
int (*remove)(struct sys_device *);
int (*shutdown)(struct sys_device *);
int (*suspend)(struct sys_device *, u32 state);
int (*resume)(struct sys_device *);
};
extern int sysdev_driver_register(struct sysdev_class *, struct sysdev_driver *);
extern void sysdev_driver_unregister(struct sysdev_class *, struct sysdev_driver *);
/**
* sys_devices can be simplified a lot from regular devices, because they're
* simply not as versatile.
*/
struct sys_device {
u32 id;
struct sysdev_class * cls;
struct kobject kobj;
};
extern int sysdev_register(struct sys_device *);
extern void sysdev_unregister(struct sys_device *);
struct sysdev_attribute {
struct attribute attr;
ssize_t (*show)(struct sys_device *, char *);
ssize_t (*store)(struct sys_device *, const char *, size_t);
};
#define SYSDEV_ATTR(_name,_mode,_show,_store) \
struct sysdev_attribute attr_##_name = { \
.attr = {.name = __stringify(_name), .mode = _mode }, \
.show = _show, \
.store = _store, \
};
extern int sysdev_create_file(struct sys_device *, struct sysdev_attribute *);
extern void sysdev_remove_file(struct sys_device *, struct sysdev_attribute *);
#endif /* _SYSDEV_H_ */
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