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/include/linux/sysdev.h

https://bitbucket.org/thekraven/iscream_thunderc-2.6.35
C++ Header | 173 lines | 107 code | 34 blank | 32 comment | 0 complexity | 9705714b173e8a564fba5df4e5aa61b3 MD5 | raw file
Possible License(s): GPL-2.0, LGPL-2.0, AGPL-1.0
  1/**
  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.
  6 * 
  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. 
  9 *
 10 * We also support auxillary drivers binding to devices of a certain class.
 11 * 
 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.
 15 *
 16 * Auxillary drivers registered with a NULL cls are registered as drivers
 17 * for all system devices, and get notification calls for each device. 
 18 */
 19
 20
 21#ifndef _SYSDEV_H_
 22#define _SYSDEV_H_
 23
 24#include <linux/kobject.h>
 25#include <linux/module.h>
 26#include <linux/pm.h>
 27
 28
 29struct sys_device;
 30struct sysdev_class_attribute;
 31
 32struct sysdev_class {
 33	const char *name;
 34	struct list_head	drivers;
 35	struct sysdev_class_attribute **attrs;
 36
 37	/* Default operations for these types of devices */
 38	int	(*shutdown)(struct sys_device *);
 39	int	(*suspend)(struct sys_device *, pm_message_t state);
 40	int	(*resume)(struct sys_device *);
 41	struct kset		kset;
 42};
 43
 44struct sysdev_class_attribute {
 45	struct attribute attr;
 46	ssize_t (*show)(struct sysdev_class *, struct sysdev_class_attribute *,
 47			char *);
 48	ssize_t (*store)(struct sysdev_class *, struct sysdev_class_attribute *,
 49			 const char *, size_t);
 50};
 51
 52#define _SYSDEV_CLASS_ATTR(_name,_mode,_show,_store) 		\
 53{					 			\
 54	.attr = {.name = __stringify(_name), .mode = _mode },	\
 55	.show	= _show,					\
 56	.store	= _store,					\
 57}
 58
 59#define SYSDEV_CLASS_ATTR(_name,_mode,_show,_store) 		\
 60	struct sysdev_class_attribute attr_##_name = 		\
 61		_SYSDEV_CLASS_ATTR(_name,_mode,_show,_store)
 62
 63
 64extern int sysdev_class_register(struct sysdev_class *);
 65extern void sysdev_class_unregister(struct sysdev_class *);
 66
 67extern int sysdev_class_create_file(struct sysdev_class *,
 68	struct sysdev_class_attribute *);
 69extern void sysdev_class_remove_file(struct sysdev_class *,
 70	struct sysdev_class_attribute *);
 71/**
 72 * Auxillary system device drivers.
 73 */
 74
 75struct sysdev_driver {
 76	struct list_head	entry;
 77	int	(*add)(struct sys_device *);
 78	int	(*remove)(struct sys_device *);
 79	int	(*shutdown)(struct sys_device *);
 80	int	(*suspend)(struct sys_device *, pm_message_t state);
 81	int	(*resume)(struct sys_device *);
 82};
 83
 84
 85extern int sysdev_driver_register(struct sysdev_class *, struct sysdev_driver *);
 86extern void sysdev_driver_unregister(struct sysdev_class *, struct sysdev_driver *);
 87
 88
 89/**
 90 * sys_devices can be simplified a lot from regular devices, because they're
 91 * simply not as versatile. 
 92 */
 93
 94struct sys_device {
 95	u32		id;
 96	struct sysdev_class	* cls;
 97	struct kobject		kobj;
 98};
 99
100extern int sysdev_register(struct sys_device *);
101extern void sysdev_unregister(struct sys_device *);
102
103
104struct sysdev_attribute { 
105	struct attribute	attr;
106	ssize_t (*show)(struct sys_device *, struct sysdev_attribute *, char *);
107	ssize_t (*store)(struct sys_device *, struct sysdev_attribute *,
108			 const char *, size_t);
109};
110
111
112#define _SYSDEV_ATTR(_name, _mode, _show, _store)		\
113{								\
114	.attr = { .name = __stringify(_name), .mode = _mode },	\
115	.show	= _show,					\
116	.store	= _store,					\
117}
118
119#define SYSDEV_ATTR(_name, _mode, _show, _store)		\
120	struct sysdev_attribute attr_##_name =			\
121		_SYSDEV_ATTR(_name, _mode, _show, _store);
122
123extern int sysdev_create_file(struct sys_device *, struct sysdev_attribute *);
124extern void sysdev_remove_file(struct sys_device *, struct sysdev_attribute *);
125
126/* Create/remove NULL terminated attribute list */
127static inline int
128sysdev_create_files(struct sys_device *d, struct sysdev_attribute **a)
129{
130	return sysfs_create_files(&d->kobj, (const struct attribute **)a);
131}
132
133static inline void
134sysdev_remove_files(struct sys_device *d, struct sysdev_attribute **a)
135{
136	return sysfs_remove_files(&d->kobj, (const struct attribute **)a);
137}
138
139struct sysdev_ext_attribute {
140	struct sysdev_attribute attr;
141	void *var;
142};
143
144/*
145 * Support for simple variable sysdev attributes.
146 * The pointer to the variable is stored in a sysdev_ext_attribute
147 */
148
149/* Add more types as needed */
150
151extern ssize_t sysdev_show_ulong(struct sys_device *, struct sysdev_attribute *,
152				char *);
153extern ssize_t sysdev_store_ulong(struct sys_device *,
154			struct sysdev_attribute *, const char *, size_t);
155extern ssize_t sysdev_show_int(struct sys_device *, struct sysdev_attribute *,
156				char *);
157extern ssize_t sysdev_store_int(struct sys_device *,
158			struct sysdev_attribute *, const char *, size_t);
159
160#define _SYSDEV_ULONG_ATTR(_name, _mode, _var)				\
161	{ _SYSDEV_ATTR(_name, _mode, sysdev_show_ulong, sysdev_store_ulong), \
162	  &(_var) }
163#define SYSDEV_ULONG_ATTR(_name, _mode, _var)			\
164	struct sysdev_ext_attribute attr_##_name = 		\
165		_SYSDEV_ULONG_ATTR(_name, _mode, _var);
166#define _SYSDEV_INT_ATTR(_name, _mode, _var)				\
167	{ _SYSDEV_ATTR(_name, _mode, sysdev_show_int, sysdev_store_int), \
168	  &(_var) }
169#define SYSDEV_INT_ATTR(_name, _mode, _var)			\
170	struct sysdev_ext_attribute attr_##_name = 		\
171		_SYSDEV_INT_ATTR(_name, _mode, _var);
172
173#endif /* _SYSDEV_H_ */