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[PATCH] Driver Core: Allow sysdev_class have attributes 

allow sysdev_class adding attribute. Next patch will use the new API to
add an attribute under /sys/device/system/cpu/.

Signed-off-by: Shaohua Li <shaohua.li@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
hifive-unleashed-5.1
Shaohua Li 2006-05-08 13:45:57 +08:00 committed by Greg Kroah-Hartman
parent 1740757e8f
commit 670dd90d81
2 changed files with 67 additions and 2 deletions
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51
drivers/base/sys.c
View File

@ -80,10 +80,59 @@ void sysdev_remove_file(struct sys_device * s, struct sysdev_attribute * a)
EXPORT_SYMBOL_GPL(sysdev_create_file);
EXPORT_SYMBOL_GPL(sysdev_remove_file);
#define to_sysdev_class(k) container_of(k, struct sysdev_class, kset.kobj)
#define to_sysdev_class_attr(a) container_of(a, \
struct sysdev_class_attribute, attr)
static ssize_t sysdev_class_show(struct kobject *kobj, struct attribute *attr,
char *buffer)
{
struct sysdev_class * class = to_sysdev_class(kobj);
struct sysdev_class_attribute *class_attr = to_sysdev_class_attr(attr);
if (class_attr->show)
return class_attr->show(class, buffer);
return -EIO;
}
static ssize_t sysdev_class_store(struct kobject *kobj, struct attribute *attr,
const char *buffer, size_t count)
{
struct sysdev_class * class = to_sysdev_class(kobj);
struct sysdev_class_attribute * class_attr = to_sysdev_class_attr(attr);
if (class_attr->store)
return class_attr->store(class, buffer, count);
return -EIO;
}
static struct sysfs_ops sysfs_class_ops = {
.show = sysdev_class_show,
.store = sysdev_class_store,
};
static struct kobj_type ktype_sysdev_class = {
.sysfs_ops = &sysfs_class_ops,
};
int sysdev_class_create_file(struct sysdev_class *c,
struct sysdev_class_attribute *a)
{
return sysfs_create_file(&c->kset.kobj, &a->attr);
}
EXPORT_SYMBOL_GPL(sysdev_class_create_file);
void sysdev_class_remove_file(struct sysdev_class *c,
struct sysdev_class_attribute *a)
{
sysfs_remove_file(&c->kset.kobj, &a->attr);
}
EXPORT_SYMBOL_GPL(sysdev_class_remove_file);
/*
* declare system_subsys
*/
static decl_subsys(system, &ktype_sysdev, NULL);
static decl_subsys(system, &ktype_sysdev_class, NULL);
int sysdev_class_register(struct sysdev_class * cls)
{

18
include/linux/sysdev.h
View File

@ -37,11 +37,27 @@ struct sysdev_class {
struct kset kset;
};
struct sysdev_class_attribute {
struct attribute attr;
ssize_t (*show)(struct sysdev_class *, char *);
ssize_t (*store)(struct sysdev_class *, const char *, size_t);
};
#define SYSDEV_CLASS_ATTR(_name,_mode,_show,_store) \
struct sysdev_class_attribute attr_##_name = { \
.attr = {.name = __stringify(_name), .mode = _mode }, \
.show = _show, \
.store = _store, \
};
extern int sysdev_class_register(struct sysdev_class *);
extern void sysdev_class_unregister(struct sysdev_class *);
extern int sysdev_class_create_file(struct sysdev_class *,
struct sysdev_class_attribute *);
extern void sysdev_class_remove_file(struct sysdev_class *,
struct sysdev_class_attribute *);
/**
* Auxillary system device drivers.
*/