58 lines
1.3 KiB
C
58 lines
1.3 KiB
C
|
/*
|
||
|
|
* kernel/ksysfs.c - sysfs attributes in /sys/kernel, which
|
||
|
|
* are not related to any other subsystem
|
||
|
|
*
|
||
|
|
* Copyright (C) 2004 Kay Sievers <kay.sievers@vrfy.org>
|
||
|
|
*
|
||
|
|
* This file is release under the GPLv2
|
||
|
|
*
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include <linux/config.h>
|
||
|
|
#include <linux/kobject.h>
|
||
|
|
#include <linux/string.h>
|
||
|
|
#include <linux/sysfs.h>
|
||
|
|
#include <linux/module.h>
|
||
|
|
#include <linux/init.h>
|
||
|
|
|
||
|
|
#define KERNEL_ATTR_RO(_name) \
|
||
|
|
static struct subsys_attribute _name##_attr = __ATTR_RO(_name)
|
||
|
|
|
||
|
|
#define KERNEL_ATTR_RW(_name) \
|
||
|
|
static struct subsys_attribute _name##_attr = \
|
||
|
|
__ATTR(_name, 0644, _name##_show, _name##_store)
|
||
|
|
|
||
|
|
#ifdef CONFIG_HOTPLUG
|
||
|
|
static ssize_t hotplug_seqnum_show(struct subsystem *subsys, char *page)
|
||
|
|
{
|
||
|
|
return sprintf(page, "%llu\n", (unsigned long long)hotplug_seqnum);
|
||
|
|
}
|
||
|
|
KERNEL_ATTR_RO(hotplug_seqnum);
|
||
|
|
#endif
|
||
|
|
|
||
|
|
decl_subsys(kernel, NULL, NULL);
|
||
|
|
EXPORT_SYMBOL_GPL(kernel_subsys);
|
||
|
|
|
||
|
|
static struct attribute * kernel_attrs[] = {
|
||
|
|
#ifdef CONFIG_HOTPLUG
|
||
|
|
&hotplug_seqnum_attr.attr,
|
||
|
|
#endif
|
||
|
|
NULL
|
||
|
|
};
|
||
|
|
|
||
|
|
static struct attribute_group kernel_attr_group = {
|
||
|
|
.attrs = kernel_attrs,
|
||
|
|
};
|
||
|
|
|
||
|
|
static int __init ksysfs_init(void)
|
||
|
|
{
|
||
|
|
int error = subsystem_register(&kernel_subsys);
|
||
|
|
if (!error)
|
||
|
|
error = sysfs_create_group(&kernel_subsys.kset.kobj,
|
||
|
|
&kernel_attr_group);
|
||
|
|
|
||
|
|
return error;
|
||
|
|
}
|
||
|
|
|
||
|
|
core_initcall(ksysfs_init);
|