[PATCH] IDE CD reports current speed
[linux-2.6/next.git] / kernel / ksysfs.c
blob1f064a63f8cfe7b7f575b82c38315bf5e79f2344
1 /*
2 * kernel/ksysfs.c - sysfs attributes in /sys/kernel, which
3 * are not related to any other subsystem
5 * Copyright (C) 2004 Kay Sievers <kay.sievers@vrfy.org>
6 *
7 * This file is release under the GPLv2
9 */
11 #include <linux/config.h>
12 #include <linux/kobject.h>
13 #include <linux/string.h>
14 #include <linux/sysfs.h>
15 #include <linux/module.h>
16 #include <linux/init.h>
18 #define KERNEL_ATTR_RO(_name) \
19 static struct subsys_attribute _name##_attr = __ATTR_RO(_name)
21 #define KERNEL_ATTR_RW(_name) \
22 static struct subsys_attribute _name##_attr = \
23 __ATTR(_name, 0644, _name##_show, _name##_store)
25 #ifdef CONFIG_HOTPLUG
26 static ssize_t hotplug_seqnum_show(struct subsystem *subsys, char *page)
28 return sprintf(page, "%llu\n", (unsigned long long)hotplug_seqnum);
30 KERNEL_ATTR_RO(hotplug_seqnum);
31 #endif
33 decl_subsys(kernel, NULL, NULL);
34 EXPORT_SYMBOL_GPL(kernel_subsys);
36 static struct attribute * kernel_attrs[] = {
37 #ifdef CONFIG_HOTPLUG
38 &hotplug_seqnum_attr.attr,
39 #endif
40 NULL
43 static struct attribute_group kernel_attr_group = {
44 .attrs = kernel_attrs,
47 static int __init ksysfs_init(void)
49 int error = subsystem_register(&kernel_subsys);
50 if (!error)
51 error = sysfs_create_group(&kernel_subsys.kset.kobj,
52 &kernel_attr_group);
54 return error;
57 core_initcall(ksysfs_init);