[net-next-2.6.git] / kernel / ksysfs.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
/* current uevent sequence number */
static ssize_t uevent_seqnum_show(struct subsystem *subsys, char *page)
{
	return sprintf(page, "%llu\n", (unsigned long long)hotplug_seqnum);
}
KERNEL_ATTR_RO(uevent_seqnum);

/* uevent helper program, used during early boo */
static ssize_t uevent_helper_show(struct subsystem *subsys, char *page)
{
	return sprintf(page, "%s\n", hotplug_path);
}
static ssize_t uevent_helper_store(struct subsystem *subsys, const char *page, size_t count)
{
	if (count+1 > HOTPLUG_PATH_LEN)
		return -ENOENT;
	memcpy(hotplug_path, page, count);
	hotplug_path[count] = '\0';
	if (count && hotplug_path[count-1] == '\n')
		hotplug_path[count-1] = '\0';
	return count;
}
KERNEL_ATTR_RW(uevent_helper);
#endif

#ifdef CONFIG_KEXEC
#include <asm/kexec.h>

static ssize_t crash_notes_show(struct subsystem *subsys, char *page)
{
	return sprintf(page, "%p\n", (void *)crash_notes);
}
KERNEL_ATTR_RO(crash_notes);
#endif

decl_subsys(kernel, NULL, NULL);
EXPORT_SYMBOL_GPL(kernel_subsys);

static struct attribute * kernel_attrs[] = {
#ifdef CONFIG_HOTPLUG
	&uevent_seqnum_attr.attr,
	&uevent_helper_attr.attr,
#endif
#ifdef CONFIG_KEXEC
	&crash_notes_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);
Commit	Line	Data
1da177e4 LT	1	/*
	2	* kernel/ksysfs.c - sysfs attributes in /sys/kernel, which
	3	* are not related to any other subsystem
	4	*
	5	* Copyright (C) 2004 Kay Sievers <kay.sievers@vrfy.org>
	6	*
	7	* This file is release under the GPLv2
	8	*
	9	*/
	10
	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>
	17
	18	#define KERNEL_ATTR_RO(_name) \
	19	static struct subsys_attribute _name##_attr = __ATTR_RO(_name)
	20
	21	#define KERNEL_ATTR_RW(_name) \
	22	static struct subsys_attribute _name##_attr = \
	23	__ATTR(_name, 0644, _name##_show, _name##_store)
	24
	25	#ifdef CONFIG_HOTPLUG
0f76e5ac KS	26	/* current uevent sequence number */
0f76e5ac KS	27	static ssize_t uevent_seqnum_show(struct subsystem subsys, char page)
1da177e4 LT	28	{
	29	return sprintf(page, "%llu\n", (unsigned long long)hotplug_seqnum);
	30	}
0f76e5ac KS	31	KERNEL_ATTR_RO(uevent_seqnum);
	32
	33	/* uevent helper program, used during early boo */
	34	static ssize_t uevent_helper_show(struct subsystem subsys, char page)
	35	{
	36	return sprintf(page, "%s\n", hotplug_path);
	37	}
	38	static ssize_t uevent_helper_store(struct subsystem subsys, const char page, size_t count)
	39	{
	40	if (count+1 > HOTPLUG_PATH_LEN)
	41	return -ENOENT;
	42	memcpy(hotplug_path, page, count);
	43	hotplug_path[count] = '\0';
	44	if (count && hotplug_path[count-1] == '\n')
	45	hotplug_path[count-1] = '\0';
	46	return count;
	47	}
	48	KERNEL_ATTR_RW(uevent_helper);
1da177e4 LT	49	#endif
1da177e4 LT	50
625f1c82 VG	51	#ifdef CONFIG_KEXEC
	52	#include <asm/kexec.h>
	53
	54	static ssize_t crash_notes_show(struct subsystem subsys, char page)
	55	{
	56	return sprintf(page, "%p\n", (void *)crash_notes);
	57	}
	58	KERNEL_ATTR_RO(crash_notes);
	59	#endif
	60
1da177e4 LT	61	decl_subsys(kernel, NULL, NULL);
	62	EXPORT_SYMBOL_GPL(kernel_subsys);
	63
	64	static struct attribute * kernel_attrs[] = {
	65	#ifdef CONFIG_HOTPLUG
0f76e5ac KS	66	&uevent_seqnum_attr.attr,
0f76e5ac KS	67	&uevent_helper_attr.attr,
625f1c82 VG	68	#endif
	69	#ifdef CONFIG_KEXEC
	70	&crash_notes_attr.attr,
1da177e4 LT	71	#endif
	72	NULL
	73	};
	74
	75	static struct attribute_group kernel_attr_group = {
	76	.attrs = kernel_attrs,
	77	};
	78
	79	static int __init ksysfs_init(void)
	80	{
	81	int error = subsystem_register(&kernel_subsys);
	82	if (!error)
	83	error = sysfs_create_group(&kernel_subsys.kset.kobj,
	84	&kernel_attr_group);
	85
	86	return error;
	87	}
	88
	89	core_initcall(ksysfs_init);