Commit | Line | Data |
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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 | ||
f125b561 | 25 | #if defined(CONFIG_HOTPLUG) && defined(CONFIG_NET) |
0f76e5ac KS |
26 | /* current uevent sequence number */ |
27 | static ssize_t uevent_seqnum_show(struct subsystem *subsys, char *page) | |
1da177e4 | 28 | { |
312c004d | 29 | return sprintf(page, "%llu\n", (unsigned long long)uevent_seqnum); |
1da177e4 | 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 | { | |
312c004d | 36 | return sprintf(page, "%s\n", uevent_helper); |
0f76e5ac KS |
37 | } |
38 | static ssize_t uevent_helper_store(struct subsystem *subsys, const char *page, size_t count) | |
39 | { | |
312c004d | 40 | if (count+1 > UEVENT_HELPER_PATH_LEN) |
0f76e5ac | 41 | return -ENOENT; |
312c004d KS |
42 | memcpy(uevent_helper, page, count); |
43 | uevent_helper[count] = '\0'; | |
44 | if (count && uevent_helper[count-1] == '\n') | |
45 | uevent_helper[count-1] = '\0'; | |
0f76e5ac KS |
46 | return count; |
47 | } | |
48 | KERNEL_ATTR_RW(uevent_helper); | |
1da177e4 LT |
49 | #endif |
50 | ||
51 | decl_subsys(kernel, NULL, NULL); | |
52 | EXPORT_SYMBOL_GPL(kernel_subsys); | |
53 | ||
54 | static struct attribute * kernel_attrs[] = { | |
f125b561 | 55 | #if defined(CONFIG_HOTPLUG) && defined(CONFIG_NET) |
0f76e5ac KS |
56 | &uevent_seqnum_attr.attr, |
57 | &uevent_helper_attr.attr, | |
1da177e4 LT |
58 | #endif |
59 | NULL | |
60 | }; | |
61 | ||
62 | static struct attribute_group kernel_attr_group = { | |
63 | .attrs = kernel_attrs, | |
64 | }; | |
65 | ||
66 | static int __init ksysfs_init(void) | |
67 | { | |
68 | int error = subsystem_register(&kernel_subsys); | |
69 | if (!error) | |
70 | error = sysfs_create_group(&kernel_subsys.kset.kobj, | |
71 | &kernel_attr_group); | |
72 | ||
73 | return error; | |
74 | } | |
75 | ||
76 | core_initcall(ksysfs_init); |