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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 | ||
25 | #ifdef CONFIG_HOTPLUG | |
0f76e5ac KS |
26 | /* current uevent sequence number */ |
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 |
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, |
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); |