Commit | Line | Data |
---|---|---|
4f5c791a LP |
1 | /* |
2 | * Export SMBIOS/DMI info via sysfs to userspace | |
3 | * | |
4 | * Copyright 2007, Lennart Poettering | |
5 | * | |
6 | * Licensed under GPLv2 | |
7 | */ | |
8 | ||
9 | #include <linux/module.h> | |
10 | #include <linux/kernel.h> | |
11 | #include <linux/init.h> | |
12 | #include <linux/dmi.h> | |
13 | #include <linux/device.h> | |
4f5c791a | 14 | |
63744756 JD |
15 | struct dmi_device_attribute{ |
16 | struct device_attribute dev_attr; | |
17 | int field; | |
18 | }; | |
19 | #define to_dmi_dev_attr(_dev_attr) \ | |
20 | container_of(_dev_attr, struct dmi_device_attribute, dev_attr) | |
21 | ||
63744756 JD |
22 | static ssize_t sys_dmi_field_show(struct device *dev, |
23 | struct device_attribute *attr, | |
24 | char *page) | |
25 | { | |
26 | int field = to_dmi_dev_attr(attr)->field; | |
27 | ssize_t len; | |
28 | len = scnprintf(page, PAGE_SIZE, "%s\n", dmi_get_system_info(field)); | |
29 | page[len-1] = '\n'; | |
30 | return len; | |
31 | } | |
32 | ||
33 | #define DMI_ATTR(_name, _mode, _show, _field) \ | |
34 | { .dev_attr = __ATTR(_name, _mode, _show, NULL), \ | |
35 | .field = _field } | |
36 | ||
37 | #define DEFINE_DMI_ATTR_WITH_SHOW(_name, _mode, _field) \ | |
38 | static struct dmi_device_attribute sys_dmi_##_name##_attr = \ | |
39 | DMI_ATTR(_name, _mode, sys_dmi_field_show, _field); | |
4f5c791a LP |
40 | |
41 | DEFINE_DMI_ATTR_WITH_SHOW(bios_vendor, 0444, DMI_BIOS_VENDOR); | |
42 | DEFINE_DMI_ATTR_WITH_SHOW(bios_version, 0444, DMI_BIOS_VERSION); | |
43 | DEFINE_DMI_ATTR_WITH_SHOW(bios_date, 0444, DMI_BIOS_DATE); | |
44 | DEFINE_DMI_ATTR_WITH_SHOW(sys_vendor, 0444, DMI_SYS_VENDOR); | |
45 | DEFINE_DMI_ATTR_WITH_SHOW(product_name, 0444, DMI_PRODUCT_NAME); | |
46 | DEFINE_DMI_ATTR_WITH_SHOW(product_version, 0444, DMI_PRODUCT_VERSION); | |
47 | DEFINE_DMI_ATTR_WITH_SHOW(product_serial, 0400, DMI_PRODUCT_SERIAL); | |
48 | DEFINE_DMI_ATTR_WITH_SHOW(product_uuid, 0400, DMI_PRODUCT_UUID); | |
49 | DEFINE_DMI_ATTR_WITH_SHOW(board_vendor, 0444, DMI_BOARD_VENDOR); | |
50 | DEFINE_DMI_ATTR_WITH_SHOW(board_name, 0444, DMI_BOARD_NAME); | |
51 | DEFINE_DMI_ATTR_WITH_SHOW(board_version, 0444, DMI_BOARD_VERSION); | |
52 | DEFINE_DMI_ATTR_WITH_SHOW(board_serial, 0400, DMI_BOARD_SERIAL); | |
53 | DEFINE_DMI_ATTR_WITH_SHOW(board_asset_tag, 0444, DMI_BOARD_ASSET_TAG); | |
54 | DEFINE_DMI_ATTR_WITH_SHOW(chassis_vendor, 0444, DMI_CHASSIS_VENDOR); | |
55 | DEFINE_DMI_ATTR_WITH_SHOW(chassis_type, 0444, DMI_CHASSIS_TYPE); | |
56 | DEFINE_DMI_ATTR_WITH_SHOW(chassis_version, 0444, DMI_CHASSIS_VERSION); | |
57 | DEFINE_DMI_ATTR_WITH_SHOW(chassis_serial, 0400, DMI_CHASSIS_SERIAL); | |
58 | DEFINE_DMI_ATTR_WITH_SHOW(chassis_asset_tag, 0444, DMI_CHASSIS_ASSET_TAG); | |
59 | ||
60 | static void ascii_filter(char *d, const char *s) | |
61 | { | |
62 | /* Filter out characters we don't want to see in the modalias string */ | |
63 | for (; *s; s++) | |
64 | if (*s > ' ' && *s < 127 && *s != ':') | |
65 | *(d++) = *s; | |
66 | ||
67 | *d = 0; | |
68 | } | |
69 | ||
70 | static ssize_t get_modalias(char *buffer, size_t buffer_size) | |
71 | { | |
72 | static const struct mafield { | |
73 | const char *prefix; | |
74 | int field; | |
75 | } fields[] = { | |
76 | { "bvn", DMI_BIOS_VENDOR }, | |
77 | { "bvr", DMI_BIOS_VERSION }, | |
78 | { "bd", DMI_BIOS_DATE }, | |
79 | { "svn", DMI_SYS_VENDOR }, | |
80 | { "pn", DMI_PRODUCT_NAME }, | |
81 | { "pvr", DMI_PRODUCT_VERSION }, | |
82 | { "rvn", DMI_BOARD_VENDOR }, | |
83 | { "rn", DMI_BOARD_NAME }, | |
84 | { "rvr", DMI_BOARD_VERSION }, | |
85 | { "cvn", DMI_CHASSIS_VENDOR }, | |
86 | { "ct", DMI_CHASSIS_TYPE }, | |
87 | { "cvr", DMI_CHASSIS_VERSION }, | |
88 | { NULL, DMI_NONE } | |
89 | }; | |
90 | ||
91 | ssize_t l, left; | |
92 | char *p; | |
93 | const struct mafield *f; | |
94 | ||
95 | strcpy(buffer, "dmi"); | |
96 | p = buffer + 3; left = buffer_size - 4; | |
97 | ||
98 | for (f = fields; f->prefix && left > 0; f++) { | |
99 | const char *c; | |
100 | char *t; | |
101 | ||
102 | c = dmi_get_system_info(f->field); | |
103 | if (!c) | |
104 | continue; | |
105 | ||
106 | t = kmalloc(strlen(c) + 1, GFP_KERNEL); | |
107 | if (!t) | |
108 | break; | |
109 | ascii_filter(t, c); | |
110 | l = scnprintf(p, left, ":%s%s", f->prefix, t); | |
111 | kfree(t); | |
112 | ||
113 | p += l; | |
114 | left -= l; | |
115 | } | |
116 | ||
117 | p[0] = ':'; | |
118 | p[1] = 0; | |
119 | ||
120 | return p - buffer + 1; | |
121 | } | |
122 | ||
123 | static ssize_t sys_dmi_modalias_show(struct device *dev, | |
124 | struct device_attribute *attr, char *page) | |
125 | { | |
126 | ssize_t r; | |
127 | r = get_modalias(page, PAGE_SIZE-1); | |
128 | page[r] = '\n'; | |
129 | page[r+1] = 0; | |
130 | return r+1; | |
131 | } | |
132 | ||
34b51f39 JD |
133 | static struct device_attribute sys_dmi_modalias_attr = |
134 | __ATTR(modalias, 0444, sys_dmi_modalias_show, NULL); | |
4f5c791a LP |
135 | |
136 | static struct attribute *sys_dmi_attributes[DMI_STRING_MAX+2]; | |
137 | ||
138 | static struct attribute_group sys_dmi_attribute_group = { | |
139 | .attrs = sys_dmi_attributes, | |
140 | }; | |
141 | ||
a4dbd674 | 142 | static const struct attribute_group* sys_dmi_attribute_groups[] = { |
4f5c791a LP |
143 | &sys_dmi_attribute_group, |
144 | NULL | |
145 | }; | |
146 | ||
7eff2e7a | 147 | static int dmi_dev_uevent(struct device *dev, struct kobj_uevent_env *env) |
4f5c791a | 148 | { |
7eff2e7a KS |
149 | ssize_t len; |
150 | ||
151 | if (add_uevent_var(env, "MODALIAS=")) | |
152 | return -ENOMEM; | |
153 | len = get_modalias(&env->buf[env->buflen - 1], | |
154 | sizeof(env->buf) - env->buflen); | |
155 | if (len >= (sizeof(env->buf) - env->buflen)) | |
156 | return -ENOMEM; | |
157 | env->buflen += len; | |
4f5c791a LP |
158 | return 0; |
159 | } | |
160 | ||
161 | static struct class dmi_class = { | |
162 | .name = "dmi", | |
163 | .dev_release = (void(*)(struct device *)) kfree, | |
164 | .dev_uevent = dmi_dev_uevent, | |
165 | }; | |
166 | ||
167 | static struct device *dmi_dev; | |
168 | ||
169 | /* Initialization */ | |
170 | ||
171 | #define ADD_DMI_ATTR(_name, _field) \ | |
172 | if (dmi_get_system_info(_field)) \ | |
63744756 | 173 | sys_dmi_attributes[i++] = &sys_dmi_##_name##_attr.dev_attr.attr; |
4f5c791a | 174 | |
ce8c628a JD |
175 | /* In a separate function to keep gcc 3.2 happy - do NOT merge this in |
176 | dmi_id_init! */ | |
177 | static void __init dmi_id_init_attr_table(void) | |
4f5c791a | 178 | { |
ce8c628a | 179 | int i; |
4f5c791a LP |
180 | |
181 | /* Not necessarily all DMI fields are available on all | |
182 | * systems, hence let's built an attribute table of just | |
183 | * what's available */ | |
184 | i = 0; | |
185 | ADD_DMI_ATTR(bios_vendor, DMI_BIOS_VENDOR); | |
186 | ADD_DMI_ATTR(bios_version, DMI_BIOS_VERSION); | |
187 | ADD_DMI_ATTR(bios_date, DMI_BIOS_DATE); | |
188 | ADD_DMI_ATTR(sys_vendor, DMI_SYS_VENDOR); | |
189 | ADD_DMI_ATTR(product_name, DMI_PRODUCT_NAME); | |
190 | ADD_DMI_ATTR(product_version, DMI_PRODUCT_VERSION); | |
191 | ADD_DMI_ATTR(product_serial, DMI_PRODUCT_SERIAL); | |
192 | ADD_DMI_ATTR(product_uuid, DMI_PRODUCT_UUID); | |
193 | ADD_DMI_ATTR(board_vendor, DMI_BOARD_VENDOR); | |
194 | ADD_DMI_ATTR(board_name, DMI_BOARD_NAME); | |
195 | ADD_DMI_ATTR(board_version, DMI_BOARD_VERSION); | |
196 | ADD_DMI_ATTR(board_serial, DMI_BOARD_SERIAL); | |
197 | ADD_DMI_ATTR(board_asset_tag, DMI_BOARD_ASSET_TAG); | |
198 | ADD_DMI_ATTR(chassis_vendor, DMI_CHASSIS_VENDOR); | |
199 | ADD_DMI_ATTR(chassis_type, DMI_CHASSIS_TYPE); | |
200 | ADD_DMI_ATTR(chassis_version, DMI_CHASSIS_VERSION); | |
201 | ADD_DMI_ATTR(chassis_serial, DMI_CHASSIS_SERIAL); | |
202 | ADD_DMI_ATTR(chassis_asset_tag, DMI_CHASSIS_ASSET_TAG); | |
203 | sys_dmi_attributes[i++] = &sys_dmi_modalias_attr.attr; | |
ce8c628a JD |
204 | } |
205 | ||
206 | static int __init dmi_id_init(void) | |
207 | { | |
208 | int ret; | |
209 | ||
210 | if (!dmi_available) | |
211 | return -ENODEV; | |
212 | ||
213 | dmi_id_init_attr_table(); | |
4f5c791a LP |
214 | |
215 | ret = class_register(&dmi_class); | |
216 | if (ret) | |
217 | return ret; | |
218 | ||
219 | dmi_dev = kzalloc(sizeof(*dmi_dev), GFP_KERNEL); | |
220 | if (!dmi_dev) { | |
221 | ret = -ENOMEM; | |
222 | goto fail_class_unregister; | |
223 | } | |
224 | ||
225 | dmi_dev->class = &dmi_class; | |
6ff4dd36 | 226 | dev_set_name(dmi_dev, "id"); |
4f5c791a LP |
227 | dmi_dev->groups = sys_dmi_attribute_groups; |
228 | ||
229 | ret = device_register(dmi_dev); | |
230 | if (ret) | |
231 | goto fail_class_unregister; | |
232 | ||
233 | return 0; | |
234 | ||
235 | fail_class_unregister: | |
236 | ||
237 | class_unregister(&dmi_class); | |
238 | ||
239 | return ret; | |
240 | } | |
241 | ||
242 | arch_initcall(dmi_id_init); |