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> | |
5a0e3ad6 | 14 | #include <linux/slab.h> |
4f5c791a | 15 | |
63744756 JD |
16 | struct dmi_device_attribute{ |
17 | struct device_attribute dev_attr; | |
18 | int field; | |
19 | }; | |
20 | #define to_dmi_dev_attr(_dev_attr) \ | |
21 | container_of(_dev_attr, struct dmi_device_attribute, dev_attr) | |
22 | ||
63744756 JD |
23 | static ssize_t sys_dmi_field_show(struct device *dev, |
24 | struct device_attribute *attr, | |
25 | char *page) | |
26 | { | |
27 | int field = to_dmi_dev_attr(attr)->field; | |
28 | ssize_t len; | |
29 | len = scnprintf(page, PAGE_SIZE, "%s\n", dmi_get_system_info(field)); | |
30 | page[len-1] = '\n'; | |
31 | return len; | |
32 | } | |
33 | ||
34 | #define DMI_ATTR(_name, _mode, _show, _field) \ | |
35 | { .dev_attr = __ATTR(_name, _mode, _show, NULL), \ | |
36 | .field = _field } | |
37 | ||
38 | #define DEFINE_DMI_ATTR_WITH_SHOW(_name, _mode, _field) \ | |
39 | static struct dmi_device_attribute sys_dmi_##_name##_attr = \ | |
40 | DMI_ATTR(_name, _mode, sys_dmi_field_show, _field); | |
4f5c791a LP |
41 | |
42 | DEFINE_DMI_ATTR_WITH_SHOW(bios_vendor, 0444, DMI_BIOS_VENDOR); | |
43 | DEFINE_DMI_ATTR_WITH_SHOW(bios_version, 0444, DMI_BIOS_VERSION); | |
44 | DEFINE_DMI_ATTR_WITH_SHOW(bios_date, 0444, DMI_BIOS_DATE); | |
45 | DEFINE_DMI_ATTR_WITH_SHOW(sys_vendor, 0444, DMI_SYS_VENDOR); | |
46 | DEFINE_DMI_ATTR_WITH_SHOW(product_name, 0444, DMI_PRODUCT_NAME); | |
47 | DEFINE_DMI_ATTR_WITH_SHOW(product_version, 0444, DMI_PRODUCT_VERSION); | |
48 | DEFINE_DMI_ATTR_WITH_SHOW(product_serial, 0400, DMI_PRODUCT_SERIAL); | |
49 | DEFINE_DMI_ATTR_WITH_SHOW(product_uuid, 0400, DMI_PRODUCT_UUID); | |
50 | DEFINE_DMI_ATTR_WITH_SHOW(board_vendor, 0444, DMI_BOARD_VENDOR); | |
51 | DEFINE_DMI_ATTR_WITH_SHOW(board_name, 0444, DMI_BOARD_NAME); | |
52 | DEFINE_DMI_ATTR_WITH_SHOW(board_version, 0444, DMI_BOARD_VERSION); | |
53 | DEFINE_DMI_ATTR_WITH_SHOW(board_serial, 0400, DMI_BOARD_SERIAL); | |
54 | DEFINE_DMI_ATTR_WITH_SHOW(board_asset_tag, 0444, DMI_BOARD_ASSET_TAG); | |
55 | DEFINE_DMI_ATTR_WITH_SHOW(chassis_vendor, 0444, DMI_CHASSIS_VENDOR); | |
56 | DEFINE_DMI_ATTR_WITH_SHOW(chassis_type, 0444, DMI_CHASSIS_TYPE); | |
57 | DEFINE_DMI_ATTR_WITH_SHOW(chassis_version, 0444, DMI_CHASSIS_VERSION); | |
58 | DEFINE_DMI_ATTR_WITH_SHOW(chassis_serial, 0400, DMI_CHASSIS_SERIAL); | |
59 | DEFINE_DMI_ATTR_WITH_SHOW(chassis_asset_tag, 0444, DMI_CHASSIS_ASSET_TAG); | |
60 | ||
61 | static void ascii_filter(char *d, const char *s) | |
62 | { | |
63 | /* Filter out characters we don't want to see in the modalias string */ | |
64 | for (; *s; s++) | |
65 | if (*s > ' ' && *s < 127 && *s != ':') | |
66 | *(d++) = *s; | |
67 | ||
68 | *d = 0; | |
69 | } | |
70 | ||
71 | static ssize_t get_modalias(char *buffer, size_t buffer_size) | |
72 | { | |
73 | static const struct mafield { | |
74 | const char *prefix; | |
75 | int field; | |
76 | } fields[] = { | |
77 | { "bvn", DMI_BIOS_VENDOR }, | |
78 | { "bvr", DMI_BIOS_VERSION }, | |
79 | { "bd", DMI_BIOS_DATE }, | |
80 | { "svn", DMI_SYS_VENDOR }, | |
81 | { "pn", DMI_PRODUCT_NAME }, | |
82 | { "pvr", DMI_PRODUCT_VERSION }, | |
83 | { "rvn", DMI_BOARD_VENDOR }, | |
84 | { "rn", DMI_BOARD_NAME }, | |
85 | { "rvr", DMI_BOARD_VERSION }, | |
86 | { "cvn", DMI_CHASSIS_VENDOR }, | |
87 | { "ct", DMI_CHASSIS_TYPE }, | |
88 | { "cvr", DMI_CHASSIS_VERSION }, | |
89 | { NULL, DMI_NONE } | |
90 | }; | |
91 | ||
92 | ssize_t l, left; | |
93 | char *p; | |
94 | const struct mafield *f; | |
95 | ||
96 | strcpy(buffer, "dmi"); | |
97 | p = buffer + 3; left = buffer_size - 4; | |
98 | ||
99 | for (f = fields; f->prefix && left > 0; f++) { | |
100 | const char *c; | |
101 | char *t; | |
102 | ||
103 | c = dmi_get_system_info(f->field); | |
104 | if (!c) | |
105 | continue; | |
106 | ||
107 | t = kmalloc(strlen(c) + 1, GFP_KERNEL); | |
108 | if (!t) | |
109 | break; | |
110 | ascii_filter(t, c); | |
111 | l = scnprintf(p, left, ":%s%s", f->prefix, t); | |
112 | kfree(t); | |
113 | ||
114 | p += l; | |
115 | left -= l; | |
116 | } | |
117 | ||
118 | p[0] = ':'; | |
119 | p[1] = 0; | |
120 | ||
121 | return p - buffer + 1; | |
122 | } | |
123 | ||
124 | static ssize_t sys_dmi_modalias_show(struct device *dev, | |
125 | struct device_attribute *attr, char *page) | |
126 | { | |
127 | ssize_t r; | |
128 | r = get_modalias(page, PAGE_SIZE-1); | |
129 | page[r] = '\n'; | |
130 | page[r+1] = 0; | |
131 | return r+1; | |
132 | } | |
133 | ||
34b51f39 JD |
134 | static struct device_attribute sys_dmi_modalias_attr = |
135 | __ATTR(modalias, 0444, sys_dmi_modalias_show, NULL); | |
4f5c791a LP |
136 | |
137 | static struct attribute *sys_dmi_attributes[DMI_STRING_MAX+2]; | |
138 | ||
139 | static struct attribute_group sys_dmi_attribute_group = { | |
140 | .attrs = sys_dmi_attributes, | |
141 | }; | |
142 | ||
a4dbd674 | 143 | static const struct attribute_group* sys_dmi_attribute_groups[] = { |
4f5c791a LP |
144 | &sys_dmi_attribute_group, |
145 | NULL | |
146 | }; | |
147 | ||
7eff2e7a | 148 | static int dmi_dev_uevent(struct device *dev, struct kobj_uevent_env *env) |
4f5c791a | 149 | { |
7eff2e7a KS |
150 | ssize_t len; |
151 | ||
152 | if (add_uevent_var(env, "MODALIAS=")) | |
153 | return -ENOMEM; | |
154 | len = get_modalias(&env->buf[env->buflen - 1], | |
155 | sizeof(env->buf) - env->buflen); | |
156 | if (len >= (sizeof(env->buf) - env->buflen)) | |
157 | return -ENOMEM; | |
158 | env->buflen += len; | |
4f5c791a LP |
159 | return 0; |
160 | } | |
161 | ||
162 | static struct class dmi_class = { | |
163 | .name = "dmi", | |
164 | .dev_release = (void(*)(struct device *)) kfree, | |
165 | .dev_uevent = dmi_dev_uevent, | |
166 | }; | |
167 | ||
168 | static struct device *dmi_dev; | |
169 | ||
170 | /* Initialization */ | |
171 | ||
172 | #define ADD_DMI_ATTR(_name, _field) \ | |
173 | if (dmi_get_system_info(_field)) \ | |
63744756 | 174 | sys_dmi_attributes[i++] = &sys_dmi_##_name##_attr.dev_attr.attr; |
4f5c791a | 175 | |
ce8c628a JD |
176 | /* In a separate function to keep gcc 3.2 happy - do NOT merge this in |
177 | dmi_id_init! */ | |
178 | static void __init dmi_id_init_attr_table(void) | |
4f5c791a | 179 | { |
ce8c628a | 180 | int i; |
4f5c791a LP |
181 | |
182 | /* Not necessarily all DMI fields are available on all | |
183 | * systems, hence let's built an attribute table of just | |
184 | * what's available */ | |
185 | i = 0; | |
186 | ADD_DMI_ATTR(bios_vendor, DMI_BIOS_VENDOR); | |
187 | ADD_DMI_ATTR(bios_version, DMI_BIOS_VERSION); | |
188 | ADD_DMI_ATTR(bios_date, DMI_BIOS_DATE); | |
189 | ADD_DMI_ATTR(sys_vendor, DMI_SYS_VENDOR); | |
190 | ADD_DMI_ATTR(product_name, DMI_PRODUCT_NAME); | |
191 | ADD_DMI_ATTR(product_version, DMI_PRODUCT_VERSION); | |
192 | ADD_DMI_ATTR(product_serial, DMI_PRODUCT_SERIAL); | |
193 | ADD_DMI_ATTR(product_uuid, DMI_PRODUCT_UUID); | |
194 | ADD_DMI_ATTR(board_vendor, DMI_BOARD_VENDOR); | |
195 | ADD_DMI_ATTR(board_name, DMI_BOARD_NAME); | |
196 | ADD_DMI_ATTR(board_version, DMI_BOARD_VERSION); | |
197 | ADD_DMI_ATTR(board_serial, DMI_BOARD_SERIAL); | |
198 | ADD_DMI_ATTR(board_asset_tag, DMI_BOARD_ASSET_TAG); | |
199 | ADD_DMI_ATTR(chassis_vendor, DMI_CHASSIS_VENDOR); | |
200 | ADD_DMI_ATTR(chassis_type, DMI_CHASSIS_TYPE); | |
201 | ADD_DMI_ATTR(chassis_version, DMI_CHASSIS_VERSION); | |
202 | ADD_DMI_ATTR(chassis_serial, DMI_CHASSIS_SERIAL); | |
203 | ADD_DMI_ATTR(chassis_asset_tag, DMI_CHASSIS_ASSET_TAG); | |
204 | sys_dmi_attributes[i++] = &sys_dmi_modalias_attr.attr; | |
ce8c628a JD |
205 | } |
206 | ||
207 | static int __init dmi_id_init(void) | |
208 | { | |
209 | int ret; | |
210 | ||
211 | if (!dmi_available) | |
212 | return -ENODEV; | |
213 | ||
214 | dmi_id_init_attr_table(); | |
4f5c791a LP |
215 | |
216 | ret = class_register(&dmi_class); | |
217 | if (ret) | |
218 | return ret; | |
219 | ||
220 | dmi_dev = kzalloc(sizeof(*dmi_dev), GFP_KERNEL); | |
221 | if (!dmi_dev) { | |
222 | ret = -ENOMEM; | |
223 | goto fail_class_unregister; | |
224 | } | |
225 | ||
226 | dmi_dev->class = &dmi_class; | |
6ff4dd36 | 227 | dev_set_name(dmi_dev, "id"); |
4f5c791a LP |
228 | dmi_dev->groups = sys_dmi_attribute_groups; |
229 | ||
230 | ret = device_register(dmi_dev); | |
231 | if (ret) | |
5b232f75 | 232 | goto fail_free_dmi_dev; |
4f5c791a LP |
233 | |
234 | return 0; | |
235 | ||
5b232f75 AL |
236 | fail_free_dmi_dev: |
237 | kfree(dmi_dev); | |
4f5c791a LP |
238 | fail_class_unregister: |
239 | ||
240 | class_unregister(&dmi_class); | |
241 | ||
242 | return ret; | |
243 | } | |
244 | ||
245 | arch_initcall(dmi_id_init); |