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