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/slab.h>
15
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
sys_dmi_field_show(struct device * dev,struct device_attribute * attr,char * page)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);
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(product_sku, 0444, DMI_PRODUCT_SKU);
51 DEFINE_DMI_ATTR_WITH_SHOW(product_family, 0444, DMI_PRODUCT_FAMILY);
52 DEFINE_DMI_ATTR_WITH_SHOW(board_vendor, 0444, DMI_BOARD_VENDOR);
53 DEFINE_DMI_ATTR_WITH_SHOW(board_name, 0444, DMI_BOARD_NAME);
54 DEFINE_DMI_ATTR_WITH_SHOW(board_version, 0444, DMI_BOARD_VERSION);
55 DEFINE_DMI_ATTR_WITH_SHOW(board_serial, 0400, DMI_BOARD_SERIAL);
56 DEFINE_DMI_ATTR_WITH_SHOW(board_asset_tag, 0444, DMI_BOARD_ASSET_TAG);
57 DEFINE_DMI_ATTR_WITH_SHOW(chassis_vendor, 0444, DMI_CHASSIS_VENDOR);
58 DEFINE_DMI_ATTR_WITH_SHOW(chassis_type, 0444, DMI_CHASSIS_TYPE);
59 DEFINE_DMI_ATTR_WITH_SHOW(chassis_version, 0444, DMI_CHASSIS_VERSION);
60 DEFINE_DMI_ATTR_WITH_SHOW(chassis_serial, 0400, DMI_CHASSIS_SERIAL);
61 DEFINE_DMI_ATTR_WITH_SHOW(chassis_asset_tag, 0444, DMI_CHASSIS_ASSET_TAG);
62
ascii_filter(char * d,const char * s)63 static void ascii_filter(char *d, const char *s)
64 {
65 /* Filter out characters we don't want to see in the modalias string */
66 for (; *s; s++)
67 if (*s > ' ' && *s < 127 && *s != ':')
68 *(d++) = *s;
69
70 *d = 0;
71 }
72
get_modalias(char * buffer,size_t buffer_size)73 static ssize_t get_modalias(char *buffer, size_t buffer_size)
74 {
75 static const struct mafield {
76 const char *prefix;
77 int field;
78 } fields[] = {
79 { "bvn", DMI_BIOS_VENDOR },
80 { "bvr", DMI_BIOS_VERSION },
81 { "bd", DMI_BIOS_DATE },
82 { "svn", DMI_SYS_VENDOR },
83 { "pn", DMI_PRODUCT_NAME },
84 { "pvr", DMI_PRODUCT_VERSION },
85 { "rvn", DMI_BOARD_VENDOR },
86 { "rn", DMI_BOARD_NAME },
87 { "rvr", DMI_BOARD_VERSION },
88 { "cvn", DMI_CHASSIS_VENDOR },
89 { "ct", DMI_CHASSIS_TYPE },
90 { "cvr", DMI_CHASSIS_VERSION },
91 { NULL, DMI_NONE }
92 };
93
94 ssize_t l, left;
95 char *p;
96 const struct mafield *f;
97
98 strcpy(buffer, "dmi");
99 p = buffer + 3; left = buffer_size - 4;
100
101 for (f = fields; f->prefix && left > 0; f++) {
102 const char *c;
103 char *t;
104
105 c = dmi_get_system_info(f->field);
106 if (!c)
107 continue;
108
109 t = kmalloc(strlen(c) + 1, GFP_KERNEL);
110 if (!t)
111 break;
112 ascii_filter(t, c);
113 l = scnprintf(p, left, ":%s%s", f->prefix, t);
114 kfree(t);
115
116 p += l;
117 left -= l;
118 }
119
120 p[0] = ':';
121 p[1] = 0;
122
123 return p - buffer + 1;
124 }
125
sys_dmi_modalias_show(struct device * dev,struct device_attribute * attr,char * page)126 static ssize_t sys_dmi_modalias_show(struct device *dev,
127 struct device_attribute *attr, char *page)
128 {
129 ssize_t r;
130 r = get_modalias(page, PAGE_SIZE-1);
131 page[r] = '\n';
132 page[r+1] = 0;
133 return r+1;
134 }
135
136 static struct device_attribute sys_dmi_modalias_attr =
137 __ATTR(modalias, 0444, sys_dmi_modalias_show, NULL);
138
139 static struct attribute *sys_dmi_attributes[DMI_STRING_MAX+2];
140
141 static struct attribute_group sys_dmi_attribute_group = {
142 .attrs = sys_dmi_attributes,
143 };
144
145 static const struct attribute_group* sys_dmi_attribute_groups[] = {
146 &sys_dmi_attribute_group,
147 NULL
148 };
149
dmi_dev_uevent(struct device * dev,struct kobj_uevent_env * env)150 static int dmi_dev_uevent(struct device *dev, struct kobj_uevent_env *env)
151 {
152 ssize_t len;
153
154 if (add_uevent_var(env, "MODALIAS="))
155 return -ENOMEM;
156 len = get_modalias(&env->buf[env->buflen - 1],
157 sizeof(env->buf) - env->buflen);
158 if (len >= (sizeof(env->buf) - env->buflen))
159 return -ENOMEM;
160 env->buflen += len;
161 return 0;
162 }
163
164 static struct class dmi_class = {
165 .name = "dmi",
166 .dev_release = (void(*)(struct device *)) kfree,
167 .dev_uevent = dmi_dev_uevent,
168 };
169
170 static struct device *dmi_dev;
171
172 /* Initialization */
173
174 #define ADD_DMI_ATTR(_name, _field) \
175 if (dmi_get_system_info(_field)) \
176 sys_dmi_attributes[i++] = &sys_dmi_##_name##_attr.dev_attr.attr;
177
178 /* In a separate function to keep gcc 3.2 happy - do NOT merge this in
179 dmi_id_init! */
dmi_id_init_attr_table(void)180 static void __init dmi_id_init_attr_table(void)
181 {
182 int i;
183
184 /* Not necessarily all DMI fields are available on all
185 * systems, hence let's built an attribute table of just
186 * what's available */
187 i = 0;
188 ADD_DMI_ATTR(bios_vendor, DMI_BIOS_VENDOR);
189 ADD_DMI_ATTR(bios_version, DMI_BIOS_VERSION);
190 ADD_DMI_ATTR(bios_date, DMI_BIOS_DATE);
191 ADD_DMI_ATTR(sys_vendor, DMI_SYS_VENDOR);
192 ADD_DMI_ATTR(product_name, DMI_PRODUCT_NAME);
193 ADD_DMI_ATTR(product_version, DMI_PRODUCT_VERSION);
194 ADD_DMI_ATTR(product_serial, DMI_PRODUCT_SERIAL);
195 ADD_DMI_ATTR(product_uuid, DMI_PRODUCT_UUID);
196 ADD_DMI_ATTR(product_family, DMI_PRODUCT_FAMILY);
197 ADD_DMI_ATTR(product_sku, DMI_PRODUCT_SKU);
198 ADD_DMI_ATTR(board_vendor, DMI_BOARD_VENDOR);
199 ADD_DMI_ATTR(board_name, DMI_BOARD_NAME);
200 ADD_DMI_ATTR(board_version, DMI_BOARD_VERSION);
201 ADD_DMI_ATTR(board_serial, DMI_BOARD_SERIAL);
202 ADD_DMI_ATTR(board_asset_tag, DMI_BOARD_ASSET_TAG);
203 ADD_DMI_ATTR(chassis_vendor, DMI_CHASSIS_VENDOR);
204 ADD_DMI_ATTR(chassis_type, DMI_CHASSIS_TYPE);
205 ADD_DMI_ATTR(chassis_version, DMI_CHASSIS_VERSION);
206 ADD_DMI_ATTR(chassis_serial, DMI_CHASSIS_SERIAL);
207 ADD_DMI_ATTR(chassis_asset_tag, DMI_CHASSIS_ASSET_TAG);
208 sys_dmi_attributes[i++] = &sys_dmi_modalias_attr.attr;
209 }
210
dmi_id_init(void)211 static int __init dmi_id_init(void)
212 {
213 int ret;
214
215 if (!dmi_available)
216 return -ENODEV;
217
218 dmi_id_init_attr_table();
219
220 ret = class_register(&dmi_class);
221 if (ret)
222 return ret;
223
224 dmi_dev = kzalloc(sizeof(*dmi_dev), GFP_KERNEL);
225 if (!dmi_dev) {
226 ret = -ENOMEM;
227 goto fail_class_unregister;
228 }
229
230 dmi_dev->class = &dmi_class;
231 dev_set_name(dmi_dev, "id");
232 dmi_dev->groups = sys_dmi_attribute_groups;
233
234 ret = device_register(dmi_dev);
235 if (ret)
236 goto fail_put_dmi_dev;
237
238 return 0;
239
240 fail_put_dmi_dev:
241 put_device(dmi_dev);
242
243 fail_class_unregister:
244 class_unregister(&dmi_class);
245
246 return ret;
247 }
248
249 arch_initcall(dmi_id_init);
250
