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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
16struct 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
23static 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) \
39static struct dmi_device_attribute sys_dmi_##_name##_attr = \
40 DMI_ATTR(_name, _mode, sys_dmi_field_show, _field);
41
42DEFINE_DMI_ATTR_WITH_SHOW(bios_vendor, 0444, DMI_BIOS_VENDOR);
43DEFINE_DMI_ATTR_WITH_SHOW(bios_version, 0444, DMI_BIOS_VERSION);
44DEFINE_DMI_ATTR_WITH_SHOW(bios_date, 0444, DMI_BIOS_DATE);
45DEFINE_DMI_ATTR_WITH_SHOW(sys_vendor, 0444, DMI_SYS_VENDOR);
46DEFINE_DMI_ATTR_WITH_SHOW(product_name, 0444, DMI_PRODUCT_NAME);
47DEFINE_DMI_ATTR_WITH_SHOW(product_version, 0444, DMI_PRODUCT_VERSION);
48DEFINE_DMI_ATTR_WITH_SHOW(product_serial, 0400, DMI_PRODUCT_SERIAL);
49DEFINE_DMI_ATTR_WITH_SHOW(product_uuid, 0400, DMI_PRODUCT_UUID);
50DEFINE_DMI_ATTR_WITH_SHOW(product_family, 0444, DMI_PRODUCT_FAMILY);
51DEFINE_DMI_ATTR_WITH_SHOW(board_vendor, 0444, DMI_BOARD_VENDOR);
52DEFINE_DMI_ATTR_WITH_SHOW(board_name, 0444, DMI_BOARD_NAME);
53DEFINE_DMI_ATTR_WITH_SHOW(board_version, 0444, DMI_BOARD_VERSION);
54DEFINE_DMI_ATTR_WITH_SHOW(board_serial, 0400, DMI_BOARD_SERIAL);
55DEFINE_DMI_ATTR_WITH_SHOW(board_asset_tag, 0444, DMI_BOARD_ASSET_TAG);
56DEFINE_DMI_ATTR_WITH_SHOW(chassis_vendor, 0444, DMI_CHASSIS_VENDOR);
57DEFINE_DMI_ATTR_WITH_SHOW(chassis_type, 0444, DMI_CHASSIS_TYPE);
58DEFINE_DMI_ATTR_WITH_SHOW(chassis_version, 0444, DMI_CHASSIS_VERSION);
59DEFINE_DMI_ATTR_WITH_SHOW(chassis_serial, 0400, DMI_CHASSIS_SERIAL);
60DEFINE_DMI_ATTR_WITH_SHOW(chassis_asset_tag, 0444, DMI_CHASSIS_ASSET_TAG);
61
62static void ascii_filter(char *d, const char *s)
63{
64
65 for (; *s; s++)
66 if (*s > ' ' && *s < 127 && *s != ':')
67 *(d++) = *s;
68
69 *d = 0;
70}
71
72static ssize_t get_modalias(char *buffer, size_t buffer_size)
73{
74 static const struct mafield {
75 const char *prefix;
76 int field;
77 } fields[] = {
78 { "bvn", DMI_BIOS_VENDOR },
79 { "bvr", DMI_BIOS_VERSION },
80 { "bd", DMI_BIOS_DATE },
81 { "svn", DMI_SYS_VENDOR },
82 { "pn", DMI_PRODUCT_NAME },
83 { "pvr", DMI_PRODUCT_VERSION },
84 { "rvn", DMI_BOARD_VENDOR },
85 { "rn", DMI_BOARD_NAME },
86 { "rvr", DMI_BOARD_VERSION },
87 { "cvn", DMI_CHASSIS_VENDOR },
88 { "ct", DMI_CHASSIS_TYPE },
89 { "cvr", DMI_CHASSIS_VERSION },
90 { NULL, DMI_NONE }
91 };
92
93 ssize_t l, left;
94 char *p;
95 const struct mafield *f;
96
97 strcpy(buffer, "dmi");
98 p = buffer + 3; left = buffer_size - 4;
99
100 for (f = fields; f->prefix && left > 0; f++) {
101 const char *c;
102 char *t;
103
104 c = dmi_get_system_info(f->field);
105 if (!c)
106 continue;
107
108 t = kmalloc(strlen(c) + 1, GFP_KERNEL);
109 if (!t)
110 break;
111 ascii_filter(t, c);
112 l = scnprintf(p, left, ":%s%s", f->prefix, t);
113 kfree(t);
114
115 p += l;
116 left -= l;
117 }
118
119 p[0] = ':';
120 p[1] = 0;
121
122 return p - buffer + 1;
123}
124
125static ssize_t sys_dmi_modalias_show(struct device *dev,
126 struct device_attribute *attr, char *page)
127{
128 ssize_t r;
129 r = get_modalias(page, PAGE_SIZE-1);
130 page[r] = '\n';
131 page[r+1] = 0;
132 return r+1;
133}
134
135static struct device_attribute sys_dmi_modalias_attr =
136 __ATTR(modalias, 0444, sys_dmi_modalias_show, NULL);
137
138static struct attribute *sys_dmi_attributes[DMI_STRING_MAX+2];
139
140static struct attribute_group sys_dmi_attribute_group = {
141 .attrs = sys_dmi_attributes,
142};
143
144static const struct attribute_group* sys_dmi_attribute_groups[] = {
145 &sys_dmi_attribute_group,
146 NULL
147};
148
149static int dmi_dev_uevent(struct device *dev, struct kobj_uevent_env *env)
150{
151 ssize_t len;
152
153 if (add_uevent_var(env, "MODALIAS="))
154 return -ENOMEM;
155 len = get_modalias(&env->buf[env->buflen - 1],
156 sizeof(env->buf) - env->buflen);
157 if (len >= (sizeof(env->buf) - env->buflen))
158 return -ENOMEM;
159 env->buflen += len;
160 return 0;
161}
162
163static struct class dmi_class = {
164 .name = "dmi",
165 .dev_release = (void(*)(struct device *)) kfree,
166 .dev_uevent = dmi_dev_uevent,
167};
168
169static struct device *dmi_dev;
170
171
172
173#define ADD_DMI_ATTR(_name, _field) \
174 if (dmi_get_system_info(_field)) \
175 sys_dmi_attributes[i++] = &sys_dmi_##_name##_attr.dev_attr.attr;
176
177
178
179static void __init dmi_id_init_attr_table(void)
180{
181 int i;
182
183
184
185
186 i = 0;
187 ADD_DMI_ATTR(bios_vendor, DMI_BIOS_VENDOR);
188 ADD_DMI_ATTR(bios_version, DMI_BIOS_VERSION);
189 ADD_DMI_ATTR(bios_date, DMI_BIOS_DATE);
190 ADD_DMI_ATTR(sys_vendor, DMI_SYS_VENDOR);
191 ADD_DMI_ATTR(product_name, DMI_PRODUCT_NAME);
192 ADD_DMI_ATTR(product_version, DMI_PRODUCT_VERSION);
193 ADD_DMI_ATTR(product_serial, DMI_PRODUCT_SERIAL);
194 ADD_DMI_ATTR(product_uuid, DMI_PRODUCT_UUID);
195 ADD_DMI_ATTR(product_family, DMI_PRODUCT_FAMILY);
196 ADD_DMI_ATTR(board_vendor, DMI_BOARD_VENDOR);
197 ADD_DMI_ATTR(board_name, DMI_BOARD_NAME);
198 ADD_DMI_ATTR(board_version, DMI_BOARD_VERSION);
199 ADD_DMI_ATTR(board_serial, DMI_BOARD_SERIAL);
200 ADD_DMI_ATTR(board_asset_tag, DMI_BOARD_ASSET_TAG);
201 ADD_DMI_ATTR(chassis_vendor, DMI_CHASSIS_VENDOR);
202 ADD_DMI_ATTR(chassis_type, DMI_CHASSIS_TYPE);
203 ADD_DMI_ATTR(chassis_version, DMI_CHASSIS_VERSION);
204 ADD_DMI_ATTR(chassis_serial, DMI_CHASSIS_SERIAL);
205 ADD_DMI_ATTR(chassis_asset_tag, DMI_CHASSIS_ASSET_TAG);
206 sys_dmi_attributes[i++] = &sys_dmi_modalias_attr.attr;
207}
208
209static int __init dmi_id_init(void)
210{
211 int ret;
212
213 if (!dmi_available)
214 return -ENODEV;
215
216 dmi_id_init_attr_table();
217
218 ret = class_register(&dmi_class);
219 if (ret)
220 return ret;
221
222 dmi_dev = kzalloc(sizeof(*dmi_dev), GFP_KERNEL);
223 if (!dmi_dev) {
224 ret = -ENOMEM;
225 goto fail_class_unregister;
226 }
227
228 dmi_dev->class = &dmi_class;
229 dev_set_name(dmi_dev, "id");
230 dmi_dev->groups = sys_dmi_attribute_groups;
231
232 ret = device_register(dmi_dev);
233 if (ret)
234 goto fail_put_dmi_dev;
235
236 return 0;
237
238fail_put_dmi_dev:
239 put_device(dmi_dev);
240
241fail_class_unregister:
242 class_unregister(&dmi_class);
243
244 return ret;
245}
246
247arch_initcall(dmi_id_init);
248
