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Lennart Poettering4f5c7912007-05-08 22:07:02 +02001/*
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
16#define DEFINE_DMI_ATTR(_name, _mode, _show) \
17static struct device_attribute sys_dmi_##_name##_attr = \
18 __ATTR(_name, _mode, _show, NULL);
19
20#define DEFINE_DMI_ATTR_WITH_SHOW(_name, _mode, _field) \
21static ssize_t sys_dmi_##_name##_show(struct device *dev, \
22 struct device_attribute *attr, \
23 char *page) \
24{ \
25 ssize_t len; \
26 len = scnprintf(page, PAGE_SIZE, "%s\n", dmi_get_system_info(_field)); \
27 page[len-1] = '\n'; \
28 return len; \
29} \
30DEFINE_DMI_ATTR(_name, _mode, sys_dmi_##_name##_show);
31
32DEFINE_DMI_ATTR_WITH_SHOW(bios_vendor, 0444, DMI_BIOS_VENDOR);
33DEFINE_DMI_ATTR_WITH_SHOW(bios_version, 0444, DMI_BIOS_VERSION);
34DEFINE_DMI_ATTR_WITH_SHOW(bios_date, 0444, DMI_BIOS_DATE);
35DEFINE_DMI_ATTR_WITH_SHOW(sys_vendor, 0444, DMI_SYS_VENDOR);
36DEFINE_DMI_ATTR_WITH_SHOW(product_name, 0444, DMI_PRODUCT_NAME);
37DEFINE_DMI_ATTR_WITH_SHOW(product_version, 0444, DMI_PRODUCT_VERSION);
38DEFINE_DMI_ATTR_WITH_SHOW(product_serial, 0400, DMI_PRODUCT_SERIAL);
39DEFINE_DMI_ATTR_WITH_SHOW(product_uuid, 0400, DMI_PRODUCT_UUID);
40DEFINE_DMI_ATTR_WITH_SHOW(board_vendor, 0444, DMI_BOARD_VENDOR);
41DEFINE_DMI_ATTR_WITH_SHOW(board_name, 0444, DMI_BOARD_NAME);
42DEFINE_DMI_ATTR_WITH_SHOW(board_version, 0444, DMI_BOARD_VERSION);
43DEFINE_DMI_ATTR_WITH_SHOW(board_serial, 0400, DMI_BOARD_SERIAL);
44DEFINE_DMI_ATTR_WITH_SHOW(board_asset_tag, 0444, DMI_BOARD_ASSET_TAG);
45DEFINE_DMI_ATTR_WITH_SHOW(chassis_vendor, 0444, DMI_CHASSIS_VENDOR);
46DEFINE_DMI_ATTR_WITH_SHOW(chassis_type, 0444, DMI_CHASSIS_TYPE);
47DEFINE_DMI_ATTR_WITH_SHOW(chassis_version, 0444, DMI_CHASSIS_VERSION);
48DEFINE_DMI_ATTR_WITH_SHOW(chassis_serial, 0400, DMI_CHASSIS_SERIAL);
49DEFINE_DMI_ATTR_WITH_SHOW(chassis_asset_tag, 0444, DMI_CHASSIS_ASSET_TAG);
50
51static void ascii_filter(char *d, const char *s)
52{
53 /* Filter out characters we don't want to see in the modalias string */
54 for (; *s; s++)
55 if (*s > ' ' && *s < 127 && *s != ':')
56 *(d++) = *s;
57
58 *d = 0;
59}
60
61static ssize_t get_modalias(char *buffer, size_t buffer_size)
62{
63 static const struct mafield {
64 const char *prefix;
65 int field;
66 } fields[] = {
67 { "bvn", DMI_BIOS_VENDOR },
68 { "bvr", DMI_BIOS_VERSION },
69 { "bd", DMI_BIOS_DATE },
70 { "svn", DMI_SYS_VENDOR },
71 { "pn", DMI_PRODUCT_NAME },
72 { "pvr", DMI_PRODUCT_VERSION },
73 { "rvn", DMI_BOARD_VENDOR },
74 { "rn", DMI_BOARD_NAME },
75 { "rvr", DMI_BOARD_VERSION },
76 { "cvn", DMI_CHASSIS_VENDOR },
77 { "ct", DMI_CHASSIS_TYPE },
78 { "cvr", DMI_CHASSIS_VERSION },
79 { NULL, DMI_NONE }
80 };
81
82 ssize_t l, left;
83 char *p;
84 const struct mafield *f;
85
86 strcpy(buffer, "dmi");
87 p = buffer + 3; left = buffer_size - 4;
88
89 for (f = fields; f->prefix && left > 0; f++) {
90 const char *c;
91 char *t;
92
93 c = dmi_get_system_info(f->field);
94 if (!c)
95 continue;
96
97 t = kmalloc(strlen(c) + 1, GFP_KERNEL);
98 if (!t)
99 break;
100 ascii_filter(t, c);
101 l = scnprintf(p, left, ":%s%s", f->prefix, t);
102 kfree(t);
103
104 p += l;
105 left -= l;
106 }
107
108 p[0] = ':';
109 p[1] = 0;
110
111 return p - buffer + 1;
112}
113
114static ssize_t sys_dmi_modalias_show(struct device *dev,
115 struct device_attribute *attr, char *page)
116{
117 ssize_t r;
118 r = get_modalias(page, PAGE_SIZE-1);
119 page[r] = '\n';
120 page[r+1] = 0;
121 return r+1;
122}
123
124DEFINE_DMI_ATTR(modalias, 0444, sys_dmi_modalias_show);
125
126static struct attribute *sys_dmi_attributes[DMI_STRING_MAX+2];
127
128static struct attribute_group sys_dmi_attribute_group = {
129 .attrs = sys_dmi_attributes,
130};
131
132static struct attribute_group* sys_dmi_attribute_groups[] = {
133 &sys_dmi_attribute_group,
134 NULL
135};
136
Kay Sievers7eff2e72007-08-14 15:15:12 +0200137static int dmi_dev_uevent(struct device *dev, struct kobj_uevent_env *env)
Lennart Poettering4f5c7912007-05-08 22:07:02 +0200138{
Kay Sievers7eff2e72007-08-14 15:15:12 +0200139 ssize_t len;
Lennart Poettering4f5c7912007-05-08 22:07:02 +0200140
Kay Sievers7eff2e72007-08-14 15:15:12 +0200141 if (add_uevent_var(env, "MODALIAS="))
142 return -ENOMEM;
143 len = get_modalias(&env->buf[env->buflen - 1],
144 sizeof(env->buf) - env->buflen);
145 if (len >= (sizeof(env->buf) - env->buflen))
146 return -ENOMEM;
147 env->buflen += len;
Lennart Poettering4f5c7912007-05-08 22:07:02 +0200148 return 0;
149}
150
151static struct class dmi_class = {
152 .name = "dmi",
153 .dev_release = (void(*)(struct device *)) kfree,
154 .dev_uevent = dmi_dev_uevent,
155};
156
157static struct device *dmi_dev;
158
159/* Initialization */
160
161#define ADD_DMI_ATTR(_name, _field) \
162 if (dmi_get_system_info(_field)) \
163 sys_dmi_attributes[i++] = & sys_dmi_##_name##_attr.attr;
164
165extern int dmi_available;
166
167static int __init dmi_id_init(void)
168{
169 int ret, i;
170
171 if (!dmi_available)
172 return -ENODEV;
173
174 /* Not necessarily all DMI fields are available on all
175 * systems, hence let's built an attribute table of just
176 * what's available */
177 i = 0;
178 ADD_DMI_ATTR(bios_vendor, DMI_BIOS_VENDOR);
179 ADD_DMI_ATTR(bios_version, DMI_BIOS_VERSION);
180 ADD_DMI_ATTR(bios_date, DMI_BIOS_DATE);
181 ADD_DMI_ATTR(sys_vendor, DMI_SYS_VENDOR);
182 ADD_DMI_ATTR(product_name, DMI_PRODUCT_NAME);
183 ADD_DMI_ATTR(product_version, DMI_PRODUCT_VERSION);
184 ADD_DMI_ATTR(product_serial, DMI_PRODUCT_SERIAL);
185 ADD_DMI_ATTR(product_uuid, DMI_PRODUCT_UUID);
186 ADD_DMI_ATTR(board_vendor, DMI_BOARD_VENDOR);
187 ADD_DMI_ATTR(board_name, DMI_BOARD_NAME);
188 ADD_DMI_ATTR(board_version, DMI_BOARD_VERSION);
189 ADD_DMI_ATTR(board_serial, DMI_BOARD_SERIAL);
190 ADD_DMI_ATTR(board_asset_tag, DMI_BOARD_ASSET_TAG);
191 ADD_DMI_ATTR(chassis_vendor, DMI_CHASSIS_VENDOR);
192 ADD_DMI_ATTR(chassis_type, DMI_CHASSIS_TYPE);
193 ADD_DMI_ATTR(chassis_version, DMI_CHASSIS_VERSION);
194 ADD_DMI_ATTR(chassis_serial, DMI_CHASSIS_SERIAL);
195 ADD_DMI_ATTR(chassis_asset_tag, DMI_CHASSIS_ASSET_TAG);
196 sys_dmi_attributes[i++] = &sys_dmi_modalias_attr.attr;
197
198 ret = class_register(&dmi_class);
199 if (ret)
200 return ret;
201
202 dmi_dev = kzalloc(sizeof(*dmi_dev), GFP_KERNEL);
203 if (!dmi_dev) {
204 ret = -ENOMEM;
205 goto fail_class_unregister;
206 }
207
208 dmi_dev->class = &dmi_class;
209 strcpy(dmi_dev->bus_id, "id");
210 dmi_dev->groups = sys_dmi_attribute_groups;
211
212 ret = device_register(dmi_dev);
213 if (ret)
214 goto fail_class_unregister;
215
216 return 0;
217
218fail_class_unregister:
219
220 class_unregister(&dmi_class);
221
222 return ret;
223}
224
225arch_initcall(dmi_id_init);