2 * Export SMBIOS/DMI info via sysfs to userspace
4 * Copyright 2007, Lennart Poettering
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>
16 struct dmi_device_attribute{
17 struct device_attribute dev_attr;
20 #define to_dmi_dev_attr(_dev_attr) \
21 container_of(_dev_attr, struct dmi_device_attribute, dev_attr)
23 #define DEFINE_DMI_ATTR(_name, _mode, _show) \
24 static struct device_attribute sys_dmi_##_name##_attr = \
25 __ATTR(_name, _mode, _show, NULL);
27 static ssize_t sys_dmi_field_show(struct device *dev,
28 struct device_attribute *attr,
31 int field = to_dmi_dev_attr(attr)->field;
33 len = scnprintf(page, PAGE_SIZE, "%s\n", dmi_get_system_info(field));
38 #define DMI_ATTR(_name, _mode, _show, _field) \
39 { .dev_attr = __ATTR(_name, _mode, _show, NULL), \
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);
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);
65 static void ascii_filter(char *d, const char *s)
67 /* Filter out characters we don't want to see in the modalias string */
69 if (*s > ' ' && *s < 127 && *s != ':')
75 static ssize_t get_modalias(char *buffer, size_t buffer_size)
77 static const struct mafield {
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 },
98 const struct mafield *f;
100 strcpy(buffer, "dmi");
101 p = buffer + 3; left = buffer_size - 4;
103 for (f = fields; f->prefix && left > 0; f++) {
107 c = dmi_get_system_info(f->field);
111 t = kmalloc(strlen(c) + 1, GFP_KERNEL);
115 l = scnprintf(p, left, ":%s%s", f->prefix, t);
125 return p - buffer + 1;
128 static ssize_t sys_dmi_modalias_show(struct device *dev,
129 struct device_attribute *attr, char *page)
132 r = get_modalias(page, PAGE_SIZE-1);
138 DEFINE_DMI_ATTR(modalias, 0444, sys_dmi_modalias_show);
140 static struct attribute *sys_dmi_attributes[DMI_STRING_MAX+2];
142 static struct attribute_group sys_dmi_attribute_group = {
143 .attrs = sys_dmi_attributes,
146 static struct attribute_group* sys_dmi_attribute_groups[] = {
147 &sys_dmi_attribute_group,
151 static int dmi_dev_uevent(struct device *dev, struct kobj_uevent_env *env)
155 if (add_uevent_var(env, "MODALIAS="))
157 len = get_modalias(&env->buf[env->buflen - 1],
158 sizeof(env->buf) - env->buflen);
159 if (len >= (sizeof(env->buf) - env->buflen))
165 static struct class dmi_class = {
167 .dev_release = (void(*)(struct device *)) kfree,
168 .dev_uevent = dmi_dev_uevent,
171 static struct device *dmi_dev;
175 #define ADD_DMI_ATTR(_name, _field) \
176 if (dmi_get_system_info(_field)) \
177 sys_dmi_attributes[i++] = &sys_dmi_##_name##_attr.dev_attr.attr;
179 extern int dmi_available;
181 static int __init dmi_id_init(void)
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 */
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;
212 ret = class_register(&dmi_class);
216 dmi_dev = kzalloc(sizeof(*dmi_dev), GFP_KERNEL);
219 goto fail_class_unregister;
222 dmi_dev->class = &dmi_class;
223 strcpy(dmi_dev->bus_id, "id");
224 dmi_dev->groups = sys_dmi_attribute_groups;
226 ret = device_register(dmi_dev);
228 goto fail_class_unregister;
232 fail_class_unregister:
234 class_unregister(&dmi_class);
239 arch_initcall(dmi_id_init);