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 | ||
16 | #define DEFINE_DMI_ATTR(_name, _mode, _show) \ | |
17 | static struct device_attribute sys_dmi_##_name##_attr = \ | |
18 | __ATTR(_name, _mode, _show, NULL); | |
19 | ||
20 | #define DEFINE_DMI_ATTR_WITH_SHOW(_name, _mode, _field) \ | |
21 | static 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 | } \ | |
30 | DEFINE_DMI_ATTR(_name, _mode, sys_dmi_##_name##_show); | |
31 | ||
32 | DEFINE_DMI_ATTR_WITH_SHOW(bios_vendor, 0444, DMI_BIOS_VENDOR); | |
33 | DEFINE_DMI_ATTR_WITH_SHOW(bios_version, 0444, DMI_BIOS_VERSION); | |
34 | DEFINE_DMI_ATTR_WITH_SHOW(bios_date, 0444, DMI_BIOS_DATE); | |
35 | DEFINE_DMI_ATTR_WITH_SHOW(sys_vendor, 0444, DMI_SYS_VENDOR); | |
36 | DEFINE_DMI_ATTR_WITH_SHOW(product_name, 0444, DMI_PRODUCT_NAME); | |
37 | DEFINE_DMI_ATTR_WITH_SHOW(product_version, 0444, DMI_PRODUCT_VERSION); | |
38 | DEFINE_DMI_ATTR_WITH_SHOW(product_serial, 0400, DMI_PRODUCT_SERIAL); | |
39 | DEFINE_DMI_ATTR_WITH_SHOW(product_uuid, 0400, DMI_PRODUCT_UUID); | |
40 | DEFINE_DMI_ATTR_WITH_SHOW(board_vendor, 0444, DMI_BOARD_VENDOR); | |
41 | DEFINE_DMI_ATTR_WITH_SHOW(board_name, 0444, DMI_BOARD_NAME); | |
42 | DEFINE_DMI_ATTR_WITH_SHOW(board_version, 0444, DMI_BOARD_VERSION); | |
43 | DEFINE_DMI_ATTR_WITH_SHOW(board_serial, 0400, DMI_BOARD_SERIAL); | |
44 | DEFINE_DMI_ATTR_WITH_SHOW(board_asset_tag, 0444, DMI_BOARD_ASSET_TAG); | |
45 | DEFINE_DMI_ATTR_WITH_SHOW(chassis_vendor, 0444, DMI_CHASSIS_VENDOR); | |
46 | DEFINE_DMI_ATTR_WITH_SHOW(chassis_type, 0444, DMI_CHASSIS_TYPE); | |
47 | DEFINE_DMI_ATTR_WITH_SHOW(chassis_version, 0444, DMI_CHASSIS_VERSION); | |
48 | DEFINE_DMI_ATTR_WITH_SHOW(chassis_serial, 0400, DMI_CHASSIS_SERIAL); | |
49 | DEFINE_DMI_ATTR_WITH_SHOW(chassis_asset_tag, 0444, DMI_CHASSIS_ASSET_TAG); | |
50 | ||
51 | static 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 | ||
61 | static 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 | ||
114 | static 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 | ||
124 | DEFINE_DMI_ATTR(modalias, 0444, sys_dmi_modalias_show); | |
125 | ||
126 | static struct attribute *sys_dmi_attributes[DMI_STRING_MAX+2]; | |
127 | ||
128 | static struct attribute_group sys_dmi_attribute_group = { | |
129 | .attrs = sys_dmi_attributes, | |
130 | }; | |
131 | ||
132 | static struct attribute_group* sys_dmi_attribute_groups[] = { | |
133 | &sys_dmi_attribute_group, | |
134 | NULL | |
135 | }; | |
136 | ||
137 | static int dmi_dev_uevent(struct device *dev, char **envp, | |
138 | int num_envp, char *buffer, int buffer_size) | |
139 | { | |
140 | strcpy(buffer, "MODALIAS="); | |
141 | get_modalias(buffer+9, buffer_size-9); | |
142 | envp[0] = buffer; | |
143 | envp[1] = NULL; | |
144 | ||
145 | return 0; | |
146 | } | |
147 | ||
148 | static struct class dmi_class = { | |
149 | .name = "dmi", | |
150 | .dev_release = (void(*)(struct device *)) kfree, | |
151 | .dev_uevent = dmi_dev_uevent, | |
152 | }; | |
153 | ||
154 | static struct device *dmi_dev; | |
155 | ||
156 | /* Initialization */ | |
157 | ||
158 | #define ADD_DMI_ATTR(_name, _field) \ | |
159 | if (dmi_get_system_info(_field)) \ | |
160 | sys_dmi_attributes[i++] = & sys_dmi_##_name##_attr.attr; | |
161 | ||
162 | extern int dmi_available; | |
163 | ||
164 | static int __init dmi_id_init(void) | |
165 | { | |
166 | int ret, i; | |
167 | ||
168 | if (!dmi_available) | |
169 | return -ENODEV; | |
170 | ||
171 | /* Not necessarily all DMI fields are available on all | |
172 | * systems, hence let's built an attribute table of just | |
173 | * what's available */ | |
174 | i = 0; | |
175 | ADD_DMI_ATTR(bios_vendor, DMI_BIOS_VENDOR); | |
176 | ADD_DMI_ATTR(bios_version, DMI_BIOS_VERSION); | |
177 | ADD_DMI_ATTR(bios_date, DMI_BIOS_DATE); | |
178 | ADD_DMI_ATTR(sys_vendor, DMI_SYS_VENDOR); | |
179 | ADD_DMI_ATTR(product_name, DMI_PRODUCT_NAME); | |
180 | ADD_DMI_ATTR(product_version, DMI_PRODUCT_VERSION); | |
181 | ADD_DMI_ATTR(product_serial, DMI_PRODUCT_SERIAL); | |
182 | ADD_DMI_ATTR(product_uuid, DMI_PRODUCT_UUID); | |
183 | ADD_DMI_ATTR(board_vendor, DMI_BOARD_VENDOR); | |
184 | ADD_DMI_ATTR(board_name, DMI_BOARD_NAME); | |
185 | ADD_DMI_ATTR(board_version, DMI_BOARD_VERSION); | |
186 | ADD_DMI_ATTR(board_serial, DMI_BOARD_SERIAL); | |
187 | ADD_DMI_ATTR(board_asset_tag, DMI_BOARD_ASSET_TAG); | |
188 | ADD_DMI_ATTR(chassis_vendor, DMI_CHASSIS_VENDOR); | |
189 | ADD_DMI_ATTR(chassis_type, DMI_CHASSIS_TYPE); | |
190 | ADD_DMI_ATTR(chassis_version, DMI_CHASSIS_VERSION); | |
191 | ADD_DMI_ATTR(chassis_serial, DMI_CHASSIS_SERIAL); | |
192 | ADD_DMI_ATTR(chassis_asset_tag, DMI_CHASSIS_ASSET_TAG); | |
193 | sys_dmi_attributes[i++] = &sys_dmi_modalias_attr.attr; | |
194 | ||
195 | ret = class_register(&dmi_class); | |
196 | if (ret) | |
197 | return ret; | |
198 | ||
199 | dmi_dev = kzalloc(sizeof(*dmi_dev), GFP_KERNEL); | |
200 | if (!dmi_dev) { | |
201 | ret = -ENOMEM; | |
202 | goto fail_class_unregister; | |
203 | } | |
204 | ||
205 | dmi_dev->class = &dmi_class; | |
206 | strcpy(dmi_dev->bus_id, "id"); | |
207 | dmi_dev->groups = sys_dmi_attribute_groups; | |
208 | ||
209 | ret = device_register(dmi_dev); | |
210 | if (ret) | |
211 | goto fail_class_unregister; | |
212 | ||
213 | return 0; | |
214 | ||
215 | fail_class_unregister: | |
216 | ||
217 | class_unregister(&dmi_class); | |
218 | ||
219 | return ret; | |
220 | } | |
221 | ||
222 | arch_initcall(dmi_id_init); |