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f50a7f3d | 1 | // SPDX-License-Identifier: GPL-2.0-only |
4f5c791a LP |
2 | /* |
3 | * Export SMBIOS/DMI info via sysfs to userspace | |
4 | * | |
5 | * Copyright 2007, Lennart Poettering | |
4f5c791a LP |
6 | */ |
7 | ||
8 | #include <linux/module.h> | |
9 | #include <linux/kernel.h> | |
10 | #include <linux/init.h> | |
11 | #include <linux/dmi.h> | |
12 | #include <linux/device.h> | |
5a0e3ad6 | 13 | #include <linux/slab.h> |
4f5c791a | 14 | |
63744756 JD |
15 | struct dmi_device_attribute{ |
16 | struct device_attribute dev_attr; | |
17 | int field; | |
18 | }; | |
19 | #define to_dmi_dev_attr(_dev_attr) \ | |
20 | container_of(_dev_attr, struct dmi_device_attribute, dev_attr) | |
21 | ||
63744756 JD |
22 | static ssize_t sys_dmi_field_show(struct device *dev, |
23 | struct device_attribute *attr, | |
24 | char *page) | |
25 | { | |
26 | int field = to_dmi_dev_attr(attr)->field; | |
27 | ssize_t len; | |
28 | len = scnprintf(page, PAGE_SIZE, "%s\n", dmi_get_system_info(field)); | |
29 | page[len-1] = '\n'; | |
30 | return len; | |
31 | } | |
32 | ||
33 | #define DMI_ATTR(_name, _mode, _show, _field) \ | |
34 | { .dev_attr = __ATTR(_name, _mode, _show, NULL), \ | |
35 | .field = _field } | |
36 | ||
37 | #define DEFINE_DMI_ATTR_WITH_SHOW(_name, _mode, _field) \ | |
38 | static struct dmi_device_attribute sys_dmi_##_name##_attr = \ | |
39 | DMI_ATTR(_name, _mode, sys_dmi_field_show, _field); | |
4f5c791a LP |
40 | |
41 | DEFINE_DMI_ATTR_WITH_SHOW(bios_vendor, 0444, DMI_BIOS_VENDOR); | |
42 | DEFINE_DMI_ATTR_WITH_SHOW(bios_version, 0444, DMI_BIOS_VERSION); | |
43 | DEFINE_DMI_ATTR_WITH_SHOW(bios_date, 0444, DMI_BIOS_DATE); | |
44 | DEFINE_DMI_ATTR_WITH_SHOW(sys_vendor, 0444, DMI_SYS_VENDOR); | |
f5152f4d EV |
45 | DEFINE_DMI_ATTR_WITH_SHOW(bios_release, 0444, DMI_BIOS_RELEASE); |
46 | DEFINE_DMI_ATTR_WITH_SHOW(ec_firmware_release, 0444, DMI_EC_FIRMWARE_RELEASE); | |
4f5c791a LP |
47 | DEFINE_DMI_ATTR_WITH_SHOW(product_name, 0444, DMI_PRODUCT_NAME); |
48 | DEFINE_DMI_ATTR_WITH_SHOW(product_version, 0444, DMI_PRODUCT_VERSION); | |
49 | DEFINE_DMI_ATTR_WITH_SHOW(product_serial, 0400, DMI_PRODUCT_SERIAL); | |
50 | DEFINE_DMI_ATTR_WITH_SHOW(product_uuid, 0400, DMI_PRODUCT_UUID); | |
b23908d3 | 51 | DEFINE_DMI_ATTR_WITH_SHOW(product_sku, 0444, DMI_PRODUCT_SKU); |
e0733e97 | 52 | DEFINE_DMI_ATTR_WITH_SHOW(product_family, 0444, DMI_PRODUCT_FAMILY); |
4f5c791a LP |
53 | DEFINE_DMI_ATTR_WITH_SHOW(board_vendor, 0444, DMI_BOARD_VENDOR); |
54 | DEFINE_DMI_ATTR_WITH_SHOW(board_name, 0444, DMI_BOARD_NAME); | |
55 | DEFINE_DMI_ATTR_WITH_SHOW(board_version, 0444, DMI_BOARD_VERSION); | |
56 | DEFINE_DMI_ATTR_WITH_SHOW(board_serial, 0400, DMI_BOARD_SERIAL); | |
57 | DEFINE_DMI_ATTR_WITH_SHOW(board_asset_tag, 0444, DMI_BOARD_ASSET_TAG); | |
58 | DEFINE_DMI_ATTR_WITH_SHOW(chassis_vendor, 0444, DMI_CHASSIS_VENDOR); | |
59 | DEFINE_DMI_ATTR_WITH_SHOW(chassis_type, 0444, DMI_CHASSIS_TYPE); | |
60 | DEFINE_DMI_ATTR_WITH_SHOW(chassis_version, 0444, DMI_CHASSIS_VERSION); | |
61 | DEFINE_DMI_ATTR_WITH_SHOW(chassis_serial, 0400, DMI_CHASSIS_SERIAL); | |
62 | DEFINE_DMI_ATTR_WITH_SHOW(chassis_asset_tag, 0444, DMI_CHASSIS_ASSET_TAG); | |
63 | ||
64 | static void ascii_filter(char *d, const char *s) | |
65 | { | |
66 | /* Filter out characters we don't want to see in the modalias string */ | |
67 | for (; *s; s++) | |
68 | if (*s > ' ' && *s < 127 && *s != ':') | |
69 | *(d++) = *s; | |
70 | ||
71 | *d = 0; | |
72 | } | |
73 | ||
74 | static ssize_t get_modalias(char *buffer, size_t buffer_size) | |
75 | { | |
f97a2103 HG |
76 | /* |
77 | * Note new fields need to be added at the end to keep compatibility | |
78 | * with udev's hwdb which does matches on "`cat dmi/id/modalias`*". | |
79 | */ | |
4f5c791a LP |
80 | static const struct mafield { |
81 | const char *prefix; | |
82 | int field; | |
83 | } fields[] = { | |
84 | { "bvn", DMI_BIOS_VENDOR }, | |
85 | { "bvr", DMI_BIOS_VERSION }, | |
86 | { "bd", DMI_BIOS_DATE }, | |
f5152f4d EV |
87 | { "br", DMI_BIOS_RELEASE }, |
88 | { "efr", DMI_EC_FIRMWARE_RELEASE }, | |
4f5c791a LP |
89 | { "svn", DMI_SYS_VENDOR }, |
90 | { "pn", DMI_PRODUCT_NAME }, | |
91 | { "pvr", DMI_PRODUCT_VERSION }, | |
92 | { "rvn", DMI_BOARD_VENDOR }, | |
93 | { "rn", DMI_BOARD_NAME }, | |
94 | { "rvr", DMI_BOARD_VERSION }, | |
95 | { "cvn", DMI_CHASSIS_VENDOR }, | |
96 | { "ct", DMI_CHASSIS_TYPE }, | |
97 | { "cvr", DMI_CHASSIS_VERSION }, | |
f97a2103 | 98 | { "sku", DMI_PRODUCT_SKU }, |
4f5c791a LP |
99 | { NULL, DMI_NONE } |
100 | }; | |
101 | ||
102 | ssize_t l, left; | |
103 | char *p; | |
104 | const struct mafield *f; | |
105 | ||
106 | strcpy(buffer, "dmi"); | |
107 | p = buffer + 3; left = buffer_size - 4; | |
108 | ||
109 | for (f = fields; f->prefix && left > 0; f++) { | |
110 | const char *c; | |
111 | char *t; | |
112 | ||
113 | c = dmi_get_system_info(f->field); | |
114 | if (!c) | |
115 | continue; | |
116 | ||
117 | t = kmalloc(strlen(c) + 1, GFP_KERNEL); | |
118 | if (!t) | |
119 | break; | |
120 | ascii_filter(t, c); | |
121 | l = scnprintf(p, left, ":%s%s", f->prefix, t); | |
122 | kfree(t); | |
123 | ||
124 | p += l; | |
125 | left -= l; | |
126 | } | |
127 | ||
128 | p[0] = ':'; | |
129 | p[1] = 0; | |
130 | ||
131 | return p - buffer + 1; | |
132 | } | |
133 | ||
134 | static ssize_t sys_dmi_modalias_show(struct device *dev, | |
135 | struct device_attribute *attr, char *page) | |
136 | { | |
137 | ssize_t r; | |
138 | r = get_modalias(page, PAGE_SIZE-1); | |
139 | page[r] = '\n'; | |
140 | page[r+1] = 0; | |
141 | return r+1; | |
142 | } | |
143 | ||
34b51f39 JD |
144 | static struct device_attribute sys_dmi_modalias_attr = |
145 | __ATTR(modalias, 0444, sys_dmi_modalias_show, NULL); | |
4f5c791a LP |
146 | |
147 | static struct attribute *sys_dmi_attributes[DMI_STRING_MAX+2]; | |
148 | ||
149 | static struct attribute_group sys_dmi_attribute_group = { | |
150 | .attrs = sys_dmi_attributes, | |
151 | }; | |
152 | ||
a4dbd674 | 153 | static const struct attribute_group* sys_dmi_attribute_groups[] = { |
4f5c791a LP |
154 | &sys_dmi_attribute_group, |
155 | NULL | |
156 | }; | |
157 | ||
23680f0b | 158 | static int dmi_dev_uevent(const struct device *dev, struct kobj_uevent_env *env) |
4f5c791a | 159 | { |
7eff2e7a KS |
160 | ssize_t len; |
161 | ||
162 | if (add_uevent_var(env, "MODALIAS=")) | |
163 | return -ENOMEM; | |
164 | len = get_modalias(&env->buf[env->buflen - 1], | |
165 | sizeof(env->buf) - env->buflen); | |
166 | if (len >= (sizeof(env->buf) - env->buflen)) | |
167 | return -ENOMEM; | |
168 | env->buflen += len; | |
4f5c791a LP |
169 | return 0; |
170 | } | |
171 | ||
cf770af5 AB |
172 | static void dmi_dev_release(struct device *dev) |
173 | { | |
174 | kfree(dev); | |
175 | } | |
176 | ||
4f5c791a LP |
177 | static struct class dmi_class = { |
178 | .name = "dmi", | |
cf770af5 | 179 | .dev_release = dmi_dev_release, |
4f5c791a LP |
180 | .dev_uevent = dmi_dev_uevent, |
181 | }; | |
182 | ||
183 | static struct device *dmi_dev; | |
184 | ||
185 | /* Initialization */ | |
186 | ||
187 | #define ADD_DMI_ATTR(_name, _field) \ | |
188 | if (dmi_get_system_info(_field)) \ | |
63744756 | 189 | sys_dmi_attributes[i++] = &sys_dmi_##_name##_attr.dev_attr.attr; |
4f5c791a | 190 | |
ce8c628a JD |
191 | /* In a separate function to keep gcc 3.2 happy - do NOT merge this in |
192 | dmi_id_init! */ | |
193 | static void __init dmi_id_init_attr_table(void) | |
4f5c791a | 194 | { |
ce8c628a | 195 | int i; |
4f5c791a LP |
196 | |
197 | /* Not necessarily all DMI fields are available on all | |
198 | * systems, hence let's built an attribute table of just | |
199 | * what's available */ | |
200 | i = 0; | |
201 | ADD_DMI_ATTR(bios_vendor, DMI_BIOS_VENDOR); | |
202 | ADD_DMI_ATTR(bios_version, DMI_BIOS_VERSION); | |
203 | ADD_DMI_ATTR(bios_date, DMI_BIOS_DATE); | |
f5152f4d EV |
204 | ADD_DMI_ATTR(bios_release, DMI_BIOS_RELEASE); |
205 | ADD_DMI_ATTR(ec_firmware_release, DMI_EC_FIRMWARE_RELEASE); | |
4f5c791a LP |
206 | ADD_DMI_ATTR(sys_vendor, DMI_SYS_VENDOR); |
207 | ADD_DMI_ATTR(product_name, DMI_PRODUCT_NAME); | |
208 | ADD_DMI_ATTR(product_version, DMI_PRODUCT_VERSION); | |
209 | ADD_DMI_ATTR(product_serial, DMI_PRODUCT_SERIAL); | |
210 | ADD_DMI_ATTR(product_uuid, DMI_PRODUCT_UUID); | |
e0733e97 | 211 | ADD_DMI_ATTR(product_family, DMI_PRODUCT_FAMILY); |
b23908d3 | 212 | ADD_DMI_ATTR(product_sku, DMI_PRODUCT_SKU); |
4f5c791a LP |
213 | ADD_DMI_ATTR(board_vendor, DMI_BOARD_VENDOR); |
214 | ADD_DMI_ATTR(board_name, DMI_BOARD_NAME); | |
215 | ADD_DMI_ATTR(board_version, DMI_BOARD_VERSION); | |
216 | ADD_DMI_ATTR(board_serial, DMI_BOARD_SERIAL); | |
217 | ADD_DMI_ATTR(board_asset_tag, DMI_BOARD_ASSET_TAG); | |
218 | ADD_DMI_ATTR(chassis_vendor, DMI_CHASSIS_VENDOR); | |
219 | ADD_DMI_ATTR(chassis_type, DMI_CHASSIS_TYPE); | |
220 | ADD_DMI_ATTR(chassis_version, DMI_CHASSIS_VERSION); | |
221 | ADD_DMI_ATTR(chassis_serial, DMI_CHASSIS_SERIAL); | |
222 | ADD_DMI_ATTR(chassis_asset_tag, DMI_CHASSIS_ASSET_TAG); | |
223 | sys_dmi_attributes[i++] = &sys_dmi_modalias_attr.attr; | |
ce8c628a JD |
224 | } |
225 | ||
226 | static int __init dmi_id_init(void) | |
227 | { | |
228 | int ret; | |
229 | ||
230 | if (!dmi_available) | |
231 | return -ENODEV; | |
232 | ||
233 | dmi_id_init_attr_table(); | |
4f5c791a LP |
234 | |
235 | ret = class_register(&dmi_class); | |
236 | if (ret) | |
237 | return ret; | |
238 | ||
239 | dmi_dev = kzalloc(sizeof(*dmi_dev), GFP_KERNEL); | |
240 | if (!dmi_dev) { | |
241 | ret = -ENOMEM; | |
242 | goto fail_class_unregister; | |
243 | } | |
244 | ||
245 | dmi_dev->class = &dmi_class; | |
6ff4dd36 | 246 | dev_set_name(dmi_dev, "id"); |
4f5c791a LP |
247 | dmi_dev->groups = sys_dmi_attribute_groups; |
248 | ||
249 | ret = device_register(dmi_dev); | |
250 | if (ret) | |
9b41b92b | 251 | goto fail_put_dmi_dev; |
4f5c791a LP |
252 | |
253 | return 0; | |
254 | ||
9b41b92b AH |
255 | fail_put_dmi_dev: |
256 | put_device(dmi_dev); | |
4f5c791a | 257 | |
9b41b92b | 258 | fail_class_unregister: |
4f5c791a LP |
259 | class_unregister(&dmi_class); |
260 | ||
261 | return ret; | |
262 | } | |
263 | ||
264 | arch_initcall(dmi_id_init); |