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