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 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 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); 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); 45 DEFINE_DMI_ATTR_WITH_SHOW(product_name, 0444, DMI_PRODUCT_NAME); 46 DEFINE_DMI_ATTR_WITH_SHOW(product_version, 0444, DMI_PRODUCT_VERSION); 47 DEFINE_DMI_ATTR_WITH_SHOW(product_serial, 0400, DMI_PRODUCT_SERIAL); 48 DEFINE_DMI_ATTR_WITH_SHOW(product_uuid, 0400, DMI_PRODUCT_UUID); 49 DEFINE_DMI_ATTR_WITH_SHOW(product_sku, 0444, DMI_PRODUCT_SKU); 50 DEFINE_DMI_ATTR_WITH_SHOW(product_family, 0444, DMI_PRODUCT_FAMILY); 51 DEFINE_DMI_ATTR_WITH_SHOW(board_vendor, 0444, DMI_BOARD_VENDOR); 52 DEFINE_DMI_ATTR_WITH_SHOW(board_name, 0444, DMI_BOARD_NAME); 53 DEFINE_DMI_ATTR_WITH_SHOW(board_version, 0444, DMI_BOARD_VERSION); 54 DEFINE_DMI_ATTR_WITH_SHOW(board_serial, 0400, DMI_BOARD_SERIAL); 55 DEFINE_DMI_ATTR_WITH_SHOW(board_asset_tag, 0444, DMI_BOARD_ASSET_TAG); 56 DEFINE_DMI_ATTR_WITH_SHOW(chassis_vendor, 0444, DMI_CHASSIS_VENDOR); 57 DEFINE_DMI_ATTR_WITH_SHOW(chassis_type, 0444, DMI_CHASSIS_TYPE); 58 DEFINE_DMI_ATTR_WITH_SHOW(chassis_version, 0444, DMI_CHASSIS_VERSION); 59 DEFINE_DMI_ATTR_WITH_SHOW(chassis_serial, 0400, DMI_CHASSIS_SERIAL); 60 DEFINE_DMI_ATTR_WITH_SHOW(chassis_asset_tag, 0444, DMI_CHASSIS_ASSET_TAG); 61 62 static void ascii_filter(char *d, const char *s) 63 { 64 /* Filter out characters we don't want to see in the modalias string */ 65 for (; *s; s++) 66 if (*s > ' ' && *s < 127 && *s != ':') 67 *(d++) = *s; 68 69 *d = 0; 70 } 71 72 static ssize_t get_modalias(char *buffer, size_t buffer_size) 73 { 74 static const struct mafield { 75 const char *prefix; 76 int field; 77 } fields[] = { 78 { "bvn", DMI_BIOS_VENDOR }, 79 { "bvr", DMI_BIOS_VERSION }, 80 { "bd", DMI_BIOS_DATE }, 81 { "svn", DMI_SYS_VENDOR }, 82 { "pn", DMI_PRODUCT_NAME }, 83 { "pvr", DMI_PRODUCT_VERSION }, 84 { "rvn", DMI_BOARD_VENDOR }, 85 { "rn", DMI_BOARD_NAME }, 86 { "rvr", DMI_BOARD_VERSION }, 87 { "cvn", DMI_CHASSIS_VENDOR }, 88 { "ct", DMI_CHASSIS_TYPE }, 89 { "cvr", DMI_CHASSIS_VERSION }, 90 { NULL, DMI_NONE } 91 }; 92 93 ssize_t l, left; 94 char *p; 95 const struct mafield *f; 96 97 strcpy(buffer, "dmi"); 98 p = buffer + 3; left = buffer_size - 4; 99 100 for (f = fields; f->prefix && left > 0; f++) { 101 const char *c; 102 char *t; 103 104 c = dmi_get_system_info(f->field); 105 if (!c) 106 continue; 107 108 t = kmalloc(strlen(c) + 1, GFP_KERNEL); 109 if (!t) 110 break; 111 ascii_filter(t, c); 112 l = scnprintf(p, left, ":%s%s", f->prefix, t); 113 kfree(t); 114 115 p += l; 116 left -= l; 117 } 118 119 p[0] = ':'; 120 p[1] = 0; 121 122 return p - buffer + 1; 123 } 124 125 static ssize_t sys_dmi_modalias_show(struct device *dev, 126 struct device_attribute *attr, char *page) 127 { 128 ssize_t r; 129 r = get_modalias(page, PAGE_SIZE-1); 130 page[r] = '\n'; 131 page[r+1] = 0; 132 return r+1; 133 } 134 135 static struct device_attribute sys_dmi_modalias_attr = 136 __ATTR(modalias, 0444, sys_dmi_modalias_show, NULL); 137 138 static struct attribute *sys_dmi_attributes[DMI_STRING_MAX+2]; 139 140 static struct attribute_group sys_dmi_attribute_group = { 141 .attrs = sys_dmi_attributes, 142 }; 143 144 static const struct attribute_group* sys_dmi_attribute_groups[] = { 145 &sys_dmi_attribute_group, 146 NULL 147 }; 148 149 static int dmi_dev_uevent(struct device *dev, struct kobj_uevent_env *env) 150 { 151 ssize_t len; 152 153 if (add_uevent_var(env, "MODALIAS=")) 154 return -ENOMEM; 155 len = get_modalias(&env->buf[env->buflen - 1], 156 sizeof(env->buf) - env->buflen); 157 if (len >= (sizeof(env->buf) - env->buflen)) 158 return -ENOMEM; 159 env->buflen += len; 160 return 0; 161 } 162 163 static struct class dmi_class = { 164 .name = "dmi", 165 .dev_release = (void(*)(struct device *)) kfree, 166 .dev_uevent = dmi_dev_uevent, 167 }; 168 169 static struct device *dmi_dev; 170 171 /* Initialization */ 172 173 #define ADD_DMI_ATTR(_name, _field) \ 174 if (dmi_get_system_info(_field)) \ 175 sys_dmi_attributes[i++] = &sys_dmi_##_name##_attr.dev_attr.attr; 176 177 /* In a separate function to keep gcc 3.2 happy - do NOT merge this in 178 dmi_id_init! */ 179 static void __init dmi_id_init_attr_table(void) 180 { 181 int i; 182 183 /* Not necessarily all DMI fields are available on all 184 * systems, hence let's built an attribute table of just 185 * what's available */ 186 i = 0; 187 ADD_DMI_ATTR(bios_vendor, DMI_BIOS_VENDOR); 188 ADD_DMI_ATTR(bios_version, DMI_BIOS_VERSION); 189 ADD_DMI_ATTR(bios_date, DMI_BIOS_DATE); 190 ADD_DMI_ATTR(sys_vendor, DMI_SYS_VENDOR); 191 ADD_DMI_ATTR(product_name, DMI_PRODUCT_NAME); 192 ADD_DMI_ATTR(product_version, DMI_PRODUCT_VERSION); 193 ADD_DMI_ATTR(product_serial, DMI_PRODUCT_SERIAL); 194 ADD_DMI_ATTR(product_uuid, DMI_PRODUCT_UUID); 195 ADD_DMI_ATTR(product_family, DMI_PRODUCT_FAMILY); 196 ADD_DMI_ATTR(product_sku, DMI_PRODUCT_SKU); 197 ADD_DMI_ATTR(board_vendor, DMI_BOARD_VENDOR); 198 ADD_DMI_ATTR(board_name, DMI_BOARD_NAME); 199 ADD_DMI_ATTR(board_version, DMI_BOARD_VERSION); 200 ADD_DMI_ATTR(board_serial, DMI_BOARD_SERIAL); 201 ADD_DMI_ATTR(board_asset_tag, DMI_BOARD_ASSET_TAG); 202 ADD_DMI_ATTR(chassis_vendor, DMI_CHASSIS_VENDOR); 203 ADD_DMI_ATTR(chassis_type, DMI_CHASSIS_TYPE); 204 ADD_DMI_ATTR(chassis_version, DMI_CHASSIS_VERSION); 205 ADD_DMI_ATTR(chassis_serial, DMI_CHASSIS_SERIAL); 206 ADD_DMI_ATTR(chassis_asset_tag, DMI_CHASSIS_ASSET_TAG); 207 sys_dmi_attributes[i++] = &sys_dmi_modalias_attr.attr; 208 } 209 210 static int __init dmi_id_init(void) 211 { 212 int ret; 213 214 if (!dmi_available) 215 return -ENODEV; 216 217 dmi_id_init_attr_table(); 218 219 ret = class_register(&dmi_class); 220 if (ret) 221 return ret; 222 223 dmi_dev = kzalloc(sizeof(*dmi_dev), GFP_KERNEL); 224 if (!dmi_dev) { 225 ret = -ENOMEM; 226 goto fail_class_unregister; 227 } 228 229 dmi_dev->class = &dmi_class; 230 dev_set_name(dmi_dev, "id"); 231 dmi_dev->groups = sys_dmi_attribute_groups; 232 233 ret = device_register(dmi_dev); 234 if (ret) 235 goto fail_put_dmi_dev; 236 237 return 0; 238 239 fail_put_dmi_dev: 240 put_device(dmi_dev); 241 242 fail_class_unregister: 243 class_unregister(&dmi_class); 244 245 return ret; 246 } 247 248 arch_initcall(dmi_id_init); 249