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