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