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