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/autoconf.h> 15 16 #define DEFINE_DMI_ATTR(_name, _mode, _show) \ 17 static struct device_attribute sys_dmi_##_name##_attr = \ 18 __ATTR(_name, _mode, _show, NULL); 19 20 #define DEFINE_DMI_ATTR_WITH_SHOW(_name, _mode, _field) \ 21 static ssize_t sys_dmi_##_name##_show(struct device *dev, \ 22 struct device_attribute *attr, \ 23 char *page) \ 24 { \ 25 ssize_t len; \ 26 len = scnprintf(page, PAGE_SIZE, "%s\n", dmi_get_system_info(_field)); \ 27 page[len-1] = '\n'; \ 28 return len; \ 29 } \ 30 DEFINE_DMI_ATTR(_name, _mode, sys_dmi_##_name##_show); 31 32 DEFINE_DMI_ATTR_WITH_SHOW(bios_vendor, 0444, DMI_BIOS_VENDOR); 33 DEFINE_DMI_ATTR_WITH_SHOW(bios_version, 0444, DMI_BIOS_VERSION); 34 DEFINE_DMI_ATTR_WITH_SHOW(bios_date, 0444, DMI_BIOS_DATE); 35 DEFINE_DMI_ATTR_WITH_SHOW(sys_vendor, 0444, DMI_SYS_VENDOR); 36 DEFINE_DMI_ATTR_WITH_SHOW(product_name, 0444, DMI_PRODUCT_NAME); 37 DEFINE_DMI_ATTR_WITH_SHOW(product_version, 0444, DMI_PRODUCT_VERSION); 38 DEFINE_DMI_ATTR_WITH_SHOW(product_serial, 0400, DMI_PRODUCT_SERIAL); 39 DEFINE_DMI_ATTR_WITH_SHOW(product_uuid, 0400, DMI_PRODUCT_UUID); 40 DEFINE_DMI_ATTR_WITH_SHOW(board_vendor, 0444, DMI_BOARD_VENDOR); 41 DEFINE_DMI_ATTR_WITH_SHOW(board_name, 0444, DMI_BOARD_NAME); 42 DEFINE_DMI_ATTR_WITH_SHOW(board_version, 0444, DMI_BOARD_VERSION); 43 DEFINE_DMI_ATTR_WITH_SHOW(board_serial, 0400, DMI_BOARD_SERIAL); 44 DEFINE_DMI_ATTR_WITH_SHOW(board_asset_tag, 0444, DMI_BOARD_ASSET_TAG); 45 DEFINE_DMI_ATTR_WITH_SHOW(chassis_vendor, 0444, DMI_CHASSIS_VENDOR); 46 DEFINE_DMI_ATTR_WITH_SHOW(chassis_type, 0444, DMI_CHASSIS_TYPE); 47 DEFINE_DMI_ATTR_WITH_SHOW(chassis_version, 0444, DMI_CHASSIS_VERSION); 48 DEFINE_DMI_ATTR_WITH_SHOW(chassis_serial, 0400, DMI_CHASSIS_SERIAL); 49 DEFINE_DMI_ATTR_WITH_SHOW(chassis_asset_tag, 0444, DMI_CHASSIS_ASSET_TAG); 50 51 static void ascii_filter(char *d, const char *s) 52 { 53 /* Filter out characters we don't want to see in the modalias string */ 54 for (; *s; s++) 55 if (*s > ' ' && *s < 127 && *s != ':') 56 *(d++) = *s; 57 58 *d = 0; 59 } 60 61 static ssize_t get_modalias(char *buffer, size_t buffer_size) 62 { 63 static const struct mafield { 64 const char *prefix; 65 int field; 66 } fields[] = { 67 { "bvn", DMI_BIOS_VENDOR }, 68 { "bvr", DMI_BIOS_VERSION }, 69 { "bd", DMI_BIOS_DATE }, 70 { "svn", DMI_SYS_VENDOR }, 71 { "pn", DMI_PRODUCT_NAME }, 72 { "pvr", DMI_PRODUCT_VERSION }, 73 { "rvn", DMI_BOARD_VENDOR }, 74 { "rn", DMI_BOARD_NAME }, 75 { "rvr", DMI_BOARD_VERSION }, 76 { "cvn", DMI_CHASSIS_VENDOR }, 77 { "ct", DMI_CHASSIS_TYPE }, 78 { "cvr", DMI_CHASSIS_VERSION }, 79 { NULL, DMI_NONE } 80 }; 81 82 ssize_t l, left; 83 char *p; 84 const struct mafield *f; 85 86 strcpy(buffer, "dmi"); 87 p = buffer + 3; left = buffer_size - 4; 88 89 for (f = fields; f->prefix && left > 0; f++) { 90 const char *c; 91 char *t; 92 93 c = dmi_get_system_info(f->field); 94 if (!c) 95 continue; 96 97 t = kmalloc(strlen(c) + 1, GFP_KERNEL); 98 if (!t) 99 break; 100 ascii_filter(t, c); 101 l = scnprintf(p, left, ":%s%s", f->prefix, t); 102 kfree(t); 103 104 p += l; 105 left -= l; 106 } 107 108 p[0] = ':'; 109 p[1] = 0; 110 111 return p - buffer + 1; 112 } 113 114 static ssize_t sys_dmi_modalias_show(struct device *dev, 115 struct device_attribute *attr, char *page) 116 { 117 ssize_t r; 118 r = get_modalias(page, PAGE_SIZE-1); 119 page[r] = '\n'; 120 page[r+1] = 0; 121 return r+1; 122 } 123 124 DEFINE_DMI_ATTR(modalias, 0444, sys_dmi_modalias_show); 125 126 static struct attribute *sys_dmi_attributes[DMI_STRING_MAX+2]; 127 128 static struct attribute_group sys_dmi_attribute_group = { 129 .attrs = sys_dmi_attributes, 130 }; 131 132 static struct attribute_group* sys_dmi_attribute_groups[] = { 133 &sys_dmi_attribute_group, 134 NULL 135 }; 136 137 static int dmi_dev_uevent(struct device *dev, char **envp, 138 int num_envp, char *buffer, int buffer_size) 139 { 140 strcpy(buffer, "MODALIAS="); 141 get_modalias(buffer+9, buffer_size-9); 142 envp[0] = buffer; 143 envp[1] = NULL; 144 145 return 0; 146 } 147 148 static struct class dmi_class = { 149 .name = "dmi", 150 .dev_release = (void(*)(struct device *)) kfree, 151 .dev_uevent = dmi_dev_uevent, 152 }; 153 154 static struct device *dmi_dev; 155 156 /* Initialization */ 157 158 #define ADD_DMI_ATTR(_name, _field) \ 159 if (dmi_get_system_info(_field)) \ 160 sys_dmi_attributes[i++] = & sys_dmi_##_name##_attr.attr; 161 162 extern int dmi_available; 163 164 static int __init dmi_id_init(void) 165 { 166 int ret, i; 167 168 if (!dmi_available) 169 return -ENODEV; 170 171 /* Not necessarily all DMI fields are available on all 172 * systems, hence let's built an attribute table of just 173 * what's available */ 174 i = 0; 175 ADD_DMI_ATTR(bios_vendor, DMI_BIOS_VENDOR); 176 ADD_DMI_ATTR(bios_version, DMI_BIOS_VERSION); 177 ADD_DMI_ATTR(bios_date, DMI_BIOS_DATE); 178 ADD_DMI_ATTR(sys_vendor, DMI_SYS_VENDOR); 179 ADD_DMI_ATTR(product_name, DMI_PRODUCT_NAME); 180 ADD_DMI_ATTR(product_version, DMI_PRODUCT_VERSION); 181 ADD_DMI_ATTR(product_serial, DMI_PRODUCT_SERIAL); 182 ADD_DMI_ATTR(product_uuid, DMI_PRODUCT_UUID); 183 ADD_DMI_ATTR(board_vendor, DMI_BOARD_VENDOR); 184 ADD_DMI_ATTR(board_name, DMI_BOARD_NAME); 185 ADD_DMI_ATTR(board_version, DMI_BOARD_VERSION); 186 ADD_DMI_ATTR(board_serial, DMI_BOARD_SERIAL); 187 ADD_DMI_ATTR(board_asset_tag, DMI_BOARD_ASSET_TAG); 188 ADD_DMI_ATTR(chassis_vendor, DMI_CHASSIS_VENDOR); 189 ADD_DMI_ATTR(chassis_type, DMI_CHASSIS_TYPE); 190 ADD_DMI_ATTR(chassis_version, DMI_CHASSIS_VERSION); 191 ADD_DMI_ATTR(chassis_serial, DMI_CHASSIS_SERIAL); 192 ADD_DMI_ATTR(chassis_asset_tag, DMI_CHASSIS_ASSET_TAG); 193 sys_dmi_attributes[i++] = &sys_dmi_modalias_attr.attr; 194 195 ret = class_register(&dmi_class); 196 if (ret) 197 return ret; 198 199 dmi_dev = kzalloc(sizeof(*dmi_dev), GFP_KERNEL); 200 if (!dmi_dev) { 201 ret = -ENOMEM; 202 goto fail_class_unregister; 203 } 204 205 dmi_dev->class = &dmi_class; 206 strcpy(dmi_dev->bus_id, "id"); 207 dmi_dev->groups = sys_dmi_attribute_groups; 208 209 ret = device_register(dmi_dev); 210 if (ret) 211 goto fail_class_unregister; 212 213 return 0; 214 215 fail_class_unregister: 216 217 class_unregister(&dmi_class); 218 219 return ret; 220 } 221 222 arch_initcall(dmi_id_init); 223