drivers/firmware/dmi-id.c

   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_free_dmi_dev;
 233
 234         return 0;
 235
 236 fail_free_dmi_dev:
 237         kfree(dmi_dev);
 238 fail_class_unregister:
 239
 240         class_unregister(&dmi_class);
 241
 242         return ret;
 243 }
 244
 245 arch_initcall(dmi_id_init);