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/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, struct kobj_uevent_env *env)
 138 {
 139         ssize_t len;
 140
 141         if (add_uevent_var(env, "MODALIAS="))
 142                 return -ENOMEM;
 143         len = get_modalias(&env->buf[env->buflen - 1],
 144                            sizeof(env->buf) - env->buflen);
 145         if (len >= (sizeof(env->buf) - env->buflen))
 146                 return -ENOMEM;
 147         env->buflen += len;
 148         return 0;
 149 }
 150
 151 static struct class dmi_class = {
 152         .name = "dmi",
 153         .dev_release = (void(*)(struct device *)) kfree,
 154         .dev_uevent = dmi_dev_uevent,
 155 };
 156
 157 static struct device *dmi_dev;
 158
 159 /* Initialization */
 160
 161 #define ADD_DMI_ATTR(_name, _field) \
 162         if (dmi_get_system_info(_field)) \
 163                 sys_dmi_attributes[i++] = & sys_dmi_##_name##_attr.attr;
 164
 165 extern int dmi_available;
 166
 167 static int __init dmi_id_init(void)
 168 {
 169         int ret, i;
 170
 171         if (!dmi_available)
 172                 return -ENODEV;
 173
 174         /* Not necessarily all DMI fields are available on all
 175          * systems, hence let's built an attribute table of just
 176          * what's available */
 177         i = 0;
 178         ADD_DMI_ATTR(bios_vendor,       DMI_BIOS_VENDOR);
 179         ADD_DMI_ATTR(bios_version,      DMI_BIOS_VERSION);
 180         ADD_DMI_ATTR(bios_date,         DMI_BIOS_DATE);
 181         ADD_DMI_ATTR(sys_vendor,        DMI_SYS_VENDOR);
 182         ADD_DMI_ATTR(product_name,      DMI_PRODUCT_NAME);
 183         ADD_DMI_ATTR(product_version,   DMI_PRODUCT_VERSION);
 184         ADD_DMI_ATTR(product_serial,    DMI_PRODUCT_SERIAL);
 185         ADD_DMI_ATTR(product_uuid,      DMI_PRODUCT_UUID);
 186         ADD_DMI_ATTR(board_vendor,      DMI_BOARD_VENDOR);
 187         ADD_DMI_ATTR(board_name,        DMI_BOARD_NAME);
 188         ADD_DMI_ATTR(board_version,     DMI_BOARD_VERSION);
 189         ADD_DMI_ATTR(board_serial,      DMI_BOARD_SERIAL);
 190         ADD_DMI_ATTR(board_asset_tag,   DMI_BOARD_ASSET_TAG);
 191         ADD_DMI_ATTR(chassis_vendor,    DMI_CHASSIS_VENDOR);
 192         ADD_DMI_ATTR(chassis_type,      DMI_CHASSIS_TYPE);
 193         ADD_DMI_ATTR(chassis_version,   DMI_CHASSIS_VERSION);
 194         ADD_DMI_ATTR(chassis_serial,    DMI_CHASSIS_SERIAL);
 195         ADD_DMI_ATTR(chassis_asset_tag, DMI_CHASSIS_ASSET_TAG);
 196         sys_dmi_attributes[i++] = &sys_dmi_modalias_attr.attr;
 197
 198         ret = class_register(&dmi_class);
 199         if (ret)
 200                 return ret;
 201
 202         dmi_dev = kzalloc(sizeof(*dmi_dev), GFP_KERNEL);
 203         if (!dmi_dev) {
 204                 ret = -ENOMEM;
 205                 goto fail_class_unregister;
 206         }
 207
 208         dmi_dev->class = &dmi_class;
 209         strcpy(dmi_dev->bus_id, "id");
 210         dmi_dev->groups = sys_dmi_attribute_groups;
 211
 212         ret = device_register(dmi_dev);
 213         if (ret)
 214                 goto fail_class_unregister;
 215
 216         return 0;
 217
 218 fail_class_unregister:
 219
 220         class_unregister(&dmi_class);
 221
 222         return ret;
 223 }
 224
 225 arch_initcall(dmi_id_init);