linux/drivers/firmware/dmi-id.c
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   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
  16struct 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
  23static 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)         \
  39static struct dmi_device_attribute sys_dmi_##_name##_attr =     \
  40        DMI_ATTR(_name, _mode, sys_dmi_field_show, _field);
  41
  42DEFINE_DMI_ATTR_WITH_SHOW(bios_vendor,          0444, DMI_BIOS_VENDOR);
  43DEFINE_DMI_ATTR_WITH_SHOW(bios_version,         0444, DMI_BIOS_VERSION);
  44DEFINE_DMI_ATTR_WITH_SHOW(bios_date,            0444, DMI_BIOS_DATE);
  45DEFINE_DMI_ATTR_WITH_SHOW(sys_vendor,           0444, DMI_SYS_VENDOR);
  46DEFINE_DMI_ATTR_WITH_SHOW(product_name,         0444, DMI_PRODUCT_NAME);
  47DEFINE_DMI_ATTR_WITH_SHOW(product_version,      0444, DMI_PRODUCT_VERSION);
  48DEFINE_DMI_ATTR_WITH_SHOW(product_serial,       0400, DMI_PRODUCT_SERIAL);
  49DEFINE_DMI_ATTR_WITH_SHOW(product_uuid,         0400, DMI_PRODUCT_UUID);
  50DEFINE_DMI_ATTR_WITH_SHOW(board_vendor,         0444, DMI_BOARD_VENDOR);
  51DEFINE_DMI_ATTR_WITH_SHOW(board_name,           0444, DMI_BOARD_NAME);
  52DEFINE_DMI_ATTR_WITH_SHOW(board_version,        0444, DMI_BOARD_VERSION);
  53DEFINE_DMI_ATTR_WITH_SHOW(board_serial,         0400, DMI_BOARD_SERIAL);
  54DEFINE_DMI_ATTR_WITH_SHOW(board_asset_tag,      0444, DMI_BOARD_ASSET_TAG);
  55DEFINE_DMI_ATTR_WITH_SHOW(chassis_vendor,       0444, DMI_CHASSIS_VENDOR);
  56DEFINE_DMI_ATTR_WITH_SHOW(chassis_type,         0444, DMI_CHASSIS_TYPE);
  57DEFINE_DMI_ATTR_WITH_SHOW(chassis_version,      0444, DMI_CHASSIS_VERSION);
  58DEFINE_DMI_ATTR_WITH_SHOW(chassis_serial,       0400, DMI_CHASSIS_SERIAL);
  59DEFINE_DMI_ATTR_WITH_SHOW(chassis_asset_tag,    0444, DMI_CHASSIS_ASSET_TAG);
  60
  61static 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
  71static 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
 124static 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
 134static struct device_attribute sys_dmi_modalias_attr =
 135        __ATTR(modalias, 0444, sys_dmi_modalias_show, NULL);
 136
 137static struct attribute *sys_dmi_attributes[DMI_STRING_MAX+2];
 138
 139static struct attribute_group sys_dmi_attribute_group = {
 140        .attrs = sys_dmi_attributes,
 141};
 142
 143static const struct attribute_group* sys_dmi_attribute_groups[] = {
 144        &sys_dmi_attribute_group,
 145        NULL
 146};
 147
 148static 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
 162static struct class dmi_class = {
 163        .name = "dmi",
 164        .dev_release = (void(*)(struct device *)) kfree,
 165        .dev_uevent = dmi_dev_uevent,
 166};
 167
 168static 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! */
 178static 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
 207static 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
 236fail_free_dmi_dev:
 237        kfree(dmi_dev);
 238fail_class_unregister:
 239
 240        class_unregister(&dmi_class);
 241
 242        return ret;
 243}
 244
 245arch_initcall(dmi_id_init);
 246
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