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dmi-id.c

/*
 * Export SMBIOS/DMI info via sysfs to userspace
 *
 * Copyright 2007, Lennart Poettering
 *
 * Licensed under GPLv2
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/dmi.h>
#include <linux/device.h>
#include <linux/autoconf.h>

struct dmi_device_attribute{
      struct device_attribute dev_attr;
      int field;
};
#define to_dmi_dev_attr(_dev_attr) \
      container_of(_dev_attr, struct dmi_device_attribute, dev_attr)

static ssize_t sys_dmi_field_show(struct device *dev,
                          struct device_attribute *attr,
                          char *page)
{
      int field = to_dmi_dev_attr(attr)->field;
      ssize_t len;
      len = scnprintf(page, PAGE_SIZE, "%s\n", dmi_get_system_info(field));
      page[len-1] = '\n';
      return len;
}

#define DMI_ATTR(_name, _mode, _show, _field)               \
      { .dev_attr = __ATTR(_name, _mode, _show, NULL),      \
        .field = _field }

#define DEFINE_DMI_ATTR_WITH_SHOW(_name, _mode, _field)           \
static struct dmi_device_attribute sys_dmi_##_name##_attr = \
      DMI_ATTR(_name, _mode, sys_dmi_field_show, _field);

DEFINE_DMI_ATTR_WITH_SHOW(bios_vendor,          0444, DMI_BIOS_VENDOR);
DEFINE_DMI_ATTR_WITH_SHOW(bios_version,         0444, DMI_BIOS_VERSION);
DEFINE_DMI_ATTR_WITH_SHOW(bios_date,            0444, DMI_BIOS_DATE);
DEFINE_DMI_ATTR_WITH_SHOW(sys_vendor,           0444, DMI_SYS_VENDOR);
DEFINE_DMI_ATTR_WITH_SHOW(product_name,         0444, DMI_PRODUCT_NAME);
DEFINE_DMI_ATTR_WITH_SHOW(product_version,      0444, DMI_PRODUCT_VERSION);
DEFINE_DMI_ATTR_WITH_SHOW(product_serial, 0400, DMI_PRODUCT_SERIAL);
DEFINE_DMI_ATTR_WITH_SHOW(product_uuid,         0400, DMI_PRODUCT_UUID);
DEFINE_DMI_ATTR_WITH_SHOW(board_vendor,         0444, DMI_BOARD_VENDOR);
DEFINE_DMI_ATTR_WITH_SHOW(board_name,           0444, DMI_BOARD_NAME);
DEFINE_DMI_ATTR_WITH_SHOW(board_version,  0444, DMI_BOARD_VERSION);
DEFINE_DMI_ATTR_WITH_SHOW(board_serial,         0400, DMI_BOARD_SERIAL);
DEFINE_DMI_ATTR_WITH_SHOW(board_asset_tag,      0444, DMI_BOARD_ASSET_TAG);
DEFINE_DMI_ATTR_WITH_SHOW(chassis_vendor, 0444, DMI_CHASSIS_VENDOR);
DEFINE_DMI_ATTR_WITH_SHOW(chassis_type,         0444, DMI_CHASSIS_TYPE);
DEFINE_DMI_ATTR_WITH_SHOW(chassis_version,      0444, DMI_CHASSIS_VERSION);
DEFINE_DMI_ATTR_WITH_SHOW(chassis_serial, 0400, DMI_CHASSIS_SERIAL);
DEFINE_DMI_ATTR_WITH_SHOW(chassis_asset_tag,    0444, DMI_CHASSIS_ASSET_TAG);

static void ascii_filter(char *d, const char *s)
{
      /* Filter out characters we don't want to see in the modalias string */
      for (; *s; s++)
            if (*s > ' ' && *s < 127 && *s != ':')
                  *(d++) = *s;

      *d = 0;
}

static ssize_t get_modalias(char *buffer, size_t buffer_size)
{
      static const struct mafield {
            const char *prefix;
            int field;
      } fields[] = {
            { "bvn", DMI_BIOS_VENDOR },
            { "bvr", DMI_BIOS_VERSION },
            { "bd",  DMI_BIOS_DATE },
            { "svn", DMI_SYS_VENDOR },
            { "pn",  DMI_PRODUCT_NAME },
            { "pvr", DMI_PRODUCT_VERSION },
            { "rvn", DMI_BOARD_VENDOR },
            { "rn",  DMI_BOARD_NAME },
            { "rvr", DMI_BOARD_VERSION },
            { "cvn", DMI_CHASSIS_VENDOR },
            { "ct",  DMI_CHASSIS_TYPE },
            { "cvr", DMI_CHASSIS_VERSION },
            { NULL,  DMI_NONE }
      };

      ssize_t l, left;
      char *p;
      const struct mafield *f;

      strcpy(buffer, "dmi");
      p = buffer + 3; left = buffer_size - 4;

      for (f = fields; f->prefix && left > 0; f++) {
            const char *c;
            char *t;

            c = dmi_get_system_info(f->field);
            if (!c)
                  continue;

            t = kmalloc(strlen(c) + 1, GFP_KERNEL);
            if (!t)
                  break;
            ascii_filter(t, c);
            l = scnprintf(p, left, ":%s%s", f->prefix, t);
            kfree(t);

            p += l;
            left -= l;
      }

      p[0] = ':';
      p[1] = 0;

      return p - buffer + 1;
}

static ssize_t sys_dmi_modalias_show(struct device *dev,
                             struct device_attribute *attr, char *page)
{
      ssize_t r;
      r = get_modalias(page, PAGE_SIZE-1);
      page[r] = '\n';
      page[r+1] = 0;
      return r+1;
}

static struct device_attribute sys_dmi_modalias_attr =
      __ATTR(modalias, 0444, sys_dmi_modalias_show, NULL);

static struct attribute *sys_dmi_attributes[DMI_STRING_MAX+2];

static struct attribute_group sys_dmi_attribute_group = {
      .attrs = sys_dmi_attributes,
};

static struct attribute_group* sys_dmi_attribute_groups[] = {
      &sys_dmi_attribute_group,
      NULL
};

static int dmi_dev_uevent(struct device *dev, struct kobj_uevent_env *env)
{
      ssize_t len;

      if (add_uevent_var(env, "MODALIAS="))
            return -ENOMEM;
      len = get_modalias(&env->buf[env->buflen - 1],
                     sizeof(env->buf) - env->buflen);
      if (len >= (sizeof(env->buf) - env->buflen))
            return -ENOMEM;
      env->buflen += len;
      return 0;
}

static struct class dmi_class = {
      .name = "dmi",
      .dev_release = (void(*)(struct device *)) kfree,
      .dev_uevent = dmi_dev_uevent,
};

static struct device *dmi_dev;

/* Initialization */

#define ADD_DMI_ATTR(_name, _field) \
      if (dmi_get_system_info(_field)) \
            sys_dmi_attributes[i++] = &sys_dmi_##_name##_attr.dev_attr.attr;

/* In a separate function to keep gcc 3.2 happy - do NOT merge this in
   dmi_id_init! */
static void __init dmi_id_init_attr_table(void)
{
      int i;

      /* Not necessarily all DMI fields are available on all
       * systems, hence let's built an attribute table of just
       * what's available */
      i = 0;
      ADD_DMI_ATTR(bios_vendor,       DMI_BIOS_VENDOR);
      ADD_DMI_ATTR(bios_version,      DMI_BIOS_VERSION);
      ADD_DMI_ATTR(bios_date,         DMI_BIOS_DATE);
      ADD_DMI_ATTR(sys_vendor,        DMI_SYS_VENDOR);
      ADD_DMI_ATTR(product_name,      DMI_PRODUCT_NAME);
      ADD_DMI_ATTR(product_version,   DMI_PRODUCT_VERSION);
      ADD_DMI_ATTR(product_serial,    DMI_PRODUCT_SERIAL);
      ADD_DMI_ATTR(product_uuid,      DMI_PRODUCT_UUID);
      ADD_DMI_ATTR(board_vendor,      DMI_BOARD_VENDOR);
      ADD_DMI_ATTR(board_name,        DMI_BOARD_NAME);
      ADD_DMI_ATTR(board_version,     DMI_BOARD_VERSION);
      ADD_DMI_ATTR(board_serial,      DMI_BOARD_SERIAL);
      ADD_DMI_ATTR(board_asset_tag,   DMI_BOARD_ASSET_TAG);
      ADD_DMI_ATTR(chassis_vendor,    DMI_CHASSIS_VENDOR);
      ADD_DMI_ATTR(chassis_type,      DMI_CHASSIS_TYPE);
      ADD_DMI_ATTR(chassis_version,   DMI_CHASSIS_VERSION);
      ADD_DMI_ATTR(chassis_serial,    DMI_CHASSIS_SERIAL);
      ADD_DMI_ATTR(chassis_asset_tag, DMI_CHASSIS_ASSET_TAG);
      sys_dmi_attributes[i++] = &sys_dmi_modalias_attr.attr;
}

static int __init dmi_id_init(void)
{
      int ret;

      if (!dmi_available)
            return -ENODEV;

      dmi_id_init_attr_table();

      ret = class_register(&dmi_class);
      if (ret)
            return ret;

      dmi_dev = kzalloc(sizeof(*dmi_dev), GFP_KERNEL);
      if (!dmi_dev) {
            ret = -ENOMEM;
            goto fail_class_unregister;
      }

      dmi_dev->class = &dmi_class;
      strcpy(dmi_dev->bus_id, "id");
      dmi_dev->groups = sys_dmi_attribute_groups;

      ret = device_register(dmi_dev);
      if (ret)
            goto fail_class_unregister;

      return 0;

fail_class_unregister:

      class_unregister(&dmi_class);

      return ret;
}

arch_initcall(dmi_id_init);

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