4 files changed, 299 insertions, 6 deletions

diff --git a/drivers/firmware/Kconfig b/drivers/firmware/Kconfig
index 88f462122a30..05f02a326f1c 100644
--- a/drivers/firmware/Kconfig
+++ b/drivers/firmware/Kconfig
@@ -84,4 +84,13 @@ config DCDBAS
           Say Y or M here to enable the driver for use by Dell systems
           management software such as Dell OpenManage.
 
+config DMIID
+    bool "Export DMI identification via sysfs to userspace"
+    depends on DMI
+    default y
+        help
+          Say Y here if you want to query SMBIOS/DMI system identification
+          information from userspace through /sys/class/dmi/id/ or if you want
+          DMI-based module auto-loading.
+
 endmenu
diff --git a/drivers/firmware/Makefile b/drivers/firmware/Makefile
index 98e395f4bb29..8d4ebc805a50 100644
--- a/drivers/firmware/Makefile
+++ b/drivers/firmware/Makefile
@@ -7,3 +7,4 @@ obj-$(CONFIG_EFI_VARS)		+= efivars.o
 obj-$(CONFIG_EFI_PCDP)          += pcdp.o
 obj-$(CONFIG_DELL_RBU)          += dell_rbu.o
 obj-$(CONFIG_DCDBAS)            += dcdbas.o
+obj-$(CONFIG_DMIID)             += dmi-id.o
diff --git a/drivers/firmware/dmi-id.c b/drivers/firmware/dmi-id.c
new file mode 100644
index 000000000000..59c3b5aa89f4
--- /dev/null
+++ b/drivers/firmware/dmi-id.c
@@ -0,0 +1,222 @@
+/*
+ * 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>
+
+#define DEFINE_DMI_ATTR(_name, _mode, _show)            \
+static struct device_attribute sys_dmi_##_name##_attr = \
+        __ATTR(_name, _mode, _show, NULL);
+
+#define DEFINE_DMI_ATTR_WITH_SHOW(_name, _mode, _field)                 \
+static ssize_t sys_dmi_##_name##_show(struct device *dev,               \
+                                      struct device_attribute *attr,    \
+                                      char *page)                       \
+{                                                                       \
+        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, sys_dmi_##_name##_show);
+
+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;
+}
+
+DEFINE_DMI_ATTR(modalias, 0444, sys_dmi_modalias_show);
+
+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, char **envp,
+                            int num_envp, char *buffer, int buffer_size)
+{
+        strcpy(buffer, "MODALIAS=");
+        get_modalias(buffer+9, buffer_size-9);
+        envp[0] = buffer;
+        envp[1] = NULL;
+
+        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.attr;
+
+extern int dmi_available;
+
+static int __init dmi_id_init(void)
+{
+        int ret, i;
+
+        if (!dmi_available)
+                return -ENODEV;
+
+        /* 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;
+
+        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);
diff --git a/drivers/firmware/dmi_scan.c b/drivers/firmware/dmi_scan.c
index 37deee6c0c1c..f7318b3b51f2 100644
--- a/drivers/firmware/dmi_scan.c
+++ b/drivers/firmware/dmi_scan.c
@@ -84,6 +84,7 @@ static int __init dmi_checksum(u8 *buf)
 
 static char *dmi_ident[DMI_STRING_MAX];
 static LIST_HEAD(dmi_devices);
+int dmi_available;
 
 /*
  *      Save a DMI string
@@ -102,6 +103,51 @@ static void __init dmi_save_ident(struct dmi_header *dm, int slot, int string)
         dmi_ident[slot] = p;
 }
 
+static void __init dmi_save_uuid(struct dmi_header *dm, int slot, int index)
+{
+        u8 *d = (u8*) dm + index;
+        char *s;
+        int is_ff = 1, is_00 = 1, i;
+
+        if (dmi_ident[slot])
+                return;
+
+        for (i = 0; i < 16 && (is_ff || is_00); i++) {
+                if(d[i] != 0x00) is_ff = 0;
+                if(d[i] != 0xFF) is_00 = 0;
+        }
+
+        if (is_ff || is_00)
+                return;
+
+        s = dmi_alloc(16*2+4+1);
+        if (!s)
+                return;
+
+        sprintf(s,
+                "%02X%02X%02X%02X-%02X%02X-%02X%02X-%02X%02X-%02X%02X%02X%02X%02X%02X",
+                d[0], d[1], d[2], d[3], d[4], d[5], d[6], d[7],
+                d[8], d[9], d[10], d[11], d[12], d[13], d[14], d[15]);
+
+        dmi_ident[slot] = s;
+}
+
+static void __init dmi_save_type(struct dmi_header *dm, int slot, int index)
+{
+        u8 *d = (u8*) dm + index;
+        char *s;
+
+        if (dmi_ident[slot])
+                return;
+
+        s = dmi_alloc(4);
+        if (!s)
+                return;
+
+        sprintf(s, "%u", *d & 0x7F);
+        dmi_ident[slot] = s;
+}
+
 static void __init dmi_save_devices(struct dmi_header *dm)
 {
         int i, count = (dm->length - sizeof(struct dmi_header)) / 2;
@@ -192,11 +238,21 @@ static void __init dmi_decode(struct dmi_header *dm)
                 dmi_save_ident(dm, DMI_PRODUCT_NAME, 5);
                 dmi_save_ident(dm, DMI_PRODUCT_VERSION, 6);
                 dmi_save_ident(dm, DMI_PRODUCT_SERIAL, 7);
+                dmi_save_uuid(dm, DMI_PRODUCT_UUID, 8);
                 break;
         case 2:         /* Base Board Information */
                 dmi_save_ident(dm, DMI_BOARD_VENDOR, 4);
                 dmi_save_ident(dm, DMI_BOARD_NAME, 5);
                 dmi_save_ident(dm, DMI_BOARD_VERSION, 6);
+                dmi_save_ident(dm, DMI_BOARD_SERIAL, 7);
+                dmi_save_ident(dm, DMI_BOARD_ASSET_TAG, 8);
+                break;
+        case 3:         /* Chassis Information */
+                dmi_save_ident(dm, DMI_CHASSIS_VENDOR, 4);
+                dmi_save_type(dm, DMI_CHASSIS_TYPE, 5);
+                dmi_save_ident(dm, DMI_CHASSIS_VERSION, 6);
+                dmi_save_ident(dm, DMI_CHASSIS_SERIAL, 7);
+                dmi_save_ident(dm, DMI_CHASSIS_ASSET_TAG, 8);
                 break;
         case 10:        /* Onboard Devices Information */
                 dmi_save_devices(dm);
@@ -243,18 +299,20 @@ void __init dmi_scan_machine(void)
                 if (efi.smbios == EFI_INVALID_TABLE_ADDR)
                         goto out;
 
-               /* This is called as a core_initcall() because it isn't
-                * needed during early boot.  This also means we can
-                * iounmap the space when we're done with it.
-                */
+                /* This is called as a core_initcall() because it isn't
+                 * needed during early boot.  This also means we can
+                 * iounmap the space when we're done with it.
+                 */
                 p = dmi_ioremap(efi.smbios, 32);
                 if (p == NULL)
                         goto out;
 
                 rc = dmi_present(p + 0x10); /* offset of _DMI_ string */
                 dmi_iounmap(p, 32);
-                if (!rc)
+                if (!rc) {
+                        dmi_available = 1;
                         return;
+                }
         }
         else {
                 /*
@@ -268,8 +326,10 @@ void __init dmi_scan_machine(void)
 
                 for (q = p; q < p + 0x10000; q += 16) {
                         rc = dmi_present(q);
-                        if (!rc)
+                        if (!rc) {
+                                dmi_available = 1;
                                 return;
+                        }
                 }
         }
  out:   printk(KERN_INFO "DMI not present or invalid.\n");
@@ -404,3 +464,4 @@ int dmi_get_year(int field)
 
         return year;
 }
+