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#include <linux/types.h>

#include <linux/string.h>

#include <linux/init.h>

#include <linux/module.h>

#include <linux/dmi.h>

#include <linux/efi.h>

#include <linux/bootmem.h>

#include <linux/slab.h>

#include <asm/dmi.h>

static char * __init dmi_string(const struct dmi_header *dm, u8 s)

{

        const u8 *bp = ((u8 *) dm) + dm->length;

        char *str = "";

        if (s) {

                s--;

                while (s > 0 && *bp) {

                        bp += strlen(bp) + 1;

                        s--;

                }

                if (*bp != 0) {

                        str = dmi_alloc(strlen(bp) + 1);

                        if (str != NULL)

                                strcpy(str, bp);

                        else

                                printk(KERN_ERR "dmi_string: out of memory.\n");

                }

        }

        return str;

}

/*

 *      We have to be cautious here. We have seen BIOSes with DMI pointers

 *      pointing to completely the wrong place for example

 */

static int __init dmi_table(u32 base, int len, int num,

                            void (*decode)(const struct dmi_header *))

{

        u8 *buf, *data;

        int i = 0;

        buf = dmi_ioremap(base, len);

        if (buf == NULL)

                return -1;

        data = buf;

        /*

         *      Stop when we see all the items the table claimed to have

         *      OR we run off the end of the table (also happens)

         */

        while ((i < num) && (data - buf + sizeof(struct dmi_header)) <= len) {

                const struct dmi_header *dm = (const struct dmi_header *)data;

                /*

                 *  We want to know the total length (formated area and strings)

                 *  before decoding to make sure we won't run off the table in

                 *  dmi_decode or dmi_string

                 */

                data += dm->length;

                while ((data - buf < len - 1) && (data[0] || data[1]))

                        data++;

                if (data - buf < len - 1)

                        decode(dm);

                data += 2;

                i++;

        }

        dmi_iounmap(buf, len);

        return 0;

}

static int __init dmi_checksum(const u8 *buf)

{

        u8 sum = 0;

        int a;

        for (a = 0; a < 15; a++)

                sum += buf[a];

        return sum == 0;

}

static char *dmi_ident[DMI_STRING_MAX];

static LIST_HEAD(dmi_devices);

int dmi_available;

/*

 *      Save a DMI string

 */

static void __init dmi_save_ident(const struct dmi_header *dm, int slot, int string)

{

        const char *d = (const char*) dm;

        char *p;

        if (dmi_ident[slot])

                return;

        p = dmi_string(dm, d[string]);

        if (p == NULL)

                return;

        dmi_ident[slot] = p;

}

static void __init dmi_save_uuid(const struct dmi_header *dm, int slot, int index)

{

        const 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(const struct dmi_header *dm, int slot, int index)

{

        const 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(const struct dmi_header *dm)

{

        int i, count = (dm->length - sizeof(struct dmi_header)) / 2;

        struct dmi_device *dev;

        for (i = 0; i < count; i++) {

                const char *d = (char *)(dm + 1) + (i * 2);

                /* Skip disabled device */

                if ((*d & 0x80) == 0)

                        continue;

                dev = dmi_alloc(sizeof(*dev));

                if (!dev) {

                        printk(KERN_ERR "dmi_save_devices: out of memory.\n");

                        break;

                }

                dev->type = *d++ & 0x7f;

                dev->name = dmi_string(dm, *d);

                dev->device_data = NULL;

                list_add(&dev->list, &dmi_devices);

        }

}

static void __init dmi_save_oem_strings_devices(const struct dmi_header *dm)

{

        int i, count = *(u8 *)(dm + 1);

        struct dmi_device *dev;

        for (i = 1; i <= count; i++) {

                dev = dmi_alloc(sizeof(*dev));

                if (!dev) {

                        printk(KERN_ERR

                           "dmi_save_oem_strings_devices: out of memory.\n");

                        break;

                }

                dev->type = DMI_DEV_TYPE_OEM_STRING;

                dev->name = dmi_string(dm, i);

                dev->device_data = NULL;

                list_add(&dev->list, &dmi_devices);

        }

}

static void __init dmi_save_ipmi_device(const struct dmi_header *dm)

{

        struct dmi_device *dev;

        void * data;

        data = dmi_alloc(dm->length);

        if (data == NULL) {

                printk(KERN_ERR "dmi_save_ipmi_device: out of memory.\n");

                return;

        }

        memcpy(data, dm, dm->length);

        dev = dmi_alloc(sizeof(*dev));

        if (!dev) {

                printk(KERN_ERR "dmi_save_ipmi_device: out of memory.\n");

                return;

        }

        dev->type = DMI_DEV_TYPE_IPMI;

        dev->name = "IPMI controller";

        dev->device_data = data;

        list_add(&dev->list, &dmi_devices);

}

/*

 *      Process a DMI table entry. Right now all we care about are the BIOS

 *      and machine entries. For 2.5 we should pull the smbus controller info

 *      out of here.

 */

static void __init dmi_decode(const struct dmi_header *dm)

{

        switch(dm->type) {

        case 0:          /* BIOS Information */

                dmi_save_ident(dm, DMI_BIOS_VENDOR, 4);

                dmi_save_ident(dm, DMI_BIOS_VERSION, 5);

                dmi_save_ident(dm, DMI_BIOS_DATE, 8);

                break;

        case 1:         /* System Information */

                dmi_save_ident(dm, DMI_SYS_VENDOR, 4);

                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);

                break;

        case 11:        /* OEM Strings */

                dmi_save_oem_strings_devices(dm);

                break;

        case 38:        /* IPMI Device Information */

                dmi_save_ipmi_device(dm);

        }

}

static int __init dmi_present(const char __iomem *p)

{

        u8 buf[15];

        memcpy_fromio(buf, p, 15);

        if ((memcmp(buf, "_DMI_", 5) == 0) && dmi_checksum(buf)) {

                u16 num = (buf[13] << 8) | buf[12];

                u16 len = (buf[7] << 8) | buf[6];

                u32 base = (buf[11] << 24) | (buf[10] << 16) |

                        (buf[9] << 8) | buf[8];

                /*

                 * DMI version 0.0 means that the real version is taken from

                 * the SMBIOS version, which we don't know at this point.

                 */

                if (buf[14] != 0)

                        printk(KERN_INFO "DMI %d.%d present.\n",

                               buf[14] >> 4, buf[14] & 0xF);

                else

                        printk(KERN_INFO "DMI present.\n");

                if (dmi_table(base,len, num, dmi_decode) == 0)

                        return 0;

        }

        return 1;

}

void __init dmi_scan_machine(void)

{

        char __iomem *p, *q;

        int rc;

        if (efi_enabled) {

                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.

                 */

                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) {

                        dmi_available = 1;

                        return;

                }

        }

        else {

                /*

                 * no iounmap() for that ioremap(); it would be a no-op, but

                 * it's so early in setup that sucker gets confused into doing

                 * what it shouldn't if we actually call it.

                 */

                p = dmi_ioremap(0xF0000, 0x10000);

                if (p == NULL)

                        goto out;

                for (q = p; q < p + 0x10000; q += 16) {

                        rc = dmi_present(q);

                        if (!rc) {

                                dmi_available = 1;

                                return;

                        }

                }

        }

 out:   printk(KERN_INFO "DMI not present or invalid.\n");

}

/**

 *      dmi_check_system - check system DMI data

 *      @list: array of dmi_system_id structures to match against

 *              All non-null elements of the list must match

 *              their slot's (field index's) data (i.e., each

 *              list string must be a substring of the specified

 *              DMI slot's string data) to be considered a

 *              successful match.

 *

 *      Walk the blacklist table running matching functions until someone

 *      returns non zero or we hit the end. Callback function is called for

 *      each successful match. Returns the number of matches.

 */

int dmi_check_system(const struct dmi_system_id *list)

{

        int i, count = 0;

        const struct dmi_system_id *d = list;

        while (d->ident) {

                for (i = 0; i < ARRAY_SIZE(d->matches); i++) {

                        int s = d->matches[i].slot;

                        if (s == DMI_NONE)

                                continue;

                        if (dmi_ident[s] && strstr(dmi_ident[s], d->matches[i].substr))

                                continue;

                        /* No match */

                        goto fail;

                }

                count++;

                if (d->callback && d->callback(d))

                        break;

fail:           d++;

        }

        return count;

}

EXPORT_SYMBOL(dmi_check_system);

/**

 *      dmi_get_system_info - return DMI data value

 *      @field: data index (see enum dmi_field)

 *

 *      Returns one DMI data value, can be used to perform

 *      complex DMI data checks.

 */

const char *dmi_get_system_info(int field)

{

        return dmi_ident[field];

}

EXPORT_SYMBOL(dmi_get_system_info);

/**

 *      dmi_name_in_vendors - Check if string is anywhere in the DMI vendor information.

 *      @str:   Case sensitive Name

 */

int dmi_name_in_vendors(const char *str)

{

        static int fields[] = { DMI_BIOS_VENDOR, DMI_BIOS_VERSION, DMI_SYS_VENDOR,

                                DMI_PRODUCT_NAME, DMI_PRODUCT_VERSION, DMI_BOARD_VENDOR,

                                DMI_BOARD_NAME, DMI_BOARD_VERSION, DMI_NONE };

        int i;

        for (i = 0; fields[i] != DMI_NONE; i++) {

                int f = fields[i];

                if (dmi_ident[f] && strstr(dmi_ident[f], str))

                        return 1;

        }

        return 0;

}

EXPORT_SYMBOL(dmi_name_in_vendors);

/**

 *      dmi_find_device - find onboard device by type/name

 *      @type: device type or %DMI_DEV_TYPE_ANY to match all device types

 *      @name: device name string or %NULL to match all

 *      @from: previous device found in search, or %NULL for new search.

 *

 *      Iterates through the list of known onboard devices. If a device is

 *      found with a matching @vendor and @device, a pointer to its device

 *      structure is returned.  Otherwise, %NULL is returned.

 *      A new search is initiated by passing %NULL as the @from argument.

 *      If @from is not %NULL, searches continue from next device.

 */

const struct dmi_device * dmi_find_device(int type, const char *name,

                                    const struct dmi_device *from)

{

        const struct list_head *head = from ? &from->list : &dmi_devices;

        struct list_head *d;

        for(d = head->next; d != &dmi_devices; d = d->next) {

                const struct dmi_device *dev =

                        list_entry(d, struct dmi_device, list);

                if (((type == DMI_DEV_TYPE_ANY) || (dev->type == type)) &&

                    ((name == NULL) || (strcmp(dev->name, name) == 0)))

                        return dev;

        }

        return NULL;

}

EXPORT_SYMBOL(dmi_find_device);

/**

 *      dmi_get_year - Return year of a DMI date

 *      @field: data index (like dmi_get_system_info)

 *

 *      Returns -1 when the field doesn't exist. 0 when it is broken.

 */

int dmi_get_year(int field)

{

        int year;

        const char *s = dmi_get_system_info(field);

        if (!s)

                return -1;

        if (*s == '\0')

                return 0;

        s = strrchr(s, '/');

        if (!s)

                return 0;

        s += 1;

        year = simple_strtoul(s, NULL, 0);

        if (year && year < 100) {       /* 2-digit year */

                year += 1900;

                if (year < 1996)        /* no dates < spec 1.0 */

                        year += 100;

        }

        return year;

}

/**

 *      dmi_get_slot - return dmi_ident[slot]

 *      @slot:  index into dmi_ident[]

 */

char *dmi_get_slot(int slot)

{

        return(dmi_ident[slot]);

}