/*
 *  blacklist.c
 *
 *  Check to see if the given machine has a known bad ACPI BIOS
 *  or if the BIOS is too old.
 *  Check given machine against acpi_osi_dmi_table[].
 *
 *  Copyright (C) 2004 Len Brown <len.brown@intel.com>
 *  Copyright (C) 2002 Andy Grover <andrew.grover@intel.com>
 *
 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or (at
 *  your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful, but
 *  WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 *  General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License along
 *  with this program; if not, write to the Free Software Foundation, Inc.,
 *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
 *
 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/acpi.h>
#include <acpi/acpi_bus.h>
#include <linux/dmi.h>

enum acpi_blacklist_predicates {
        all_versions,
        less_than_or_equal,
        equal,
        greater_than_or_equal,
};

struct acpi_blacklist_item {
        char oem_id[7];
        char oem_table_id[9];
        u32 oem_revision;
        char *table;
        enum acpi_blacklist_predicates oem_revision_predicate;
        char *reason;
        u32 is_critical_error;
};

static struct dmi_system_id acpi_osi_dmi_table[] __initdata;

/*
 * POLICY: If *anything* doesn't work, put it on the blacklist.
 *         If they are critical errors, mark it critical, and abort driver load.
 */
static struct acpi_blacklist_item acpi_blacklist[] __initdata = {
        /* Compaq Presario 1700 */
        {"PTLTD ", "  DSDT  ", 0x06040000, ACPI_SIG_DSDT, less_than_or_equal,
         "Multiple problems", 1},
        /* Sony FX120, FX140, FX150? */
        {"SONY  ", "U0      ", 0x20010313, ACPI_SIG_DSDT, less_than_or_equal,
         "ACPI driver problem", 1},
        /* Compaq Presario 800, Insyde BIOS */
        {"INT440", "SYSFexxx", 0x00001001, ACPI_SIG_DSDT, less_than_or_equal,
         "Does not use _REG to protect EC OpRegions", 1},
        /* IBM 600E - _ADR should return 7, but it returns 1 */
        {"IBM   ", "TP600E  ", 0x00000105, ACPI_SIG_DSDT, less_than_or_equal,
         "Incorrect _ADR", 1},

        {""}
};

#if     CONFIG_ACPI_BLACKLIST_YEAR

static int __init blacklist_by_year(void)
{
        int year = dmi_get_year(DMI_BIOS_DATE);
        /* Doesn't exist? Likely an old system */
        if (year == -1) {
                printk(KERN_ERR PREFIX "no DMI BIOS year, "
                        "acpi=force is required to enable ACPI\n" );
                return 1;
        }
        /* 0? Likely a buggy new BIOS */
        if (year == 0) {
                printk(KERN_ERR PREFIX "DMI BIOS year==0, "
                        "assuming ACPI-capable machine\n" );
                return 0;
        }
        if (year < CONFIG_ACPI_BLACKLIST_YEAR) {
                printk(KERN_ERR PREFIX "BIOS age (%d) fails cutoff (%d), "
                       "acpi=force is required to enable ACPI\n",
                       year, CONFIG_ACPI_BLACKLIST_YEAR);
                return 1;
        }
        return 0;
}
#else
static inline int blacklist_by_year(void)
{
        return 0;
}
#endif

int __init acpi_blacklisted(void)
{
        int i = 0;
        int blacklisted = 0;
        struct acpi_table_header table_header;

        while (acpi_blacklist[i].oem_id[0] != '\0') {
                if (acpi_get_table_header(acpi_blacklist[i].table, 0, &table_header)) {
                        i++;
                        continue;
                }

                if (strncmp(acpi_blacklist[i].oem_id, table_header.oem_id, 6)) {
                        i++;
                        continue;
                }

                if (strncmp
                    (acpi_blacklist[i].oem_table_id, table_header.oem_table_id,
                     8)) {
                        i++;
                        continue;
                }

                if ((acpi_blacklist[i].oem_revision_predicate == all_versions)
                    || (acpi_blacklist[i].oem_revision_predicate ==
                        less_than_or_equal
                        && table_header.oem_revision <=
                        acpi_blacklist[i].oem_revision)
                    || (acpi_blacklist[i].oem_revision_predicate ==
                        greater_than_or_equal
                        && table_header.oem_revision >=
                        acpi_blacklist[i].oem_revision)
                    || (acpi_blacklist[i].oem_revision_predicate == equal
                        && table_header.oem_revision ==
                        acpi_blacklist[i].oem_revision)) {

                        printk(KERN_ERR PREFIX
                               "Vendor \"%6.6s\" System \"%8.8s\" "
                               "Revision 0x%x has a known ACPI BIOS problem.\n",
                               acpi_blacklist[i].oem_id,
                               acpi_blacklist[i].oem_table_id,
                               acpi_blacklist[i].oem_revision);

                        printk(KERN_ERR PREFIX
                               "Reason: %s. This is a %s error\n",
                               acpi_blacklist[i].reason,
                               (acpi_blacklist[i].
                                is_critical_error ? "non-recoverable" :
                                "recoverable"));

                        blacklisted = acpi_blacklist[i].is_critical_error;
                        break;
                } else {
                        i++;
                }
        }

        blacklisted += blacklist_by_year();

        dmi_check_system(acpi_osi_dmi_table);

        return blacklisted;
}
#ifdef CONFIG_DMI
static int __init dmi_enable_osi_linux(const struct dmi_system_id *d)
{
        acpi_dmi_osi_linux(1, d);       /* enable */
        return 0;
}
static int __init dmi_disable_osi_vista(const struct dmi_system_id *d)
{
        printk(KERN_NOTICE PREFIX "DMI detected: %s\n", d->ident);
        acpi_osi_setup("!Windows 2006");
        return 0;
}

static struct dmi_system_id acpi_osi_dmi_table[] __initdata = {
        {
        .callback = dmi_disable_osi_vista,
        .ident = "Fujitsu Siemens",
        .matches = {
                     DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU SIEMENS"),
                     DMI_MATCH(DMI_PRODUCT_NAME, "ESPRIMO Mobile V5505"),
                },
        },

        /*
         * BIOS invocation of _OSI(Linux) is almost always a BIOS bug.
         * Linux ignores it, except for the machines enumerated below.
         */

        /*
         * Lenovo has a mix of systems OSI(Linux) situations
         * and thus we can not wildcard the vendor.
         *
         * _OSI(Linux) helps sound
         * DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad R61"),
         * DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad T61"),
         * _OSI(Linux) has Linux specific hooks
         * DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad X61"),
         * _OSI(Linux) is a NOP:
         * DMI_MATCH(DMI_PRODUCT_VERSION, "3000 N100"),
         * DMI_MATCH(DMI_PRODUCT_VERSION, "LENOVO3000 V100"),
         */
        {
        .callback = dmi_enable_osi_linux,
        .ident = "Lenovo ThinkPad R61",
        .matches = {
                     DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
                     DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad R61"),
                },
        },
        {
        .callback = dmi_enable_osi_linux,
        .ident = "Lenovo ThinkPad T61",
        .matches = {
                     DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
                     DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad T61"),
                },
        },
        {
        .callback = dmi_enable_osi_linux,
        .ident = "Lenovo ThinkPad X61",
        .matches = {
                     DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
                     DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad X61"),
                },
        },
        {}
};

#endif /* CONFIG_DMI */