/*
 *  Copyright (C) 2015       Red Hat Inc.
 *                           Hans de Goede <hdegoede@redhat.com>
 *  Copyright (C) 2008       SuSE Linux Products GmbH
 *                           Thomas Renninger <trenn@suse.de>
 *
 *  May be copied or modified under the terms of the GNU General Public License
 *
 * video_detect.c:
 * After PCI devices are glued with ACPI devices
 * acpi_get_pci_dev() can be called to identify ACPI graphics
 * devices for which a real graphics card is plugged in
 *
 * Depending on whether ACPI graphics extensions (cmp. ACPI spec Appendix B)
 * are available, video.ko should be used to handle the device.
 *
 * Otherwise vendor specific drivers like thinkpad_acpi, asus-laptop,
 * sony_acpi,... can take care about backlight brightness.
 *
 * Backlight drivers can use acpi_video_get_backlight_type() to determine which
 * driver should handle the backlight. RAW/GPU-driver backlight drivers must
 * use the acpi_video_backlight_use_native() helper for this.
 *
 * If CONFIG_ACPI_VIDEO is neither set as "compiled in" (y) nor as a module (m)
 * this file will not be compiled and acpi_video_get_backlight_type() will
 * always return acpi_backlight_vendor.
 */

#include <linux/export.h>
#include <linux/acpi.h>
#include <linux/apple-gmux.h>
#include <linux/backlight.h>
#include <linux/dmi.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/platform_data/x86/nvidia-wmi-ec-backlight.h>
#include <linux/pnp.h>
#include <linux/types.h>
#include <linux/workqueue.h>
#include <acpi/video.h>

static enum acpi_backlight_type acpi_backlight_cmdline = acpi_backlight_undef;
static enum acpi_backlight_type acpi_backlight_dmi = acpi_backlight_undef;

static void acpi_video_parse_cmdline(void)
{
        if (!strcmp("vendor", acpi_video_backlight_string))
                acpi_backlight_cmdline = acpi_backlight_vendor;
        if (!strcmp("video", acpi_video_backlight_string))
                acpi_backlight_cmdline = acpi_backlight_video;
        if (!strcmp("native", acpi_video_backlight_string))
                acpi_backlight_cmdline = acpi_backlight_native;
        if (!strcmp("nvidia_wmi_ec", acpi_video_backlight_string))
                acpi_backlight_cmdline = acpi_backlight_nvidia_wmi_ec;
        if (!strcmp("apple_gmux", acpi_video_backlight_string))
                acpi_backlight_cmdline = acpi_backlight_apple_gmux;
        if (!strcmp("dell_uart", acpi_video_backlight_string))
                acpi_backlight_cmdline = acpi_backlight_dell_uart;
        if (!strcmp("none", acpi_video_backlight_string))
                acpi_backlight_cmdline = acpi_backlight_none;
}

static acpi_status
find_video(acpi_handle handle, u32 lvl, void *context, void **rv)
{
        struct acpi_device *acpi_dev = acpi_fetch_acpi_dev(handle);
        long *cap = context;
        struct pci_dev *dev;

        static const struct acpi_device_id video_ids[] = {
                {ACPI_VIDEO_HID, 0},
                {"", 0},
        };

        if (acpi_dev && !acpi_match_device_ids(acpi_dev, video_ids)) {
                dev = acpi_get_pci_dev(handle);
                if (!dev)
                        return AE_OK;
                pci_dev_put(dev);
                *cap |= acpi_is_video_device(handle);
        }
        return AE_OK;
}

/* This depends on ACPI_WMI which is X86 only */
#ifdef CONFIG_X86
static bool nvidia_wmi_ec_supported(void)
{
        struct wmi_brightness_args args = {
                .mode = WMI_BRIGHTNESS_MODE_GET,
                .val = 0,
                .ret = 0,
        };
        struct acpi_buffer buf = { (acpi_size)sizeof(args), &args };
        acpi_status status;

        status = wmi_evaluate_method(WMI_BRIGHTNESS_GUID, 0,
                                     WMI_BRIGHTNESS_METHOD_SOURCE, &buf, &buf);
        if (ACPI_FAILURE(status))
                return false;

        /*
         * If brightness is handled by the EC then nvidia-wmi-ec-backlight
         * should be used, else the GPU driver(s) should be used.
         */
        return args.ret == WMI_BRIGHTNESS_SOURCE_EC;
}
#else
static bool nvidia_wmi_ec_supported(void)
{
        return false;
}
#endif

/* Force to use vendor driver when the ACPI device is known to be
 * buggy */
static int video_detect_force_vendor(const struct dmi_system_id *d)
{
        acpi_backlight_dmi = acpi_backlight_vendor;
        return 0;
}

static int video_detect_force_video(const struct dmi_system_id *d)
{
        acpi_backlight_dmi = acpi_backlight_video;
        return 0;
}

static int video_detect_force_native(const struct dmi_system_id *d)
{
        acpi_backlight_dmi = acpi_backlight_native;
        return 0;
}

static int video_detect_portege_r100(const struct dmi_system_id *d)
{
        struct pci_dev *dev;
        /* Search for Trident CyberBlade XP4m32 to confirm Portégé R100 */
        dev = pci_get_device(PCI_VENDOR_ID_TRIDENT, 0x2100, NULL);
        if (dev)
                acpi_backlight_dmi = acpi_backlight_vendor;
        return 0;
}

static const struct dmi_system_id video_detect_dmi_table[] = {
        /*
         * Models which should use the vendor backlight interface,
         * because of broken ACPI video backlight control.
         */
        {
         /* https://bugzilla.redhat.com/show_bug.cgi?id=1128309 */
         .callback = video_detect_force_vendor,
         /* Acer KAV80 */
         .matches = {
                DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
                DMI_MATCH(DMI_PRODUCT_NAME, "KAV80"),
                },
        },
        {
         .callback = video_detect_force_vendor,
         /* Asus UL30VT */
         .matches = {
                DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
                DMI_MATCH(DMI_PRODUCT_NAME, "UL30VT"),
                },
        },
        {
         .callback = video_detect_force_vendor,
         /* Asus UL30A */
         .matches = {
                DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
                DMI_MATCH(DMI_PRODUCT_NAME, "UL30A"),
                },
        },
        {
         .callback = video_detect_force_vendor,
         /* Asus X55U */
         .matches = {
                DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
                DMI_MATCH(DMI_PRODUCT_NAME, "X55U"),
                },
        },
        {
         /* https://bugs.launchpad.net/bugs/1000146 */
         .callback = video_detect_force_vendor,
         /* Asus X101CH */
         .matches = {
                DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
                DMI_MATCH(DMI_PRODUCT_NAME, "X101CH"),
                },
        },
        {
         .callback = video_detect_force_vendor,
         /* Asus X401U */
         .matches = {
                DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
                DMI_MATCH(DMI_PRODUCT_NAME, "X401U"),
                },
        },
        {
         .callback = video_detect_force_vendor,
         /* Asus X501U */
         .matches = {
                DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
                DMI_MATCH(DMI_PRODUCT_NAME, "X501U"),
                },
        },
        {
         /* https://bugs.launchpad.net/bugs/1000146 */
         .callback = video_detect_force_vendor,
         /* Asus 1015CX */
         .matches = {
                DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
                DMI_MATCH(DMI_PRODUCT_NAME, "1015CX"),
                },
        },
        {
         .callback = video_detect_force_vendor,
         /* Samsung N150/N210/N220 */
         .matches = {
                DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
                DMI_MATCH(DMI_PRODUCT_NAME, "N150/N210/N220"),
                DMI_MATCH(DMI_BOARD_NAME, "N150/N210/N220"),
                },
        },
        {
         .callback = video_detect_force_vendor,
         /* Samsung NF110/NF210/NF310 */
         .matches = {
                DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
                DMI_MATCH(DMI_PRODUCT_NAME, "NF110/NF210/NF310"),
                DMI_MATCH(DMI_BOARD_NAME, "NF110/NF210/NF310"),
                },
        },
        {
         .callback = video_detect_force_vendor,
         /* Samsung NC210 */
         .matches = {
                DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
                DMI_MATCH(DMI_PRODUCT_NAME, "NC210/NC110"),
                DMI_MATCH(DMI_BOARD_NAME, "NC210/NC110"),
                },
        },

        /*
         * Models which should use the vendor backlight interface,
         * because of broken native backlight control.
         */
        {
         .callback = video_detect_force_vendor,
         /* Sony Vaio PCG-FRV35 */
         .matches = {
                DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
                DMI_MATCH(DMI_PRODUCT_NAME, "PCG-FRV35"),
                },
        },
        {
         .callback = video_detect_force_vendor,
         /* Panasonic Toughbook CF-18 */
         .matches = {
                DMI_MATCH(DMI_SYS_VENDOR, "Matsushita Electric Industrial"),
                DMI_MATCH(DMI_PRODUCT_NAME, "CF-18"),
                },
        },

        /*
         * Toshiba models with Transflective display, these need to use
         * the toshiba_acpi vendor driver for proper Transflective handling.
         */
        {
         .callback = video_detect_force_vendor,
         .matches = {
                DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
                DMI_MATCH(DMI_PRODUCT_NAME, "PORTEGE R500"),
                },
        },
        {
         .callback = video_detect_force_vendor,
         .matches = {
                DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
                DMI_MATCH(DMI_PRODUCT_NAME, "PORTEGE R600"),
                },
        },

        /*
         * Toshiba Portégé R100 has working both acpi_video and toshiba_acpi
         * vendor driver. But none of them gets activated as it has a VGA with
         * no kernel driver (Trident CyberBlade XP4m32).
         * The DMI strings are generic so check for the VGA chip in callback.
         */
        {
         .callback = video_detect_portege_r100,
         .matches = {
                DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
                DMI_MATCH(DMI_PRODUCT_NAME, "Portable PC"),
                DMI_MATCH(DMI_PRODUCT_VERSION, "Version 1.0"),
                DMI_MATCH(DMI_BOARD_NAME, "Portable PC")
                },
        },

        /*
         * Models which need acpi_video backlight control where the GPU drivers
         * do not call acpi_video_register_backlight() because no internal panel
         * is detected. Typically these are all-in-ones (monitors with builtin
         * PC) where the panel connection shows up as regular DP instead of eDP.
         */
        {
         .callback = video_detect_force_video,
         /* Apple iMac14,1 */
         .matches = {
                DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
                DMI_MATCH(DMI_PRODUCT_NAME, "iMac14,1"),
                },
        },
        {
         .callback = video_detect_force_video,
         /* Apple iMac14,2 */
         .matches = {
                DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
                DMI_MATCH(DMI_PRODUCT_NAME, "iMac14,2"),
                },
        },

        /*
         * These models have a working acpi_video backlight control, and using
         * native backlight causes a regression where backlight does not work
         * when userspace is not handling brightness key events. Disable
         * native_backlight on these to fix this:
         * https://bugzilla.kernel.org/show_bug.cgi?id=81691
         */
        {
         .callback = video_detect_force_video,
         /* ThinkPad T420 */
         .matches = {
                DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
                DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad T420"),
                },
        },
        {
         .callback = video_detect_force_video,
         /* ThinkPad T520 */
         .matches = {
                DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
                DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad T520"),
                },
        },
        {
         .callback = video_detect_force_video,
         /* ThinkPad X201s */
         .matches = {
                DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
                DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad X201s"),
                },
        },
        {
         .callback = video_detect_force_video,
         /* ThinkPad X201T */
         .matches = {
                DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
                DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad X201T"),
                },
        },

        /* The native backlight controls do not work on some older machines */
        {
         /* https://bugs.freedesktop.org/show_bug.cgi?id=81515 */
         .callback = video_detect_force_video,
         /* HP ENVY 15 Notebook */
         .matches = {
                DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
                DMI_MATCH(DMI_PRODUCT_NAME, "HP ENVY 15 Notebook PC"),
                },
        },
        {
         .callback = video_detect_force_video,
         /* SAMSUNG 870Z5E/880Z5E/680Z5E */
         .matches = {
                DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
                DMI_MATCH(DMI_PRODUCT_NAME, "870Z5E/880Z5E/680Z5E"),
                },
        },
        {
         .callback = video_detect_force_video,
         /* SAMSUNG 370R4E/370R4V/370R5E/3570RE/370R5V */
         .matches = {
                DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
                DMI_MATCH(DMI_PRODUCT_NAME,
                          "370R4E/370R4V/370R5E/3570RE/370R5V"),
                },
        },
        {
         /* https://bugzilla.redhat.com/show_bug.cgi?id=1186097 */
         .callback = video_detect_force_video,
         /* SAMSUNG 3570R/370R/470R/450R/510R/4450RV */
         .matches = {
                DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
                DMI_MATCH(DMI_PRODUCT_NAME,
                          "3570R/370R/470R/450R/510R/4450RV"),
                },
        },
        {
         /* https://bugzilla.redhat.com/show_bug.cgi?id=1557060 */
         .callback = video_detect_force_video,
         /* SAMSUNG 670Z5E */
         .matches = {
                DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
                DMI_MATCH(DMI_PRODUCT_NAME, "670Z5E"),
                },
        },
        {
         /* https://bugzilla.redhat.com/show_bug.cgi?id=1094948 */
         .callback = video_detect_force_video,
         /* SAMSUNG 730U3E/740U3E */
         .matches = {
                DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
                DMI_MATCH(DMI_PRODUCT_NAME, "730U3E/740U3E"),
                },
        },
        {
         /* https://bugs.freedesktop.org/show_bug.cgi?id=87286 */
         .callback = video_detect_force_video,
         /* SAMSUNG 900X3C/900X3D/900X3E/900X4C/900X4D */
         .matches = {
                DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
                DMI_MATCH(DMI_PRODUCT_NAME,
                          "900X3C/900X3D/900X3E/900X4C/900X4D"),
                },
        },
        {
         /* https://bugzilla.redhat.com/show_bug.cgi?id=1272633 */
         .callback = video_detect_force_video,
         /* Dell XPS14 L421X */
         .matches = {
                DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
                DMI_MATCH(DMI_PRODUCT_NAME, "XPS L421X"),
                },
        },
        {
         /* https://bugzilla.redhat.com/show_bug.cgi?id=1163574 */
         .callback = video_detect_force_video,
         /* Dell XPS15 L521X */
         .matches = {
                DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
                DMI_MATCH(DMI_PRODUCT_NAME, "XPS L521X"),
                },
        },
        {
         /* https://bugzilla.kernel.org/show_bug.cgi?id=108971 */
         .callback = video_detect_force_video,
         /* SAMSUNG 530U4E/540U4E */
         .matches = {
                DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
                DMI_MATCH(DMI_PRODUCT_NAME, "530U4E/540U4E"),
                },
        },
        {
         /* https://bugs.launchpad.net/bugs/1894667 */
         .callback = video_detect_force_video,
         /* HP 635 Notebook */
         .matches = {
                DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
                DMI_MATCH(DMI_PRODUCT_NAME, "HP 635 Notebook PC"),
                },
        },

        /* Non win8 machines which need native backlight nevertheless */
        {
         /* https://bugzilla.redhat.com/show_bug.cgi?id=1201530 */
         .callback = video_detect_force_native,
         /* Lenovo Ideapad S405 */
         .matches = {
                DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
                DMI_MATCH(DMI_BOARD_NAME, "Lenovo IdeaPad S405"),
                },
        },
        {
         /* https://bugzilla.suse.com/show_bug.cgi?id=1208724 */
         .callback = video_detect_force_native,
         /* Lenovo Ideapad Z470 */
         .matches = {
                DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
                DMI_MATCH(DMI_PRODUCT_VERSION, "IdeaPad Z470"),
                },
        },
        {
         /* https://bugzilla.redhat.com/show_bug.cgi?id=1187004 */
         .callback = video_detect_force_native,
         /* Lenovo Ideapad Z570 */
         .matches = {
                DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
                DMI_MATCH(DMI_PRODUCT_VERSION, "Ideapad Z570"),
                },
        },
        {
         .callback = video_detect_force_native,
         /* Lenovo E41-25 */
         .matches = {
                DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
                DMI_MATCH(DMI_PRODUCT_NAME, "81FS"),
                },
        },
        {
         .callback = video_detect_force_native,
         /* Lenovo E41-45 */
         .matches = {
                DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
                DMI_MATCH(DMI_PRODUCT_NAME, "82BK"),
                },
        },
        {
         .callback = video_detect_force_native,
         /* Lenovo Slim 7 16ARH7 */
         .matches = {
                DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
                DMI_MATCH(DMI_PRODUCT_NAME, "82UX"),
                },
        },
        {
         .callback = video_detect_force_native,
         /* Lenovo ThinkPad X131e (3371 AMD version) */
         .matches = {
                DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
                DMI_MATCH(DMI_PRODUCT_NAME, "3371"),
                },
        },
        {
         .callback = video_detect_force_native,
         /* Apple iMac11,3 */
         .matches = {
                DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
                DMI_MATCH(DMI_PRODUCT_NAME, "iMac11,3"),
                },
        },
        {
         /* https://gitlab.freedesktop.org/drm/amd/-/issues/1838 */
         .callback = video_detect_force_native,
         /* Apple iMac12,1 */
         .matches = {
                DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
                DMI_MATCH(DMI_PRODUCT_NAME, "iMac12,1"),
                },
        },
        {
         /* https://gitlab.freedesktop.org/drm/amd/-/issues/2753 */
         .callback = video_detect_force_native,
         /* Apple iMac12,2 */
         .matches = {
                DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
                DMI_MATCH(DMI_PRODUCT_NAME, "iMac12,2"),
                },
        },
        {
         .callback = video_detect_force_native,
         /* Apple MacBook Air 7,2 */
         .matches = {
                DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
                DMI_MATCH(DMI_PRODUCT_NAME, "MacBookAir7,2"),
                },
        },
        {
         .callback = video_detect_force_native,
         /* Apple MacBook Air 9,1 */
         .matches = {
                DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
                DMI_MATCH(DMI_PRODUCT_NAME, "MacBookAir9,1"),
                },
        },
        {
         .callback = video_detect_force_native,
         /* Apple MacBook Pro 9,2 */
         .matches = {
                DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
                DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro9,2"),
                },
        },
        {
         .callback = video_detect_force_native,
         /* Apple MacBook Pro 11,2 */
         .matches = {
                DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
                DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro11,2"),
                },
        },
        {
         /* https://bugzilla.redhat.com/show_bug.cgi?id=1217249 */
         .callback = video_detect_force_native,
         /* Apple MacBook Pro 12,1 */
         .matches = {
                DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
                DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro12,1"),
                },
        },
        {
         .callback = video_detect_force_native,
         /* Apple MacBook Pro 16,2 */
         .matches = {
                DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
                DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro16,2"),
                },
        },
        {
         .callback = video_detect_force_native,
         /* Dell Inspiron N4010 */
         .matches = {
                DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
                DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron N4010"),
                },
        },
        {
         .callback = video_detect_force_native,
         /* Dell Vostro V131 */
         .matches = {
                DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
                DMI_MATCH(DMI_PRODUCT_NAME, "Vostro V131"),
                },
        },
        {
         /* https://bugzilla.redhat.com/show_bug.cgi?id=1123661 */
         .callback = video_detect_force_native,
         /* Dell XPS 17 L702X */
         .matches = {
                DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
                DMI_MATCH(DMI_PRODUCT_NAME, "Dell System XPS L702X"),
                },
        },
        {
         .callback = video_detect_force_native,
         /* Dell Precision 7510 */
         .matches = {
                DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
                DMI_MATCH(DMI_PRODUCT_NAME, "Precision 7510"),
                },
        },
        {
         .callback = video_detect_force_native,
         /* Dell Studio 1569 */
         .matches = {
                DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
                DMI_MATCH(DMI_PRODUCT_NAME, "Studio 1569"),
                },
        },
        {
         .callback = video_detect_force_native,
         /* Acer Aspire 3830TG */
         .matches = {
                DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
                DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 3830TG"),
                },
        },
        {
         .callback = video_detect_force_native,
         /* Acer Aspire 4810T */
         .matches = {
                DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
                DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 4810T"),
                },
        },
        {
         .callback = video_detect_force_native,
         /* Acer Aspire 5738z */
         .matches = {
                DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
                DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5738"),
                DMI_MATCH(DMI_BOARD_NAME, "JV50"),
                },
        },
        {
         /* https://bugzilla.redhat.com/show_bug.cgi?id=1012674 */
         .callback = video_detect_force_native,
         /* Acer Aspire 5741 */
         .matches = {
                DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
                DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5741"),
                },
        },
        {
         /* https://bugzilla.kernel.org/show_bug.cgi?id=42993 */
         .callback = video_detect_force_native,
         /* Acer Aspire 5750 */
         .matches = {
                DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
                DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5750"),
                },
        },
        {
         /* https://bugzilla.kernel.org/show_bug.cgi?id=42833 */
         .callback = video_detect_force_native,
         /* Acer Extensa 5235 */
         .matches = {
                DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
                DMI_MATCH(DMI_PRODUCT_NAME, "Extensa 5235"),
                },
        },
        {
         .callback = video_detect_force_native,
         /* Acer TravelMate 4750 */
         .matches = {
                DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
                DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate 4750"),
                },
        },
        {
         /* https://bugzilla.kernel.org/show_bug.cgi?id=207835 */
         .callback = video_detect_force_native,
         /* Acer TravelMate 5735Z */
         .matches = {
                DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
                DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate 5735Z"),
                DMI_MATCH(DMI_BOARD_NAME, "BA51_MV"),
                },
        },
        {
         /* https://bugzilla.kernel.org/show_bug.cgi?id=36322 */
         .callback = video_detect_force_native,
         /* Acer TravelMate 5760 */
         .matches = {
                DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
                DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate 5760"),
                },
        },
        {
         .callback = video_detect_force_native,
         /* ASUSTeK COMPUTER INC. GA401 */
         .matches = {
                DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
                DMI_MATCH(DMI_PRODUCT_NAME, "GA401"),
                },
        },
        {
         .callback = video_detect_force_native,
         /* ASUSTeK COMPUTER INC. GA502 */
         .matches = {
                DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
                DMI_MATCH(DMI_PRODUCT_NAME, "GA502"),
                },
        },
        {
         .callback = video_detect_force_native,
         /* ASUSTeK COMPUTER INC. GA503 */
         .matches = {
                DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
                DMI_MATCH(DMI_PRODUCT_NAME, "GA503"),
                },
        },
        {
         .callback = video_detect_force_native,
         /* Asus U46E */
         .matches = {
                DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
                DMI_MATCH(DMI_PRODUCT_NAME, "U46E"),
                },
        },
        {
         .callback = video_detect_force_native,
         /* Asus UX303UB */
         .matches = {
                DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
                DMI_MATCH(DMI_PRODUCT_NAME, "UX303UB"),
                },
        },
        {
         .callback = video_detect_force_native,
         /* HP EliteBook 8460p */
         .matches = {
                DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
                DMI_MATCH(DMI_PRODUCT_NAME, "HP EliteBook 8460p"),
                },
        },
        {
         .callback = video_detect_force_native,
         /* HP Pavilion g6-1d80nr / B4U19UA */
         .matches = {
                DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
                DMI_MATCH(DMI_PRODUCT_NAME, "HP Pavilion g6 Notebook PC"),
                DMI_MATCH(DMI_PRODUCT_SKU, "B4U19UA"),
                },
        },
        {
         .callback = video_detect_force_native,
         /* Samsung N150P */
         .matches = {
                DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
                DMI_MATCH(DMI_PRODUCT_NAME, "N150P"),
                DMI_MATCH(DMI_BOARD_NAME, "N150P"),
                },
        },
        {
         .callback = video_detect_force_native,
         /* Samsung N145P/N250P/N260P */
         .matches = {
                DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
                DMI_MATCH(DMI_PRODUCT_NAME, "N145P/N250P/N260P"),
                DMI_MATCH(DMI_BOARD_NAME, "N145P/N250P/N260P"),
                },
        },
        {
         .callback = video_detect_force_native,
         /* Samsung N250P */
         .matches = {
                DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
                DMI_MATCH(DMI_PRODUCT_NAME, "N250P"),
                DMI_MATCH(DMI_BOARD_NAME, "N250P"),
                },
        },
        {
         /* https://bugzilla.kernel.org/show_bug.cgi?id=202401 */
         .callback = video_detect_force_native,
         /* Sony Vaio VPCEH3U1E */
         .matches = {
                DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
                DMI_MATCH(DMI_PRODUCT_NAME, "VPCEH3U1E"),
                },
        },
        {
         .callback = video_detect_force_native,
         /* Sony Vaio VPCY11S1E */
         .matches = {
                DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
                DMI_MATCH(DMI_PRODUCT_NAME, "VPCY11S1E"),
                },
        },

        /*
         * These Toshibas have a broken acpi-video interface for brightness
         * control. They also have an issue where the panel is off after
         * suspend until a special firmware call is made to turn it back
         * on. This is handled by the toshiba_acpi kernel module, so that
         * module must be enabled for these models to work correctly.
         */
        {
         /* https://bugzilla.kernel.org/show_bug.cgi?id=21012 */
         .callback = video_detect_force_native,
         /* Toshiba Portégé R700 */
         .matches = {
                DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
                DMI_MATCH(DMI_PRODUCT_NAME, "PORTEGE R700"),
                },
        },
        {
         /* Portégé: https://bugs.freedesktop.org/show_bug.cgi?id=82634 */
         /* Satellite: https://bugzilla.kernel.org/show_bug.cgi?id=21012 */
         .callback = video_detect_force_native,
         /* Toshiba Satellite/Portégé R830 */
         .matches = {
                DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
                DMI_MATCH(DMI_PRODUCT_NAME, "R830"),
                },
        },
        {
         .callback = video_detect_force_native,
         /* Toshiba Satellite/Portégé Z830 */
         .matches = {
                DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
                DMI_MATCH(DMI_PRODUCT_NAME, "Z830"),
                },
        },

        /*
         * Dell AIO (All in Ones) which advertise an UART attached backlight
         * controller board in their ACPI tables (and may even have one), but
         * which need native backlight control nevertheless.
         */
        {
         /* https://github.com/zabbly/linux/issues/26 */
         .callback = video_detect_force_native,
         /* Dell OptiPlex 5480 AIO */
         .matches = {
                DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
                DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 5480 AIO"),
                },
        },
        {
         /* https://bugzilla.redhat.com/show_bug.cgi?id=2303936 */
         .callback = video_detect_force_native,
         /* Dell OptiPlex 7760 AIO */
         .matches = {
                DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
                DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 7760 AIO"),
                },
        },

        /*
         * Models which have nvidia-ec-wmi support, but should not use it.
         * Note this indicates a likely firmware bug on these models and should
         * be revisited if/when Linux gets support for dynamic mux mode.
         */
        {
         .callback = video_detect_force_native,
         /* Dell G15 5515 */
         .matches = {
                DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
                DMI_MATCH(DMI_PRODUCT_NAME, "Dell G15 5515"),
                },
        },
        {
         .callback = video_detect_force_native,
         .matches = {
                DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
                DMI_MATCH(DMI_PRODUCT_NAME, "Vostro 15 3535"),
                },
        },

        /*
         * x86 android tablets which directly control the backlight through
         * an external backlight controller, typically TI's LP8557.
         * The backlight is directly controlled by the lp855x driver on these.
         * This setup means that neither i915's native nor acpi_video backlight
         * control works. Add a "vendor" quirk to disable both. Note these
         * devices do not use vendor control in the typical meaning of
         * vendor specific SMBIOS or ACPI calls being used.
         */
        {
         .callback = video_detect_force_vendor,
         /* Lenovo Yoga Book X90F / X90L */
         .matches = {
                DMI_EXACT_MATCH(DMI_SYS_VENDOR, "Intel Corporation"),
                DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "CHERRYVIEW D1 PLATFORM"),
                DMI_EXACT_MATCH(DMI_PRODUCT_VERSION, "YETI-11"),
                },
        },
        {
         .callback = video_detect_force_vendor,
         /*
          * Lenovo Yoga Tablet 2 830F/L or 1050F/L (The 8" and 10"
          * Lenovo Yoga Tablet 2 use the same mainboard)
          */
         .matches = {
                DMI_MATCH(DMI_SYS_VENDOR, "Intel Corp."),
                DMI_MATCH(DMI_PRODUCT_NAME, "VALLEYVIEW C0 PLATFORM"),
                DMI_MATCH(DMI_BOARD_NAME, "BYT-T FFD8"),
                /* Partial match on beginning of BIOS version */
                DMI_MATCH(DMI_BIOS_VERSION, "BLADE_21"),
                },
        },
        {
         .callback = video_detect_force_vendor,
         /* Lenovo Yoga Tab 3 Pro YT3-X90F */
         .matches = {
                DMI_MATCH(DMI_SYS_VENDOR, "Intel Corporation"),
                DMI_MATCH(DMI_PRODUCT_VERSION, "Blade3-10A-001"),
                },
        },
        {
         .callback = video_detect_force_vendor,
         /* Xiaomi Mi Pad 2 */
         .matches = {
                DMI_MATCH(DMI_SYS_VENDOR, "Xiaomi Inc"),
                DMI_MATCH(DMI_PRODUCT_NAME, "Mipad2"),
                },
        },
        /* https://gitlab.freedesktop.org/drm/amd/-/issues/4512 */
        {
         .callback = video_detect_force_native,
         .matches = {
                DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
                DMI_MATCH(DMI_PRODUCT_NAME, "82K8"),
                },
        },
        { },
};

static bool google_cros_ec_present(void)
{
        return acpi_dev_found("GOOG0004") || acpi_dev_found("GOOG000C");
}

/*
 * Windows 8 and newer no longer use the ACPI video interface, so it often
 * does not work. So on win8+ systems prefer native brightness control.
 * Chromebooks should always prefer native backlight control.
 */
static bool prefer_native_over_acpi_video(void)
{
        return acpi_osi_is_win8() || google_cros_ec_present();
}

/*
 * Determine which type of backlight interface to use on this system,
 * First check cmdline, then dmi quirks, then do autodetect.
 */
enum acpi_backlight_type __acpi_video_get_backlight_type(bool native, bool *auto_detect)
{
        static DEFINE_MUTEX(init_mutex);
        static bool nvidia_wmi_ec_present;
        static bool apple_gmux_present;
        static bool dell_uart_present;
        static bool native_available;
        static bool init_done;
        static long video_caps;

        /* Parse cmdline, dmi and acpi only once */
        mutex_lock(&init_mutex);
        if (!init_done) {
                acpi_video_parse_cmdline();
                dmi_check_system(video_detect_dmi_table);
                acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
                                    ACPI_UINT32_MAX, find_video, NULL,
                                    &video_caps, NULL);
                nvidia_wmi_ec_present = nvidia_wmi_ec_supported();
                apple_gmux_present = apple_gmux_detect(NULL, NULL);
                dell_uart_present = acpi_dev_present("DELL0501", NULL, -1);
                init_done = true;
        }
        if (native)
                native_available = true;
        mutex_unlock(&init_mutex);

        if (auto_detect)
                *auto_detect = false;

        /*
         * The below heuristics / detection steps are in order of descending
         * presedence. The commandline takes presedence over anything else.
         */
        if (acpi_backlight_cmdline != acpi_backlight_undef)
                return acpi_backlight_cmdline;

        /* DMI quirks override any autodetection. */
        if (acpi_backlight_dmi != acpi_backlight_undef)
                return acpi_backlight_dmi;

        if (auto_detect)
                *auto_detect = true;

        /* Special cases such as nvidia_wmi_ec and apple gmux. */
        if (nvidia_wmi_ec_present)
                return acpi_backlight_nvidia_wmi_ec;

        if (apple_gmux_present)
                return acpi_backlight_apple_gmux;

        if (dell_uart_present)
                return acpi_backlight_dell_uart;

        /* Use ACPI video if available, except when native should be preferred. */
        if ((video_caps & ACPI_VIDEO_BACKLIGHT) &&
             !(native_available && prefer_native_over_acpi_video()))
                return acpi_backlight_video;

        /* Use native if available */
        if (native_available)
                return acpi_backlight_native;

        /*
         * The vendor specific BIOS interfaces are only necessary for
         * laptops from before ~2008.
         *
         * For laptops from ~2008 till ~2023 this point is never reached
         * because on those (video_caps & ACPI_VIDEO_BACKLIGHT) above is true.
         *
         * Laptops from after ~2023 no longer support ACPI_VIDEO_BACKLIGHT,
         * if this point is reached on those, this likely means that
         * the GPU kms driver which sets native_available has not loaded yet.
         *
         * Returning acpi_backlight_vendor in this case is known to sometimes
         * cause a non working vendor specific /sys/class/backlight device to
         * get registered.
         *
         * Return acpi_backlight_none on laptops with ACPI tables written
         * for Windows 8 (laptops from after ~2012) to avoid this problem.
         */
        if (acpi_osi_is_win8())
                return acpi_backlight_none;

        /* No ACPI video/native (old hw), use vendor specific fw methods. */
        return acpi_backlight_vendor;
}
EXPORT_SYMBOL(__acpi_video_get_backlight_type);