Merge tag 'trace-printf-v6.13' of git://git.kernel.org/pub/scm/linux/kernel/git/trace...

[drm/drm-misc.git] / drivers / acpi / x86 / utils.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * X86 ACPI Utility Functions
 *
 * Copyright (C) 2017 Hans de Goede <hdegoede@redhat.com>
 *
 * Based on various non upstream patches to support the CHT Whiskey Cove PMIC:
 * Copyright (C) 2013-2015 Intel Corporation. All rights reserved.
 */

#define pr_fmt(fmt) "ACPI: " fmt

#include <linux/acpi.h>
#include <linux/dmi.h>
#include <linux/pci.h>
#include <linux/platform_device.h>
#include <asm/cpu_device_id.h>
#include <asm/intel-family.h>
#include "../internal.h"

/*
 * Some ACPI devices are hidden (status == 0x0) in recent BIOS-es because
 * some recent Windows drivers bind to one device but poke at multiple
 * devices at the same time, so the others get hidden.
 *
 * Some BIOS-es (temporarily) hide specific APCI devices to work around Windows
 * driver bugs. We use DMI matching to match known cases of this.
 *
 * Likewise sometimes some not-actually present devices are sometimes
 * reported as present, which may cause issues.
 *
 * We work around this by using the below quirk list to override the status
 * reported by the _STA method with a fixed value (ACPI_STA_DEFAULT or 0).
 * Note this MUST only be done for devices where this is safe.
 *
 * This status overriding is limited to specific CPU (SoC) models both to
 * avoid potentially causing trouble on other models and because some HIDs
 * are re-used on different SoCs for completely different devices.
 */
struct override_status_id {
        struct acpi_device_id hid[2];
        struct x86_cpu_id cpu_ids[2];
        struct dmi_system_id dmi_ids[2]; /* Optional */
        const char *uid;
        const char *path;
        unsigned long long status;
};

#define ENTRY(status, hid, uid, path, cpu_vfm, dmi...) {                \
        { { hid, }, {} },                                               \
        { X86_MATCH_VFM(cpu_vfm, NULL), {} },                           \
        { { .matches = dmi }, {} },                                     \
        uid,                                                            \
        path,                                                           \
        status,                                                         \
}

#define PRESENT_ENTRY_HID(hid, uid, cpu_vfm, dmi...) \
        ENTRY(ACPI_STA_DEFAULT, hid, uid, NULL, cpu_vfm, dmi)

#define NOT_PRESENT_ENTRY_HID(hid, uid, cpu_vfm, dmi...) \
        ENTRY(0, hid, uid, NULL, cpu_vfm, dmi)

#define PRESENT_ENTRY_PATH(path, cpu_vfm, dmi...) \
        ENTRY(ACPI_STA_DEFAULT, "", NULL, path, cpu_vfm, dmi)

#define NOT_PRESENT_ENTRY_PATH(path, cpu_vfm, dmi...) \
        ENTRY(0, "", NULL, path, cpu_vfm, dmi)

static const struct override_status_id override_status_ids[] = {
        /*
         * Bay / Cherry Trail PWM directly poked by GPU driver in win10,
         * but Linux uses a separate PWM driver, harmless if not used.
         */
        PRESENT_ENTRY_HID("80860F09", "1", INTEL_ATOM_SILVERMONT, {}),
        PRESENT_ENTRY_HID("80862288", "1", INTEL_ATOM_AIRMONT, {}),

        /* The Xiaomi Mi Pad 2 uses PWM2 for touchkeys backlight control */
        PRESENT_ENTRY_HID("80862289", "2", INTEL_ATOM_AIRMONT, {
                DMI_MATCH(DMI_SYS_VENDOR, "Xiaomi Inc"),
                DMI_MATCH(DMI_PRODUCT_NAME, "Mipad2"),
              }),

        /*
         * The INT0002 device is necessary to clear wakeup interrupt sources
         * on Cherry Trail devices, without it we get nobody cared IRQ msgs.
         */
        PRESENT_ENTRY_HID("INT0002", "1", INTEL_ATOM_AIRMONT, {}),
        /*
         * On the Dell Venue 11 Pro 7130 and 7139, the DSDT hides
         * the touchscreen ACPI device until a certain time
         * after _SB.PCI0.GFX0.LCD.LCD1._ON gets called has passed
         * *and* _STA has been called at least 3 times since.
         */
        PRESENT_ENTRY_HID("SYNA7500", "1", INTEL_HASWELL_L, {
                DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
                DMI_MATCH(DMI_PRODUCT_NAME, "Venue 11 Pro 7130"),
              }),
        PRESENT_ENTRY_HID("SYNA7500", "1", INTEL_HASWELL_L, {
                DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
                DMI_MATCH(DMI_PRODUCT_NAME, "Venue 11 Pro 7139"),
              }),

        /*
         * The Dell XPS 15 9550 has a SMO8110 accelerometer /
         * HDD freefall sensor which is wrongly marked as not present.
         */
        PRESENT_ENTRY_HID("SMO8810", "1", INTEL_SKYLAKE, {
                DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
                DMI_MATCH(DMI_PRODUCT_NAME, "XPS 15 9550"),
              }),

        /*
         * The GPD win BIOS dated 20170221 has disabled the accelerometer, the
         * drivers sometimes cause crashes under Windows and this is how the
         * manufacturer has solved this :|  The DMI match may not seem unique,
         * but it is. In the 67000+ DMI decode dumps from linux-hardware.org
         * only 116 have board_vendor set to "AMI Corporation" and of those 116
         * only the GPD win and pocket entries' board_name is "Default string".
         *
         * Unfortunately the GPD pocket also uses these strings and its BIOS
         * was copy-pasted from the GPD win, so it has a disabled KIOX000A
         * node which we should not enable, thus we also check the BIOS date.
         */
        PRESENT_ENTRY_HID("KIOX000A", "1", INTEL_ATOM_AIRMONT, {
                DMI_MATCH(DMI_BOARD_VENDOR, "AMI Corporation"),
                DMI_MATCH(DMI_BOARD_NAME, "Default string"),
                DMI_MATCH(DMI_PRODUCT_NAME, "Default string"),
                DMI_MATCH(DMI_BIOS_DATE, "02/21/2017")
              }),
        PRESENT_ENTRY_HID("KIOX000A", "1", INTEL_ATOM_AIRMONT, {
                DMI_MATCH(DMI_BOARD_VENDOR, "AMI Corporation"),
                DMI_MATCH(DMI_BOARD_NAME, "Default string"),
                DMI_MATCH(DMI_PRODUCT_NAME, "Default string"),
                DMI_MATCH(DMI_BIOS_DATE, "03/20/2017")
              }),
        PRESENT_ENTRY_HID("KIOX000A", "1", INTEL_ATOM_AIRMONT, {
                DMI_MATCH(DMI_BOARD_VENDOR, "AMI Corporation"),
                DMI_MATCH(DMI_BOARD_NAME, "Default string"),
                DMI_MATCH(DMI_PRODUCT_NAME, "Default string"),
                DMI_MATCH(DMI_BIOS_DATE, "05/25/2017")
              }),

        /*
         * The GPD win/pocket have a PCI wifi card, but its DSDT has the SDIO
         * mmc controller enabled and that has a child-device which _PS3
         * method sets a GPIO causing the PCI wifi card to turn off.
         * See above remark about uniqueness of the DMI match.
         */
        NOT_PRESENT_ENTRY_PATH("\\_SB_.PCI0.SDHB.BRC1", INTEL_ATOM_AIRMONT, {
                DMI_EXACT_MATCH(DMI_BOARD_VENDOR, "AMI Corporation"),
                DMI_EXACT_MATCH(DMI_BOARD_NAME, "Default string"),
                DMI_EXACT_MATCH(DMI_BOARD_SERIAL, "Default string"),
                DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Default string"),
              }),

        /*
         * The LSM303D on the Lenovo Yoga Tablet 2 series is present
         * as both ACCL0001 and MAGN0001. As we can only ever register an
         * i2c client for one of them, ignore MAGN0001.
         */
        NOT_PRESENT_ENTRY_HID("MAGN0001", "1", INTEL_ATOM_SILVERMONT, {
                DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
                DMI_MATCH(DMI_PRODUCT_FAMILY, "YOGATablet2"),
              }),
};

bool acpi_device_override_status(struct acpi_device *adev, unsigned long long *status)
{
        bool ret = false;
        unsigned int i;

        for (i = 0; i < ARRAY_SIZE(override_status_ids); i++) {
                if (!x86_match_cpu(override_status_ids[i].cpu_ids))
                        continue;

                if (override_status_ids[i].dmi_ids[0].matches[0].slot &&
                    !dmi_check_system(override_status_ids[i].dmi_ids))
                        continue;

                if (override_status_ids[i].path) {
                        struct acpi_buffer path = { ACPI_ALLOCATE_BUFFER, NULL };
                        bool match;

                        if (acpi_get_name(adev->handle, ACPI_FULL_PATHNAME, &path))
                                continue;

                        match = strcmp((char *)path.pointer, override_status_ids[i].path) == 0;
                        kfree(path.pointer);

                        if (!match)
                                continue;
                } else {
                        if (acpi_match_device_ids(adev, override_status_ids[i].hid))
                                continue;

                        if (!acpi_dev_uid_match(adev, override_status_ids[i].uid))
                                continue;
                }

                *status = override_status_ids[i].status;
                ret = true;
                break;
        }

        return ret;
}

/*
 * AMD systems from Renoir onwards *require* that the NVME controller
 * is put into D3 over a Modern Standby / suspend-to-idle cycle.
 *
 * This is "typically" accomplished using the `StorageD3Enable`
 * property in the _DSD that is checked via the `acpi_storage_d3` function
 * but some OEM systems still don't have it in their BIOS.
 *
 * The Microsoft documentation for StorageD3Enable mentioned that Windows has
 * a hardcoded allowlist for D3 support as well as a registry key to override
 * the BIOS, which has been used for these cases.
 *
 * This allows quirking on Linux in a similar fashion.
 *
 * Cezanne systems shouldn't *normally* need this as the BIOS includes
 * StorageD3Enable.  But for two reasons we have added it.
 * 1) The BIOS on a number of Dell systems have ambiguity
 *    between the same value used for _ADR on ACPI nodes GPP1.DEV0 and GPP1.NVME.
 *    GPP1.NVME is needed to get StorageD3Enable node set properly.
 *    https://bugzilla.kernel.org/show_bug.cgi?id=216440
 *    https://bugzilla.kernel.org/show_bug.cgi?id=216773
 *    https://bugzilla.kernel.org/show_bug.cgi?id=217003
 * 2) On at least one HP system StorageD3Enable is missing on the second NVME
 *    disk in the system.
 * 3) On at least one HP Rembrandt system StorageD3Enable is missing on the only
 *    NVME device.
 */
bool force_storage_d3(void)
{
        if (!cpu_feature_enabled(X86_FEATURE_ZEN))
                return false;
        return acpi_gbl_FADT.flags & ACPI_FADT_LOW_POWER_S0;
}

/*
 * x86 ACPI boards which ship with only Android as their factory image usually
 * declare a whole bunch of bogus I2C devices in their ACPI tables and sometimes
 * there are issues with serdev devices on these boards too, e.g. the resource
 * points to the wrong serdev_controller.
 *
 * Instantiating I2C / serdev devs for these bogus devs causes various issues,
 * e.g. GPIO/IRQ resource conflicts because sometimes drivers do bind to them.
 * The Android x86 kernel fork shipped on these devices has some special code
 * to remove the bogus I2C clients (and AFAICT serdevs are ignored completely).
 *
 * The acpi_quirk_skip_*_enumeration() functions below are used by the I2C or
 * serdev code to skip instantiating any I2C or serdev devs on broken boards.
 *
 * In case of I2C an exception is made for HIDs on the i2c_acpi_known_good_ids
 * list. These are known to always be correct (and in case of the audio-codecs
 * the drivers heavily rely on the codec being enumerated through ACPI).
 *
 * Note these boards typically do actually have I2C and serdev devices,
 * just different ones then the ones described in their DSDT. The devices
 * which are actually present are manually instantiated by the
 * drivers/platform/x86/x86-android-tablets.c kernel module.
 */
#define ACPI_QUIRK_SKIP_I2C_CLIENTS                             BIT(0)
#define ACPI_QUIRK_UART1_SKIP                                   BIT(1)
#define ACPI_QUIRK_UART1_TTY_UART2_SKIP                         BIT(2)
#define ACPI_QUIRK_PNP_UART1_SKIP                               BIT(3)
#define ACPI_QUIRK_SKIP_ACPI_AC_AND_BATTERY                     BIT(4)
#define ACPI_QUIRK_USE_ACPI_AC_AND_BATTERY                      BIT(5)
#define ACPI_QUIRK_SKIP_GPIO_EVENT_HANDLERS                     BIT(6)

static const struct dmi_system_id acpi_quirk_skip_dmi_ids[] = {
        /*
         * 1. Devices with only the skip / don't-skip AC and battery quirks,
         *    sorted alphabetically.
         */
        {
                /* ECS EF20EA, AXP288 PMIC but uses separate fuel-gauge */
                .matches = {
                        DMI_MATCH(DMI_PRODUCT_NAME, "EF20EA"),
                },
                .driver_data = (void *)ACPI_QUIRK_USE_ACPI_AC_AND_BATTERY
        },
        {
                /* Lenovo Ideapad Miix 320, AXP288 PMIC, separate fuel-gauge */
                .matches = {
                        DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
                        DMI_MATCH(DMI_PRODUCT_NAME, "80XF"),
                        DMI_MATCH(DMI_PRODUCT_VERSION, "Lenovo MIIX 320-10ICR"),
                },
                .driver_data = (void *)ACPI_QUIRK_USE_ACPI_AC_AND_BATTERY
        },

        /*
         * 2. Devices which also have the skip i2c/serdev quirks and which
         *    need the x86-android-tablets module to properly work.
         *    Sorted alphabetically.
         */
#if IS_ENABLED(CONFIG_X86_ANDROID_TABLETS)
        {
                /* Acer Iconia One 7 B1-750 */
                .matches = {
                        DMI_MATCH(DMI_SYS_VENDOR, "Insyde"),
                        DMI_MATCH(DMI_PRODUCT_NAME, "VESPA2"),
                },
                .driver_data = (void *)(ACPI_QUIRK_SKIP_I2C_CLIENTS |
                                        ACPI_QUIRK_SKIP_ACPI_AC_AND_BATTERY |
                                        ACPI_QUIRK_SKIP_GPIO_EVENT_HANDLERS),
        },
        {
                /* Acer Iconia One 8 A1-840 (non FHD version) */
                .matches = {
                        DMI_MATCH(DMI_SYS_VENDOR, "Insyde"),
                        DMI_MATCH(DMI_PRODUCT_NAME, "BayTrail"),
                        /* Above strings are too generic also match BIOS date */
                        DMI_MATCH(DMI_BIOS_DATE, "04/01/2014"),
                },
                .driver_data = (void *)(ACPI_QUIRK_SKIP_I2C_CLIENTS |
                                        ACPI_QUIRK_SKIP_ACPI_AC_AND_BATTERY |
                                        ACPI_QUIRK_SKIP_GPIO_EVENT_HANDLERS),
        },
        {
                /* Asus ME176C tablet */
                .matches = {
                        DMI_EXACT_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
                        DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "ME176C"),
                },
                .driver_data = (void *)(ACPI_QUIRK_SKIP_I2C_CLIENTS |
                                        ACPI_QUIRK_UART1_TTY_UART2_SKIP |
                                        ACPI_QUIRK_SKIP_ACPI_AC_AND_BATTERY |
                                        ACPI_QUIRK_SKIP_GPIO_EVENT_HANDLERS),
        },
        {
                /* Asus TF103C transformer 2-in-1 */
                .matches = {
                        DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
                        DMI_MATCH(DMI_PRODUCT_NAME, "TF103C"),
                },
                .driver_data = (void *)(ACPI_QUIRK_SKIP_I2C_CLIENTS |
                                        ACPI_QUIRK_SKIP_ACPI_AC_AND_BATTERY |
                                        ACPI_QUIRK_SKIP_GPIO_EVENT_HANDLERS),
        },
        {
                /* Lenovo Yoga Book X90F/L */
                .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"),
                },
                .driver_data = (void *)(ACPI_QUIRK_SKIP_I2C_CLIENTS |
                                        ACPI_QUIRK_UART1_SKIP |
                                        ACPI_QUIRK_SKIP_ACPI_AC_AND_BATTERY |
                                        ACPI_QUIRK_SKIP_GPIO_EVENT_HANDLERS),
        },
        {
                /* Lenovo Yoga Tablet 2 1050F/L */
                .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"),
                },
                .driver_data = (void *)(ACPI_QUIRK_SKIP_I2C_CLIENTS |
                                        ACPI_QUIRK_PNP_UART1_SKIP |
                                        ACPI_QUIRK_SKIP_ACPI_AC_AND_BATTERY),
        },
        {
                /* Lenovo Yoga Tab 3 Pro X90F */
                .matches = {
                        DMI_MATCH(DMI_SYS_VENDOR, "Intel Corporation"),
                        DMI_MATCH(DMI_PRODUCT_VERSION, "Blade3-10A-001"),
                },
                .driver_data = (void *)(ACPI_QUIRK_SKIP_I2C_CLIENTS |
                                        ACPI_QUIRK_SKIP_ACPI_AC_AND_BATTERY),
        },
        {
                /* Medion Lifetab S10346 */
                .matches = {
                        DMI_MATCH(DMI_BOARD_VENDOR, "AMI Corporation"),
                        DMI_MATCH(DMI_BOARD_NAME, "Aptio CRB"),
                        /* Way too generic, also match on BIOS data */
                        DMI_MATCH(DMI_BIOS_DATE, "10/22/2015"),
                },
                .driver_data = (void *)(ACPI_QUIRK_SKIP_I2C_CLIENTS |
                                        ACPI_QUIRK_SKIP_ACPI_AC_AND_BATTERY),
        },
        {
                /* Nextbook Ares 8 (BYT version)*/
                .matches = {
                        DMI_MATCH(DMI_SYS_VENDOR, "Insyde"),
                        DMI_MATCH(DMI_PRODUCT_NAME, "M890BAP"),
                },
                .driver_data = (void *)(ACPI_QUIRK_SKIP_I2C_CLIENTS |
                                        ACPI_QUIRK_SKIP_ACPI_AC_AND_BATTERY |
                                        ACPI_QUIRK_SKIP_GPIO_EVENT_HANDLERS),
        },
        {
                /* Nextbook Ares 8A (CHT version)*/
                .matches = {
                        DMI_MATCH(DMI_SYS_VENDOR, "Insyde"),
                        DMI_MATCH(DMI_PRODUCT_NAME, "CherryTrail"),
                        DMI_MATCH(DMI_BIOS_VERSION, "M882"),
                },
                .driver_data = (void *)(ACPI_QUIRK_SKIP_I2C_CLIENTS |
                                        ACPI_QUIRK_SKIP_ACPI_AC_AND_BATTERY),
        },
        {
                /* Vexia Edu Atla 10 tablet 9V version */
                .matches = {
                        DMI_MATCH(DMI_BOARD_VENDOR, "AMI Corporation"),
                        DMI_MATCH(DMI_BOARD_NAME, "Aptio CRB"),
                        /* Above strings are too generic, also match on BIOS date */
                        DMI_MATCH(DMI_BIOS_DATE, "08/25/2014"),
                },
                .driver_data = (void *)(ACPI_QUIRK_SKIP_I2C_CLIENTS |
                                        ACPI_QUIRK_UART1_SKIP |
                                        ACPI_QUIRK_SKIP_ACPI_AC_AND_BATTERY |
                                        ACPI_QUIRK_SKIP_GPIO_EVENT_HANDLERS),
        },
        {
                /* Whitelabel (sold as various brands) TM800A550L */
                .matches = {
                        DMI_MATCH(DMI_BOARD_VENDOR, "AMI Corporation"),
                        DMI_MATCH(DMI_BOARD_NAME, "Aptio CRB"),
                        /* Above strings are too generic, also match on BIOS version */
                        DMI_MATCH(DMI_BIOS_VERSION, "ZY-8-BI-PX4S70VTR400-X423B-005-D"),
                },
                .driver_data = (void *)(ACPI_QUIRK_SKIP_I2C_CLIENTS |
                                        ACPI_QUIRK_SKIP_ACPI_AC_AND_BATTERY),
        },
#endif
        {}
};

#if IS_ENABLED(CONFIG_X86_ANDROID_TABLETS)
static const struct acpi_device_id i2c_acpi_known_good_ids[] = {
        { "10EC5640", 0 }, /* RealTek ALC5640 audio codec */
        { "10EC5651", 0 }, /* RealTek ALC5651 audio codec */
        { "INT33F4", 0 },  /* X-Powers AXP288 PMIC */
        { "INT33F5", 0 },  /* TI Dollar Cove PMIC */
        { "INT33FD", 0 },  /* Intel Crystal Cove PMIC */
        { "INT34D3", 0 },  /* Intel Whiskey Cove PMIC */
        { "NPCE69A", 0 },  /* Asus Transformer keyboard dock */
        {}
};

bool acpi_quirk_skip_i2c_client_enumeration(struct acpi_device *adev)
{
        const struct dmi_system_id *dmi_id;
        long quirks;

        dmi_id = dmi_first_match(acpi_quirk_skip_dmi_ids);
        if (!dmi_id)
                return false;

        quirks = (unsigned long)dmi_id->driver_data;
        if (!(quirks & ACPI_QUIRK_SKIP_I2C_CLIENTS))
                return false;

        return acpi_match_device_ids(adev, i2c_acpi_known_good_ids);
}
EXPORT_SYMBOL_GPL(acpi_quirk_skip_i2c_client_enumeration);

static int acpi_dmi_skip_serdev_enumeration(struct device *controller_parent, bool *skip)
{
        struct acpi_device *adev = ACPI_COMPANION(controller_parent);
        const struct dmi_system_id *dmi_id;
        long quirks = 0;
        u64 uid = 0;

        dmi_id = dmi_first_match(acpi_quirk_skip_dmi_ids);
        if (!dmi_id)
                return 0;

        quirks = (unsigned long)dmi_id->driver_data;

        /* uid is left at 0 on errors and 0 is not a valid UART UID */
        acpi_dev_uid_to_integer(adev, &uid);

        /* For PCI UARTs without an UID */
        if (!uid && dev_is_pci(controller_parent)) {
                struct pci_dev *pdev = to_pci_dev(controller_parent);

                /*
                 * Devfn values for PCI UARTs on Bay Trail SoCs, which are
                 * the only devices where this fallback is necessary.
                 */
                if (pdev->devfn == PCI_DEVFN(0x1e, 3))
                        uid = 1;
                else if (pdev->devfn == PCI_DEVFN(0x1e, 4))
                        uid = 2;
        }

        if (!uid)
                return 0;

        if (!dev_is_platform(controller_parent) && !dev_is_pci(controller_parent)) {
                /* PNP enumerated UARTs */
                if ((quirks & ACPI_QUIRK_PNP_UART1_SKIP) && uid == 1)
                        *skip = true;

                return 0;
        }

        if ((quirks & ACPI_QUIRK_UART1_SKIP) && uid == 1)
                *skip = true;

        if (quirks & ACPI_QUIRK_UART1_TTY_UART2_SKIP) {
                if (uid == 1)
                        return -ENODEV; /* Create tty cdev instead of serdev */

                if (uid == 2)
                        *skip = true;
        }

        return 0;
}

bool acpi_quirk_skip_gpio_event_handlers(void)
{
        const struct dmi_system_id *dmi_id;
        long quirks;

        dmi_id = dmi_first_match(acpi_quirk_skip_dmi_ids);
        if (!dmi_id)
                return false;

        quirks = (unsigned long)dmi_id->driver_data;
        return (quirks & ACPI_QUIRK_SKIP_GPIO_EVENT_HANDLERS);
}
EXPORT_SYMBOL_GPL(acpi_quirk_skip_gpio_event_handlers);
#else
static int acpi_dmi_skip_serdev_enumeration(struct device *controller_parent, bool *skip)
{
        return 0;
}
#endif

int acpi_quirk_skip_serdev_enumeration(struct device *controller_parent, bool *skip)
{
        struct acpi_device *adev = ACPI_COMPANION(controller_parent);

        *skip = false;

        /*
         * The DELL0501 ACPI HID represents an UART (CID is set to PNP0501) with
         * a backlight-controller attached. There is no separate ACPI device with
         * an UartSerialBusV2() resource to model the backlight-controller.
         * Set skip to true so that the tty core creates a serdev ctrl device.
         * The backlight driver will manually create the serdev client device.
         */
        if (adev && acpi_dev_hid_match(adev, "DELL0501")) {
                *skip = true;
                /*
                 * Create a platform dev for dell-uart-backlight to bind to.
                 * This is a static device, so no need to store the result.
                 */
                platform_device_register_simple("dell-uart-backlight", PLATFORM_DEVID_NONE,
                                                NULL, 0);
                return 0;
        }

        return acpi_dmi_skip_serdev_enumeration(controller_parent, skip);
}
EXPORT_SYMBOL_GPL(acpi_quirk_skip_serdev_enumeration);

/* Lists of PMIC ACPI HIDs with an (often better) native charger driver */
static const struct {
        const char *hid;
        int hrv;
} acpi_skip_ac_and_battery_pmic_ids[] = {
        { "INT33F4", -1 }, /* X-Powers AXP288 PMIC */
        { "INT34D3",  3 }, /* Intel Cherrytrail Whiskey Cove PMIC */
};

bool acpi_quirk_skip_acpi_ac_and_battery(void)
{
        const struct dmi_system_id *dmi_id;
        long quirks = 0;
        int i;

        dmi_id = dmi_first_match(acpi_quirk_skip_dmi_ids);
        if (dmi_id)
                quirks = (unsigned long)dmi_id->driver_data;

        if (quirks & ACPI_QUIRK_SKIP_ACPI_AC_AND_BATTERY)
                return true;

        if (quirks & ACPI_QUIRK_USE_ACPI_AC_AND_BATTERY)
                return false;

        for (i = 0; i < ARRAY_SIZE(acpi_skip_ac_and_battery_pmic_ids); i++) {
                if (acpi_dev_present(acpi_skip_ac_and_battery_pmic_ids[i].hid, "1",
                                     acpi_skip_ac_and_battery_pmic_ids[i].hrv)) {
                        pr_info_once("found native %s PMIC, skipping ACPI AC and battery devices\n",
                                     acpi_skip_ac_and_battery_pmic_ids[i].hid);
                        return true;
                }
        }

        return false;
}
EXPORT_SYMBOL_GPL(acpi_quirk_skip_acpi_ac_and_battery);

/* This section provides a workaround for a specific x86 system
 * which requires disabling of mwait to work correctly.
 */
static int __init acpi_proc_quirk_set_no_mwait(const struct dmi_system_id *id)
{
        pr_notice("%s detected - disabling mwait for CPU C-states\n",
                  id->ident);
        boot_option_idle_override = IDLE_NOMWAIT;
        return 0;
}

static const struct dmi_system_id acpi_proc_quirk_mwait_dmi_table[] __initconst = {
        {
                .callback = acpi_proc_quirk_set_no_mwait,
                .ident = "Extensa 5220",
                .matches =  {
                        DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
                        DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
                        DMI_MATCH(DMI_PRODUCT_VERSION, "0100"),
                        DMI_MATCH(DMI_BOARD_NAME, "Columbia"),
                },
                .driver_data = NULL,
        },
        {}
};

void __init acpi_proc_quirk_mwait_check(void)
{
        /*
         * Check whether the system is DMI table. If yes, OSPM
         * should not use mwait for CPU-states.
         */
        dmi_check_system(acpi_proc_quirk_mwait_dmi_table);
}