// SPDX-License-Identifier: GPL-2.0-only
/*
 * Kontron PLD MFD core driver
 *
 * Copyright (c) 2010-2013 Kontron Europe GmbH
 * Author: Michael Brunner <michael.brunner@kontron.com>
 */

#include <linux/err.h>
#include <linux/platform_device.h>
#include <linux/mfd/core.h>
#include <linux/mfd/kempld.h>
#include <linux/mod_devicetable.h>
#include <linux/module.h>
#include <linux/property.h>
#include <linux/dmi.h>
#include <linux/io.h>
#include <linux/delay.h>
#include <linux/sysfs.h>

#define MAX_ID_LEN 4
static char force_device_id[MAX_ID_LEN + 1] = "";
module_param_string(force_device_id, force_device_id,
                    sizeof(force_device_id), 0);
MODULE_PARM_DESC(force_device_id, "Override detected product");

/*
 * Get hardware mutex to block firmware from accessing the pld.
 * It is possible for the firmware may hold the mutex for an extended length of
 * time. This function will block until access has been granted.
 */
static void kempld_get_hardware_mutex(struct kempld_device_data *pld)
{
        /* The mutex bit will read 1 until access has been granted */
        while (ioread8(pld->io_index) & KEMPLD_MUTEX_KEY)
                usleep_range(1000, 3000);
}

static void kempld_release_hardware_mutex(struct kempld_device_data *pld)
{
        /* The harware mutex is released when 1 is written to the mutex bit. */
        iowrite8(KEMPLD_MUTEX_KEY, pld->io_index);
}

static int kempld_get_info_generic(struct kempld_device_data *pld)
{
        u16 version;
        u8 spec;

        kempld_get_mutex(pld);

        version = kempld_read16(pld, KEMPLD_VERSION);
        spec = kempld_read8(pld, KEMPLD_SPEC);
        pld->info.buildnr = kempld_read16(pld, KEMPLD_BUILDNR);

        pld->info.minor = KEMPLD_VERSION_GET_MINOR(version);
        pld->info.major = KEMPLD_VERSION_GET_MAJOR(version);
        pld->info.number = KEMPLD_VERSION_GET_NUMBER(version);
        pld->info.type = KEMPLD_VERSION_GET_TYPE(version);

        if (spec == 0xff) {
                pld->info.spec_minor = 0;
                pld->info.spec_major = 1;
        } else {
                pld->info.spec_minor = KEMPLD_SPEC_GET_MINOR(spec);
                pld->info.spec_major = KEMPLD_SPEC_GET_MAJOR(spec);
        }

        if (pld->info.spec_major > 0)
                pld->feature_mask = kempld_read16(pld, KEMPLD_FEATURE);
        else
                pld->feature_mask = 0;

        kempld_release_mutex(pld);

        return 0;
}

enum kempld_cells {
        KEMPLD_I2C = 0,
        KEMPLD_WDT,
        KEMPLD_GPIO,
        KEMPLD_UART,
};

static const char *kempld_dev_names[] = {
        [KEMPLD_I2C] = "kempld-i2c",
        [KEMPLD_WDT] = "kempld-wdt",
        [KEMPLD_GPIO] = "kempld-gpio",
        [KEMPLD_UART] = "kempld-uart",
};

#define KEMPLD_MAX_DEVS ARRAY_SIZE(kempld_dev_names)

static int kempld_register_cells_generic(struct kempld_device_data *pld)
{
        struct mfd_cell devs[KEMPLD_MAX_DEVS] = {};
        int i = 0;

        if (pld->feature_mask & KEMPLD_FEATURE_BIT_I2C)
                devs[i++].name = kempld_dev_names[KEMPLD_I2C];

        if (pld->feature_mask & KEMPLD_FEATURE_BIT_WATCHDOG)
                devs[i++].name = kempld_dev_names[KEMPLD_WDT];

        if (pld->feature_mask & KEMPLD_FEATURE_BIT_GPIO)
                devs[i++].name = kempld_dev_names[KEMPLD_GPIO];

        if (pld->feature_mask & KEMPLD_FEATURE_MASK_UART)
                devs[i++].name = kempld_dev_names[KEMPLD_UART];

        return mfd_add_devices(pld->dev, PLATFORM_DEVID_NONE, devs, i, NULL, 0, NULL);
}

static struct resource kempld_ioresource = {
        .start  = KEMPLD_IOINDEX,
        .end    = KEMPLD_IODATA,
        .flags  = IORESOURCE_IO,
};

static const struct kempld_platform_data kempld_platform_data_generic = {
        .pld_clock              = KEMPLD_CLK,
        .ioresource             = &kempld_ioresource,
        .get_hardware_mutex     = kempld_get_hardware_mutex,
        .release_hardware_mutex = kempld_release_hardware_mutex,
        .get_info               = kempld_get_info_generic,
        .register_cells         = kempld_register_cells_generic,
};

static struct platform_device *kempld_pdev;

static int kempld_create_platform_device(const struct kempld_platform_data *pdata)
{
        const struct platform_device_info pdevinfo = {
                .name = "kempld",
                .id = PLATFORM_DEVID_NONE,
                .res = pdata->ioresource,
                .num_res = 1,
                .data = pdata,
                .size_data = sizeof(*pdata),
        };

        kempld_pdev = platform_device_register_full(&pdevinfo);

        return PTR_ERR_OR_ZERO(kempld_pdev);
}

/**
 * kempld_read8 - read 8 bit register
 * @pld: kempld_device_data structure describing the PLD
 * @index: register index on the chip
 *
 * kempld_get_mutex must be called prior to calling this function.
 */
u8 kempld_read8(struct kempld_device_data *pld, u8 index)
{
        iowrite8(index, pld->io_index);
        return ioread8(pld->io_data);
}
EXPORT_SYMBOL_GPL(kempld_read8);

/**
 * kempld_write8 - write 8 bit register
 * @pld: kempld_device_data structure describing the PLD
 * @index: register index on the chip
 * @data: new register value
 *
 * kempld_get_mutex must be called prior to calling this function.
 */
void kempld_write8(struct kempld_device_data *pld, u8 index, u8 data)
{
        iowrite8(index, pld->io_index);
        iowrite8(data, pld->io_data);
}
EXPORT_SYMBOL_GPL(kempld_write8);

/**
 * kempld_read16 - read 16 bit register
 * @pld: kempld_device_data structure describing the PLD
 * @index: register index on the chip
 *
 * kempld_get_mutex must be called prior to calling this function.
 */
u16 kempld_read16(struct kempld_device_data *pld, u8 index)
{
        return kempld_read8(pld, index) | kempld_read8(pld, index + 1) << 8;
}
EXPORT_SYMBOL_GPL(kempld_read16);

/**
 * kempld_write16 - write 16 bit register
 * @pld: kempld_device_data structure describing the PLD
 * @index: register index on the chip
 * @data: new register value
 *
 * kempld_get_mutex must be called prior to calling this function.
 */
void kempld_write16(struct kempld_device_data *pld, u8 index, u16 data)
{
        kempld_write8(pld, index, (u8)data);
        kempld_write8(pld, index + 1, (u8)(data >> 8));
}
EXPORT_SYMBOL_GPL(kempld_write16);

/**
 * kempld_read32 - read 32 bit register
 * @pld: kempld_device_data structure describing the PLD
 * @index: register index on the chip
 *
 * kempld_get_mutex must be called prior to calling this function.
 */
u32 kempld_read32(struct kempld_device_data *pld, u8 index)
{
        return kempld_read16(pld, index) | kempld_read16(pld, index + 2) << 16;
}
EXPORT_SYMBOL_GPL(kempld_read32);

/**
 * kempld_write32 - write 32 bit register
 * @pld: kempld_device_data structure describing the PLD
 * @index: register index on the chip
 * @data: new register value
 *
 * kempld_get_mutex must be called prior to calling this function.
 */
void kempld_write32(struct kempld_device_data *pld, u8 index, u32 data)
{
        kempld_write16(pld, index, (u16)data);
        kempld_write16(pld, index + 2, (u16)(data >> 16));
}
EXPORT_SYMBOL_GPL(kempld_write32);

/**
 * kempld_get_mutex - acquire PLD mutex
 * @pld: kempld_device_data structure describing the PLD
 */
void kempld_get_mutex(struct kempld_device_data *pld)
{
        const struct kempld_platform_data *pdata = dev_get_platdata(pld->dev);

        mutex_lock(&pld->lock);
        pdata->get_hardware_mutex(pld);
}
EXPORT_SYMBOL_GPL(kempld_get_mutex);

/**
 * kempld_release_mutex - release PLD mutex
 * @pld: kempld_device_data structure describing the PLD
 */
void kempld_release_mutex(struct kempld_device_data *pld)
{
        const struct kempld_platform_data *pdata = dev_get_platdata(pld->dev);

        pdata->release_hardware_mutex(pld);
        mutex_unlock(&pld->lock);
}
EXPORT_SYMBOL_GPL(kempld_release_mutex);

/**
 * kempld_get_info - update device specific information
 * @pld: kempld_device_data structure describing the PLD
 *
 * This function calls the configured board specific kempld_get_info_XXXX
 * function which is responsible for gathering information about the specific
 * hardware. The information is then stored within the pld structure.
 */
static int kempld_get_info(struct kempld_device_data *pld)
{
        int ret;
        const struct kempld_platform_data *pdata = dev_get_platdata(pld->dev);
        char major, minor;

        ret = pdata->get_info(pld);
        if (ret)
                return ret;

        /* The Kontron PLD firmware version string has the following format:
         * Pwxy.zzzz
         *   P:    Fixed
         *   w:    PLD number    - 1 hex digit
         *   x:    Major version - 1 alphanumerical digit (0-9A-V)
         *   y:    Minor version - 1 alphanumerical digit (0-9A-V)
         *   zzzz: Build number  - 4 zero padded hex digits */

        if (pld->info.major < 10)
                major = pld->info.major + '0';
        else
                major = (pld->info.major - 10) + 'A';
        if (pld->info.minor < 10)
                minor = pld->info.minor + '0';
        else
                minor = (pld->info.minor - 10) + 'A';

        scnprintf(pld->info.version, sizeof(pld->info.version), "P%X%c%c.%04X",
                  pld->info.number, major, minor, pld->info.buildnr);

        return 0;
}

/*
 * kempld_register_cells - register cell drivers
 *
 * This function registers cell drivers for the detected hardware by calling
 * the configured kempld_register_cells_XXXX function which is responsible
 * to detect and register the needed cell drivers.
 */
static int kempld_register_cells(struct kempld_device_data *pld)
{
        const struct kempld_platform_data *pdata = dev_get_platdata(pld->dev);

        return pdata->register_cells(pld);
}

static const char *kempld_get_type_string(struct kempld_device_data *pld)
{
        const char *version_type;

        switch (pld->info.type) {
        case 0:
                version_type = "release";
                break;
        case 1:
                version_type = "debug";
                break;
        case 2:
                version_type = "custom";
                break;
        default:
                version_type = "unspecified";
                break;
        }

        return version_type;
}

static ssize_t pld_version_show(struct device *dev,
                                struct device_attribute *attr, char *buf)
{
        struct kempld_device_data *pld = dev_get_drvdata(dev);

        return sysfs_emit(buf, "%s\n", pld->info.version);
}

static ssize_t pld_specification_show(struct device *dev,
                                      struct device_attribute *attr, char *buf)
{
        struct kempld_device_data *pld = dev_get_drvdata(dev);

        return sysfs_emit(buf, "%d.%d\n", pld->info.spec_major, pld->info.spec_minor);
}

static ssize_t pld_type_show(struct device *dev,
                             struct device_attribute *attr, char *buf)
{
        struct kempld_device_data *pld = dev_get_drvdata(dev);

        return sysfs_emit(buf, "%s\n", kempld_get_type_string(pld));
}

static DEVICE_ATTR_RO(pld_version);
static DEVICE_ATTR_RO(pld_specification);
static DEVICE_ATTR_RO(pld_type);

static struct attribute *pld_attrs[] = {
        &dev_attr_pld_version.attr,
        &dev_attr_pld_specification.attr,
        &dev_attr_pld_type.attr,
        NULL
};
ATTRIBUTE_GROUPS(pld);

static int kempld_detect_device(struct kempld_device_data *pld)
{
        u8 index_reg;
        int ret;

        mutex_lock(&pld->lock);

        /* Check for empty IO space */
        index_reg = ioread8(pld->io_index);
        if (index_reg == 0xff && ioread8(pld->io_data) == 0xff) {
                mutex_unlock(&pld->lock);
                return -ENODEV;
        }

        /* Release hardware mutex if acquired */
        if (!(index_reg & KEMPLD_MUTEX_KEY)) {
                iowrite8(KEMPLD_MUTEX_KEY, pld->io_index);
                /* PXT and COMe-cPC2 boards may require a second release */
                iowrite8(KEMPLD_MUTEX_KEY, pld->io_index);
        }

        mutex_unlock(&pld->lock);

        ret = kempld_get_info(pld);
        if (ret)
                return ret;

        dev_info(pld->dev, "Found Kontron PLD - %s (%s), spec %d.%d\n",
                 pld->info.version, kempld_get_type_string(pld),
                 pld->info.spec_major, pld->info.spec_minor);

        return kempld_register_cells(pld);
}

static int kempld_probe(struct platform_device *pdev)
{
        const struct kempld_platform_data *pdata;
        struct device *dev = &pdev->dev;
        struct kempld_device_data *pld;
        struct resource *ioport;
        int ret;

        if (IS_ERR_OR_NULL(kempld_pdev)) {
                /*
                 * No kempld_pdev device has been registered in kempld_init,
                 * so we seem to be probing an ACPI platform device.
                 */
                pdata = device_get_match_data(dev);
                if (!pdata)
                        return -ENODEV;

                ret = platform_device_add_data(pdev, pdata, sizeof(*pdata));
                if (ret)
                        return ret;
        } else if (kempld_pdev == pdev) {
                pdata = dev_get_platdata(dev);
        } else {
                /*
                 * The platform device we are probing is not the one we
                 * registered in kempld_init using the DMI table, so this one
                 * comes from ACPI.
                 * As we can only probe one - abort here and use the DMI
                 * based one instead.
                 */
                dev_notice(dev, "platform device exists - not using ACPI\n");
                return -ENODEV;
        }

        pld = devm_kzalloc(dev, sizeof(*pld), GFP_KERNEL);
        if (!pld)
                return -ENOMEM;

        ioport = platform_get_resource(pdev, IORESOURCE_IO, 0);
        if (!ioport)
                return -EINVAL;

        pld->io_base = devm_ioport_map(dev, ioport->start,
                                        resource_size(ioport));
        if (!pld->io_base)
                return -ENOMEM;

        pld->io_index = pld->io_base;
        pld->io_data = pld->io_base + 1;
        pld->pld_clock = pdata->pld_clock;
        pld->dev = dev;

        mutex_init(&pld->lock);
        platform_set_drvdata(pdev, pld);

        return kempld_detect_device(pld);
}

static void kempld_remove(struct platform_device *pdev)
{
        struct kempld_device_data *pld = platform_get_drvdata(pdev);
        const struct kempld_platform_data *pdata = dev_get_platdata(pld->dev);

        mfd_remove_devices(&pdev->dev);
        pdata->release_hardware_mutex(pld);
}

static const struct acpi_device_id kempld_acpi_table[] = {
        { "KEM0000", (kernel_ulong_t)&kempld_platform_data_generic },
        { "KEM0001", (kernel_ulong_t)&kempld_platform_data_generic },
        {}
};
MODULE_DEVICE_TABLE(acpi, kempld_acpi_table);

static struct platform_driver kempld_driver = {
        .driver         = {
                .name   = "kempld",
                .acpi_match_table = kempld_acpi_table,
                .dev_groups       = pld_groups,
        },
        .probe          = kempld_probe,
        .remove         = kempld_remove,
};

static const struct dmi_system_id kempld_dmi_table[] __initconst = {
        {
                .ident = "BBD6",
                .matches = {
                        DMI_MATCH(DMI_BOARD_VENDOR, "Kontron"),
                        DMI_MATCH(DMI_BOARD_NAME, "COMe-bBD"),
                },
        }, {
                .ident = "BBL6",
                .matches = {
                        DMI_MATCH(DMI_BOARD_VENDOR, "Kontron"),
                        DMI_MATCH(DMI_BOARD_NAME, "COMe-bBL6"),
                },
        }, {
                .ident = "BDV7",
                .matches = {
                        DMI_MATCH(DMI_BOARD_VENDOR, "Kontron"),
                        DMI_MATCH(DMI_BOARD_NAME, "COMe-bDV7"),
                },
        }, {
                .ident = "BHL6",
                .matches = {
                        DMI_MATCH(DMI_BOARD_VENDOR, "Kontron"),
                        DMI_MATCH(DMI_BOARD_NAME, "COMe-bHL6"),
                },
        }, {
                .ident = "BKL6",
                .matches = {
                        DMI_MATCH(DMI_BOARD_VENDOR, "Kontron"),
                        DMI_MATCH(DMI_BOARD_NAME, "COMe-bKL6"),
                },
        }, {
                .ident = "BSL6",
                .matches = {
                        DMI_MATCH(DMI_BOARD_VENDOR, "Kontron"),
                        DMI_MATCH(DMI_BOARD_NAME, "COMe-bSL6"),
                },
        }, {
                .ident = "CAL6",
                .matches = {
                        DMI_MATCH(DMI_BOARD_VENDOR, "Kontron"),
                        DMI_MATCH(DMI_BOARD_NAME, "COMe-cAL"),
                },
        }, {
                .ident = "CBL6",
                .matches = {
                        DMI_MATCH(DMI_BOARD_VENDOR, "Kontron"),
                        DMI_MATCH(DMI_BOARD_NAME, "COMe-cBL6"),
                },
        }, {
                .ident = "CBW6",
                .matches = {
                        DMI_MATCH(DMI_BOARD_VENDOR, "Kontron"),
                        DMI_MATCH(DMI_BOARD_NAME, "COMe-cBW6"),
                },
        }, {
                .ident = "CCR2",
                .matches = {
                        DMI_MATCH(DMI_BOARD_VENDOR, "Kontron"),
                        DMI_MATCH(DMI_BOARD_NAME, "COMe-bIP2"),
                },
        }, {
                .ident = "CCR6",
                .matches = {
                        DMI_MATCH(DMI_BOARD_VENDOR, "Kontron"),
                        DMI_MATCH(DMI_BOARD_NAME, "COMe-bIP6"),
                },
        }, {
                .ident = "CDV7",
                .matches = {
                        DMI_MATCH(DMI_BOARD_VENDOR, "Kontron"),
                        DMI_MATCH(DMI_BOARD_NAME, "COMe-cDV7"),
                },
        }, {
                .ident = "CHL6",
                .matches = {
                        DMI_MATCH(DMI_BOARD_VENDOR, "Kontron"),
                        DMI_MATCH(DMI_BOARD_NAME, "COMe-cHL6"),
                },
        }, {
                .ident = "CHR2",
                .matches = {
                        DMI_MATCH(DMI_BOARD_VENDOR, "Kontron"),
                        DMI_MATCH(DMI_BOARD_NAME, "ETXexpress-SC T2"),
                },
        }, {
                .ident = "CHR2",
                .matches = {
                        DMI_MATCH(DMI_BOARD_VENDOR, "Kontron"),
                        DMI_MATCH(DMI_BOARD_NAME, "ETXe-SC T2"),
                },
        }, {
                .ident = "CHR2",
                .matches = {
                        DMI_MATCH(DMI_BOARD_VENDOR, "Kontron"),
                        DMI_MATCH(DMI_BOARD_NAME, "COMe-bSC2"),
                },
        }, {
                .ident = "CHR6",
                .matches = {
                        DMI_MATCH(DMI_BOARD_VENDOR, "Kontron"),
                        DMI_MATCH(DMI_BOARD_NAME, "ETXexpress-SC T6"),
                },
        }, {
                .ident = "CHR6",
                .matches = {
                        DMI_MATCH(DMI_BOARD_VENDOR, "Kontron"),
                        DMI_MATCH(DMI_BOARD_NAME, "ETXe-SC T6"),
                },
        }, {
                .ident = "CHR6",
                .matches = {
                        DMI_MATCH(DMI_BOARD_VENDOR, "Kontron"),
                        DMI_MATCH(DMI_BOARD_NAME, "COMe-bSC6"),
                },
        }, {
                .ident = "CKL6",
                .matches = {
                        DMI_MATCH(DMI_BOARD_VENDOR, "Kontron"),
                        DMI_MATCH(DMI_BOARD_NAME, "COMe-cKL6"),
                },
        }, {
                .ident = "CNTG",
                .matches = {
                        DMI_MATCH(DMI_BOARD_VENDOR, "Kontron"),
                        DMI_MATCH(DMI_BOARD_NAME, "ETXexpress-PC"),
                },
        }, {
                .ident = "CNTG",
                .matches = {
                        DMI_MATCH(DMI_BOARD_VENDOR, "Kontron"),
                        DMI_MATCH(DMI_BOARD_NAME, "COMe-bPC2"),
                },
        }, {
                .ident = "CNTX",
                .matches = {
                        DMI_MATCH(DMI_BOARD_VENDOR, "Kontron"),
                        DMI_MATCH(DMI_BOARD_NAME, "PXT"),
                },
        }, {
                .ident = "CSL6",
                .matches = {
                        DMI_MATCH(DMI_BOARD_VENDOR, "Kontron"),
                        DMI_MATCH(DMI_BOARD_NAME, "COMe-cSL6"),
                },
        }, {
                .ident = "CVV6",
                .matches = {
                        DMI_MATCH(DMI_BOARD_VENDOR, "Kontron"),
                        DMI_MATCH(DMI_BOARD_NAME, "COMe-cBT"),
                },
        }, {
                .ident = "FRI2",
                .matches = {
                        DMI_MATCH(DMI_BOARD_VENDOR, "Kontron"),
                        DMI_MATCH(DMI_BIOS_VERSION, "FRI2"),
                },
        }, {
                .ident = "FRI2",
                .matches = {
                        DMI_MATCH(DMI_PRODUCT_NAME, "Fish River Island II"),
                },
        }, {
                .ident = "A203",
                .matches = {
                        DMI_MATCH(DMI_BOARD_VENDOR, "Kontron"),
                        DMI_MATCH(DMI_BOARD_NAME, "KBox A-203"),
                },
        }, {
                .ident = "M4A1",
                .matches = {
                        DMI_MATCH(DMI_BOARD_VENDOR, "Kontron"),
                        DMI_MATCH(DMI_BOARD_NAME, "COMe-m4AL"),
                },
        }, {
                .ident = "MAL1",
                .matches = {
                        DMI_MATCH(DMI_BOARD_VENDOR, "Kontron"),
                        DMI_MATCH(DMI_BOARD_NAME, "COMe-mAL10"),
                },
        }, {
                .ident = "MAPL",
                .matches = {
                        DMI_MATCH(DMI_BOARD_VENDOR, "Kontron"),
                        DMI_MATCH(DMI_BOARD_NAME, "mITX-APL"),
                },
        }, {
                .ident = "MBR1",
                .matches = {
                        DMI_MATCH(DMI_BOARD_VENDOR, "Kontron"),
                        DMI_MATCH(DMI_BOARD_NAME, "ETX-OH"),
                },
        }, {
                .ident = "MVV1",
                .matches = {
                        DMI_MATCH(DMI_BOARD_VENDOR, "Kontron"),
                        DMI_MATCH(DMI_BOARD_NAME, "COMe-mBT"),
                },
        }, {
                .ident = "NTC1",
                .matches = {
                        DMI_MATCH(DMI_BOARD_VENDOR, "Kontron"),
                        DMI_MATCH(DMI_BOARD_NAME, "nanoETXexpress-TT"),
                },
        }, {
                .ident = "NTC1",
                .matches = {
                        DMI_MATCH(DMI_BOARD_VENDOR, "Kontron"),
                        DMI_MATCH(DMI_BOARD_NAME, "nETXe-TT"),
                },
        }, {
                .ident = "NTC1",
                .matches = {
                        DMI_MATCH(DMI_BOARD_VENDOR, "Kontron"),
                        DMI_MATCH(DMI_BOARD_NAME, "COMe-mTT"),
                },
        }, {
                .ident = "NUP1",
                .matches = {
                        DMI_MATCH(DMI_BOARD_VENDOR, "Kontron"),
                        DMI_MATCH(DMI_BOARD_NAME, "COMe-mCT"),
                },
        }, {
                .ident = "PAPL",
                .matches = {
                        DMI_MATCH(DMI_BOARD_VENDOR, "Kontron"),
                        DMI_MATCH(DMI_BOARD_NAME, "pITX-APL"),
                },
        }, {
                .ident = "SXAL",
                .matches = {
                        DMI_MATCH(DMI_BOARD_VENDOR, "Kontron"),
                        DMI_MATCH(DMI_BOARD_NAME, "SMARC-sXAL"),
                },
        }, {
                .ident = "SXAL4",
                .matches = {
                        DMI_MATCH(DMI_BOARD_VENDOR, "Kontron"),
                        DMI_MATCH(DMI_BOARD_NAME, "SMARC-sXA4"),
                },
        }, {
                .ident = "UNP1",
                .matches = {
                        DMI_MATCH(DMI_BOARD_VENDOR, "Kontron"),
                        DMI_MATCH(DMI_BOARD_NAME, "microETXexpress-DC"),
                },
        }, {
                .ident = "UNP1",
                .matches = {
                        DMI_MATCH(DMI_BOARD_VENDOR, "Kontron"),
                        DMI_MATCH(DMI_BOARD_NAME, "COMe-cDC2"),
                },
        }, {
                .ident = "UNTG",
                .matches = {
                        DMI_MATCH(DMI_BOARD_VENDOR, "Kontron"),
                        DMI_MATCH(DMI_BOARD_NAME, "microETXexpress-PC"),
                },
        }, {
                .ident = "UNTG",
                .matches = {
                        DMI_MATCH(DMI_BOARD_VENDOR, "Kontron"),
                        DMI_MATCH(DMI_BOARD_NAME, "COMe-cPC2"),
                },
        }, {
                .ident = "UUP6",
                .matches = {
                        DMI_MATCH(DMI_BOARD_VENDOR, "Kontron"),
                        DMI_MATCH(DMI_BOARD_NAME, "COMe-cCT6"),
                },
        }, {
                .ident = "UTH6",
                .matches = {
                        DMI_MATCH(DMI_BOARD_VENDOR, "Kontron"),
                        DMI_MATCH(DMI_BOARD_NAME, "COMe-cTH6"),
                },
        }, {
                .ident = "Q7AL",
                .matches = {
                        DMI_MATCH(DMI_BOARD_VENDOR, "Kontron"),
                        DMI_MATCH(DMI_BOARD_NAME, "Qseven-Q7AL"),
                },
        },
        {}
};
MODULE_DEVICE_TABLE(dmi, kempld_dmi_table);

static int __init kempld_init(void)
{
        const struct dmi_system_id *id;

        /*
         * This custom DMI iteration allows the driver to be initialized in three ways:
         * - When a forced_device_id string matches any ident in the kempld_dmi_table,
         *   regardless of whether the DMI device is present in the system dmi table.
         * - When a matching entry is present in the DMI system tabe.
         * - Through alternative mechanisms like ACPI.
         */
        if (force_device_id[0]) {
                for (id = kempld_dmi_table; id->matches[0].slot != DMI_NONE; id++)
                        if (strstr(id->ident, force_device_id))
                                if (!kempld_create_platform_device(&kempld_platform_data_generic))
                                        break;
                if (id->matches[0].slot == DMI_NONE)
                        return -ENODEV;
        } else {
                for (id = dmi_first_match(kempld_dmi_table); id; id = dmi_first_match(id+1))
                        if (kempld_create_platform_device(&kempld_platform_data_generic))
                                break;
        }
        return platform_driver_register(&kempld_driver);
}

static void __exit kempld_exit(void)
{
        platform_device_unregister(kempld_pdev);
        platform_driver_unregister(&kempld_driver);
}

module_init(kempld_init);
module_exit(kempld_exit);

MODULE_DESCRIPTION("KEM PLD Core Driver");
MODULE_AUTHOR("Michael Brunner <michael.brunner@kontron.com>");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:kempld-core");