// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Support for rfkill on some Fujitsu-Siemens Amilo laptops.
 * Copyright 2011 Ben Hutchings.
 *
 * Based in part on the fsam7440 driver, which is:
 * Copyright 2005 Alejandro Vidal Mata & Javier Vidal Mata.
 * and on the fsaa1655g driver, which is:
 * Copyright 2006 Martin Večeřa.
 */

#include <linux/module.h>
#include <linux/dmi.h>
#include <linux/i8042.h>
#include <linux/io.h>
#include <linux/moduleparam.h>
#include <linux/platform_device.h>
#include <linux/rfkill.h>

/*
 * These values were obtained from disassembling and debugging the
 * PM.exe program installed in the Fujitsu-Siemens AMILO A1655G
 */
#define A1655_WIFI_COMMAND      0x10C5
#define A1655_WIFI_ON           0x25
#define A1655_WIFI_OFF          0x45

static int amilo_a1655_rfkill_set_block(void *data, bool blocked)
{
        u8 param = blocked ? A1655_WIFI_OFF : A1655_WIFI_ON;
        int rc;

        i8042_lock_chip();
        rc = i8042_command(&param, A1655_WIFI_COMMAND);
        i8042_unlock_chip();
        return rc;
}

static const struct rfkill_ops amilo_a1655_rfkill_ops = {
        .set_block = amilo_a1655_rfkill_set_block
};

/*
 * These values were obtained from disassembling the PM.exe program
 * installed in the Fujitsu-Siemens AMILO M 7440
 */
#define M7440_PORT1             0x118f
#define M7440_PORT2             0x118e
#define M7440_RADIO_ON1         0x12
#define M7440_RADIO_ON2         0x80
#define M7440_RADIO_OFF1        0x10
#define M7440_RADIO_OFF2        0x00

static int amilo_m7440_rfkill_set_block(void *data, bool blocked)
{
        u8 val1 = blocked ? M7440_RADIO_OFF1 : M7440_RADIO_ON1;
        u8 val2 = blocked ? M7440_RADIO_OFF2 : M7440_RADIO_ON2;

        outb(val1, M7440_PORT1);
        outb(val2, M7440_PORT2);

        /* Check whether the state has changed correctly */
        if (inb(M7440_PORT1) != val1 || inb(M7440_PORT2) != val2)
                return -EIO;

        return 0;
}

static const struct rfkill_ops amilo_m7440_rfkill_ops = {
        .set_block = amilo_m7440_rfkill_set_block
};

static const struct dmi_system_id amilo_rfkill_id_table[] = {
        {
                .matches = {
                        DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU SIEMENS"),
                        DMI_MATCH(DMI_BOARD_NAME, "AMILO A1655"),
                },
                .driver_data = (void *)&amilo_a1655_rfkill_ops
        },
        {
                .matches = {
                        DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU SIEMENS"),
                        DMI_MATCH(DMI_BOARD_NAME, "AMILO L1310"),
                },
                .driver_data = (void *)&amilo_a1655_rfkill_ops
        },
        {
                .matches = {
                        DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU SIEMENS"),
                        DMI_MATCH(DMI_BOARD_NAME, "AMILO M7440"),
                },
                .driver_data = (void *)&amilo_m7440_rfkill_ops
        },
        {}
};

static struct platform_device *amilo_rfkill_pdev;
static struct rfkill *amilo_rfkill_dev;

static int amilo_rfkill_probe(struct platform_device *device)
{
        int rc;
        const struct dmi_system_id *system_id =
                dmi_first_match(amilo_rfkill_id_table);

        if (!system_id)
                return -ENXIO;

        amilo_rfkill_dev = rfkill_alloc(KBUILD_MODNAME, &device->dev,
                                        RFKILL_TYPE_WLAN,
                                        system_id->driver_data, NULL);
        if (!amilo_rfkill_dev)
                return -ENOMEM;

        rc = rfkill_register(amilo_rfkill_dev);
        if (rc)
                goto fail;

        return 0;

fail:
        rfkill_destroy(amilo_rfkill_dev);
        return rc;
}

static void amilo_rfkill_remove(struct platform_device *device)
{
        rfkill_unregister(amilo_rfkill_dev);
        rfkill_destroy(amilo_rfkill_dev);
}

static struct platform_driver amilo_rfkill_driver = {
        .driver = {
                .name = KBUILD_MODNAME,
        },
        .probe = amilo_rfkill_probe,
        .remove = amilo_rfkill_remove,
};

static int __init amilo_rfkill_init(void)
{
        int rc;

        if (dmi_first_match(amilo_rfkill_id_table) == NULL)
                return -ENODEV;

        rc = platform_driver_register(&amilo_rfkill_driver);
        if (rc)
                return rc;

        amilo_rfkill_pdev = platform_device_register_simple(KBUILD_MODNAME,
                                                            PLATFORM_DEVID_NONE,
                                                            NULL, 0);
        if (IS_ERR(amilo_rfkill_pdev)) {
                rc = PTR_ERR(amilo_rfkill_pdev);
                goto fail;
        }

        return 0;

fail:
        platform_driver_unregister(&amilo_rfkill_driver);
        return rc;
}

static void __exit amilo_rfkill_exit(void)
{
        platform_device_unregister(amilo_rfkill_pdev);
        platform_driver_unregister(&amilo_rfkill_driver);
}

MODULE_AUTHOR("Ben Hutchings <ben@decadent.org.uk>");
MODULE_DESCRIPTION("Fujitsu-Siemens Amilo rfkill support");
MODULE_LICENSE("GPL");
MODULE_DEVICE_TABLE(dmi, amilo_rfkill_id_table);

module_init(amilo_rfkill_init);
module_exit(amilo_rfkill_exit);