amilo-rfkill.c

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/*
 * 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.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 */

#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 __devinitconst 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 M7440"),
        },
        .driver_data = (void *)&amilo_m7440_rfkill_ops
    },
    {}
};

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

static int __devinit 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 int amilo_rfkill_remove(struct platform_device *device)
{
    rfkill_unregister(amilo_rfkill_dev);
    rfkill_destroy(amilo_rfkill_dev);
    return 0;
}

static struct platform_driver amilo_rfkill_driver = {
    .driver = {
        .name   = KBUILD_MODNAME,
        .owner  = THIS_MODULE,
    },
    .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, -1,
                                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 <[email protected]>");
MODULE_LICENSE("GPL");
MODULE_DEVICE_TABLE(dmi, amilo_rfkill_id_table);

module_init(amilo_rfkill_init);
module_exit(amilo_rfkill_exit);