xo1-rfkill.c

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/*
 * Support for rfkill through the OLPC XO-1 laptop embedded controller
 *
 * Copyright (C) 2010 One Laptop per Child
 *
 * 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/platform_device.h>
#include <linux/rfkill.h>
#include <linux/olpc-ec.h>

static bool card_blocked;

static int rfkill_set_block(void *data, bool blocked)
{
    unsigned char cmd;
    int r;

    if (blocked == card_blocked)
        return 0;

    if (blocked)
        cmd = EC_WLAN_ENTER_RESET;
    else
        cmd = EC_WLAN_LEAVE_RESET;

    r = olpc_ec_cmd(cmd, NULL, 0, NULL, 0);
    if (r == 0)
        card_blocked = blocked;

    return r;
}

static const struct rfkill_ops rfkill_ops = {
    .set_block = rfkill_set_block,
};

static int __devinit xo1_rfkill_probe(struct platform_device *pdev)
{
    struct rfkill *rfk;
    int r;

    rfk = rfkill_alloc(pdev->name, &pdev->dev, RFKILL_TYPE_WLAN,
               &rfkill_ops, NULL);
    if (!rfk)
        return -ENOMEM;

    r = rfkill_register(rfk);
    if (r) {
        rfkill_destroy(rfk);
        return r;
    }

    platform_set_drvdata(pdev, rfk);
    return 0;
}

static int __devexit xo1_rfkill_remove(struct platform_device *pdev)
{
    struct rfkill *rfk = platform_get_drvdata(pdev);
    rfkill_unregister(rfk);
    rfkill_destroy(rfk);
    return 0;
}

static struct platform_driver xo1_rfkill_driver = {
    .driver = {
        .name = "xo1-rfkill",
        .owner = THIS_MODULE,
    },
    .probe      = xo1_rfkill_probe,
    .remove     = __devexit_p(xo1_rfkill_remove),
};

module_platform_driver(xo1_rfkill_driver);

MODULE_AUTHOR("Daniel Drake <[email protected]>");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:xo1-rfkill");