// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Support for rfkill through the OLPC XO-1 laptop embedded controller
 *
 * Copyright (C) 2010 One Laptop per Child
 */

#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 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 void xo1_rfkill_remove(struct platform_device *pdev)
{
        struct rfkill *rfk = platform_get_drvdata(pdev);
        rfkill_unregister(rfk);
        rfkill_destroy(rfk);
}

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

module_platform_driver(xo1_rfkill_driver);

MODULE_AUTHOR("Daniel Drake <dsd@laptop.org>");
MODULE_DESCRIPTION("OLPC XO-1 software RF kill switch");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:xo1-rfkill");