/*-
 * Copyright 2016 Michal Meloun <mmel@FreeBSD.org>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/module.h>
#include <sys/bus.h>

#include <dev/fdt/simplebus.h>

#include <dev/ofw/openfirm.h>
#include <dev/ofw/ofw_bus_subr.h>

struct ofw_regulator_bus_softc {
        struct simplebus_softc simplebus_sc;
};

static int
ofw_regulator_bus_probe(device_t dev)
{
        const char      *name;

        name = ofw_bus_get_name(dev);
        if (name == NULL || strcmp(name, "regulators") != 0)
                return (ENXIO);
        device_set_desc(dev, "OFW regulators bus");

        return (0);
}

static int
ofw_regulator_bus_attach(device_t dev)
{
        phandle_t node, child;

        node  = ofw_bus_get_node(dev);
        simplebus_init(dev, node);

        for (child = OF_child(node); child > 0; child = OF_peer(child)) {
                simplebus_add_device(dev, child, 0, NULL, -1, NULL);
        }

        bus_attach_children(dev);
        return (0);
}

static device_method_t ofw_regulator_bus_methods[] = {
        /* Device interface */
        DEVMETHOD(device_probe,         ofw_regulator_bus_probe),
        DEVMETHOD(device_attach,        ofw_regulator_bus_attach),

        DEVMETHOD_END
};

DEFINE_CLASS_1(ofw_regulator_bus, ofw_regulator_bus_driver,
    ofw_regulator_bus_methods, sizeof(struct ofw_regulator_bus_softc),
    simplebus_driver);
EARLY_DRIVER_MODULE(ofw_regulator_bus, simplebus, ofw_regulator_bus_driver,
    0, 0, BUS_PASS_BUS + BUS_PASS_ORDER_MIDDLE);
MODULE_VERSION(ofw_regulator_bus, 1);