// SPDX-License-Identifier: GPL-2.0-only
/*
 * soundbus
 *
 * Copyright 2006 Johannes Berg <johannes@sipsolutions.net>
 */

#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_platform.h>
#include "soundbus.h"

MODULE_AUTHOR("Johannes Berg <johannes@sipsolutions.net>");
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Apple Soundbus");

struct soundbus_dev *soundbus_dev_get(struct soundbus_dev *dev)
{
        struct device *tmp;

        if (!dev)
                return NULL;
        tmp = get_device(&dev->ofdev.dev);
        if (tmp)
                return to_soundbus_device(tmp);
        else
                return NULL;
}
EXPORT_SYMBOL_GPL(soundbus_dev_get);

void soundbus_dev_put(struct soundbus_dev *dev)
{
        if (dev)
                put_device(&dev->ofdev.dev);
}
EXPORT_SYMBOL_GPL(soundbus_dev_put);

static int soundbus_probe(struct device *dev)
{
        int error = -ENODEV;
        struct soundbus_driver *drv;
        struct soundbus_dev *soundbus_dev;

        drv = to_soundbus_driver(dev->driver);
        soundbus_dev = to_soundbus_device(dev);

        if (!drv->probe)
                return error;

        soundbus_dev_get(soundbus_dev);

        error = drv->probe(soundbus_dev);
        if (error)
                soundbus_dev_put(soundbus_dev);

        return error;
}


static int soundbus_uevent(const struct device *dev, struct kobj_uevent_env *env)
{
        const struct soundbus_dev * soundbus_dev;
        const struct platform_device * of;
        const char *compat;
        int retval = 0;
        int cplen, seen = 0;

        if (!dev)
                return -ENODEV;

        soundbus_dev = to_soundbus_device(dev);
        if (!soundbus_dev)
                return -ENODEV;

        of = &soundbus_dev->ofdev;

        /* stuff we want to pass to /sbin/hotplug */
        retval = add_uevent_var(env, "OF_NAME=%pOFn", of->dev.of_node);
        if (retval)
                return retval;

        retval = add_uevent_var(env, "OF_TYPE=%s", of_node_get_device_type(of->dev.of_node));
        if (retval)
                return retval;

        /* Since the compatible field can contain pretty much anything
         * it's not really legal to split it out with commas. We split it
         * up using a number of environment variables instead. */

        compat = of_get_property(of->dev.of_node, "compatible", &cplen);
        while (compat && cplen > 0) {
                int tmp = env->buflen;
                retval = add_uevent_var(env, "OF_COMPATIBLE_%d=%s", seen, compat);
                if (retval)
                        return retval;
                compat += env->buflen - tmp;
                cplen -= env->buflen - tmp;
                seen += 1;
        }

        retval = add_uevent_var(env, "OF_COMPATIBLE_N=%d", seen);
        if (retval)
                return retval;
        retval = add_uevent_var(env, "MODALIAS=%s", soundbus_dev->modalias);

        return retval;
}

static void soundbus_device_remove(struct device *dev)
{
        struct soundbus_dev * soundbus_dev = to_soundbus_device(dev);
        struct soundbus_driver * drv = to_soundbus_driver(dev->driver);

        if (dev->driver && drv->remove)
                drv->remove(soundbus_dev);
        soundbus_dev_put(soundbus_dev);
}

static void soundbus_device_shutdown(struct device *dev)
{
        struct soundbus_dev * soundbus_dev = to_soundbus_device(dev);
        struct soundbus_driver * drv = to_soundbus_driver(dev->driver);

        if (dev->driver && drv->shutdown)
                drv->shutdown(soundbus_dev);
}

/* soundbus_dev_attrs is declared in sysfs.c */
ATTRIBUTE_GROUPS(soundbus_dev);
static const struct bus_type soundbus_bus_type = {
        .name           = "aoa-soundbus",
        .probe          = soundbus_probe,
        .uevent         = soundbus_uevent,
        .remove         = soundbus_device_remove,
        .shutdown       = soundbus_device_shutdown,
        .dev_groups     = soundbus_dev_groups,
};

int soundbus_add_one(struct soundbus_dev *dev)
{
        static int devcount;

        /* sanity checks */
        if (!dev->attach_codec ||
            !dev->ofdev.dev.of_node ||
            dev->pcmname ||
            dev->pcmid != -1) {
                printk(KERN_ERR "soundbus: adding device failed sanity check!\n");
                return -EINVAL;
        }

        dev_set_name(&dev->ofdev.dev, "soundbus:%x", ++devcount);
        dev->ofdev.dev.bus = &soundbus_bus_type;
        return of_device_register(&dev->ofdev);
}
EXPORT_SYMBOL_GPL(soundbus_add_one);

void soundbus_remove_one(struct soundbus_dev *dev)
{
        of_device_unregister(&dev->ofdev);
}
EXPORT_SYMBOL_GPL(soundbus_remove_one);

int soundbus_register_driver(struct soundbus_driver *drv)
{
        /* initialize common driver fields */
        drv->driver.name = drv->name;
        drv->driver.bus = &soundbus_bus_type;

        /* register with core */
        return driver_register(&drv->driver);
}
EXPORT_SYMBOL_GPL(soundbus_register_driver);

void soundbus_unregister_driver(struct soundbus_driver *drv)
{
        driver_unregister(&drv->driver);
}
EXPORT_SYMBOL_GPL(soundbus_unregister_driver);

static int __init soundbus_init(void)
{
        return bus_register(&soundbus_bus_type);
}

static void __exit soundbus_exit(void)
{
        bus_unregister(&soundbus_bus_type);
}

subsys_initcall(soundbus_init);
module_exit(soundbus_exit);