// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * container.c  - ACPI Generic Container Driver
 *
 * Copyright (C) 2004 Anil S Keshavamurthy (anil.s.keshavamurthy@intel.com)
 * Copyright (C) 2004 Keiichiro Tokunaga (tokunaga.keiich@jp.fujitsu.com)
 * Copyright (C) 2004 Motoyuki Ito (motoyuki@soft.fujitsu.com)
 * Copyright (C) 2004 FUJITSU LIMITED
 * Copyright (C) 2004, 2013 Intel Corp.
 * Author: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
 */
#include <linux/acpi.h>
#include <linux/container.h>

#include "internal.h"

static const struct acpi_device_id container_device_ids[] = {
        {"ACPI0004", 0},
        {"PNP0A05", 0},
        {"PNP0A06", 0},
        {"", 0},
};

#ifdef CONFIG_ACPI_CONTAINER

static int check_offline(struct acpi_device *adev, void *not_used)
{
        if (acpi_scan_is_offline(adev, false))
                return 0;

        return -EBUSY;
}

static int acpi_container_offline(struct container_dev *cdev)
{
        /* Check all of the dependent devices' physical companions. */
        return acpi_dev_for_each_child(ACPI_COMPANION(&cdev->dev), check_offline, NULL);
}

static void acpi_container_release(struct device *dev)
{
        kfree(to_container_dev(dev));
}

static int container_device_attach(struct acpi_device *adev,
                                   const struct acpi_device_id *not_used)
{
        struct container_dev *cdev;
        struct device *dev;
        int ret;

        if (adev->flags.is_dock_station)
                return 0;

        cdev = kzalloc_obj(*cdev);
        if (!cdev)
                return -ENOMEM;

        cdev->offline = acpi_container_offline;
        dev = &cdev->dev;
        dev->bus = &container_subsys;
        dev_set_name(dev, "%s", dev_name(&adev->dev));
        ACPI_COMPANION_SET(dev, adev);
        dev->release = acpi_container_release;
        ret = device_register(dev);
        if (ret) {
                put_device(dev);
                return ret;
        }
        adev->driver_data = dev;
        return 1;
}

static void container_device_detach(struct acpi_device *adev)
{
        struct device *dev = acpi_driver_data(adev);

        adev->driver_data = NULL;
        if (dev)
                device_unregister(dev);
}

static void container_device_online(struct acpi_device *adev)
{
        struct device *dev = acpi_driver_data(adev);

        kobject_uevent(&dev->kobj, KOBJ_ONLINE);
}

static struct acpi_scan_handler container_handler = {
        .ids = container_device_ids,
        .attach = container_device_attach,
        .detach = container_device_detach,
        .hotplug = {
                .enabled = true,
                .demand_offline = true,
                .notify_online = container_device_online,
        },
};

void __init acpi_container_init(void)
{
        acpi_scan_add_handler(&container_handler);
}

#else

static struct acpi_scan_handler container_handler = {
        .ids = container_device_ids,
};

void __init acpi_container_init(void)
{
        acpi_scan_add_handler_with_hotplug(&container_handler, "container");
}

#endif /* CONFIG_ACPI_CONTAINER */