// 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 acpi_container_offline(struct container_dev *cdev)
  {
  	struct acpi_device *adev = ACPI_COMPANION(&cdev->dev);
  	struct acpi_device *child;
  
  	/* Check all of the dependent devices' physical companions. */
  	list_for_each_entry(child, &adev->children, node)
  		if (!acpi_scan_is_offline(child, false))
  			return -EBUSY;
  
  	return 0;
  }
  
  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(sizeof(*cdev), GFP_KERNEL);
  	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 */