// 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 */