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1// SPDX-License-Identifier: GPL-2.0-or-later2/*3 * container.c - ACPI Generic Container Driver4 *5 * Copyright (C) 2004 Anil S Keshavamurthy (anil.s.keshavamurthy@intel.com)6 * Copyright (C) 2004 Keiichiro Tokunaga (tokunaga.keiich@jp.fujitsu.com)7 * Copyright (C) 2004 Motoyuki Ito (motoyuki@soft.fujitsu.com)8 * Copyright (C) 2004 FUJITSU LIMITED9 * Copyright (C) 2004, 2013 Intel Corp.10 * Author: Rafael J. Wysocki <rafael.j.wysocki@intel.com>11 */12#include <linux/acpi.h>13#include <linux/container.h>14 15#include "internal.h"16 17static const struct acpi_device_id container_device_ids[] = {18 {"ACPI0004", 0},19 {"PNP0A05", 0},20 {"PNP0A06", 0},21 {"", 0},22};23 24#ifdef CONFIG_ACPI_CONTAINER25 26static int check_offline(struct acpi_device *adev, void *not_used)27{28 if (acpi_scan_is_offline(adev, false))29 return 0;30 31 return -EBUSY;32}33 34static int acpi_container_offline(struct container_dev *cdev)35{36 /* Check all of the dependent devices' physical companions. */37 return acpi_dev_for_each_child(ACPI_COMPANION(&cdev->dev), check_offline, NULL);38}39 40static void acpi_container_release(struct device *dev)41{42 kfree(to_container_dev(dev));43}44 45static int container_device_attach(struct acpi_device *adev,46 const struct acpi_device_id *not_used)47{48 struct container_dev *cdev;49 struct device *dev;50 int ret;51 52 if (adev->flags.is_dock_station)53 return 0;54 55 cdev = kzalloc(sizeof(*cdev), GFP_KERNEL);56 if (!cdev)57 return -ENOMEM;58 59 cdev->offline = acpi_container_offline;60 dev = &cdev->dev;61 dev->bus = &container_subsys;62 dev_set_name(dev, "%s", dev_name(&adev->dev));63 ACPI_COMPANION_SET(dev, adev);64 dev->release = acpi_container_release;65 ret = device_register(dev);66 if (ret) {67 put_device(dev);68 return ret;69 }70 adev->driver_data = dev;71 return 1;72}73 74static void container_device_detach(struct acpi_device *adev)75{76 struct device *dev = acpi_driver_data(adev);77 78 adev->driver_data = NULL;79 if (dev)80 device_unregister(dev);81}82 83static void container_device_online(struct acpi_device *adev)84{85 struct device *dev = acpi_driver_data(adev);86 87 kobject_uevent(&dev->kobj, KOBJ_ONLINE);88}89 90static struct acpi_scan_handler container_handler = {91 .ids = container_device_ids,92 .attach = container_device_attach,93 .detach = container_device_detach,94 .hotplug = {95 .enabled = true,96 .demand_offline = true,97 .notify_online = container_device_online,98 },99};100 101void __init acpi_container_init(void)102{103 acpi_scan_add_handler(&container_handler);104}105 106#else107 108static struct acpi_scan_handler container_handler = {109 .ids = container_device_ids,110};111 112void __init acpi_container_init(void)113{114 acpi_scan_add_handler_with_hotplug(&container_handler, "container");115}116 117#endif /* CONFIG_ACPI_CONTAINER */118