1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * container.c  - ACPI Generic Container Driver
4 *
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 LIMITED
9 * 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_CONTAINER
25
26static int acpi_container_offline(struct container_dev *cdev)
27{
28	struct acpi_device *adev = ACPI_COMPANION(&cdev->dev);
29	struct acpi_device *child;
30
31	/* Check all of the dependent devices' physical companions. */
32	list_for_each_entry(child, &adev->children, node)
33		if (!acpi_scan_is_offline(child, false))
34			return -EBUSY;
35
36	return 0;
37}
38
39static void acpi_container_release(struct device *dev)
40{
41	kfree(to_container_dev(dev));
42}
43
44static int container_device_attach(struct acpi_device *adev,
45				   const struct acpi_device_id *not_used)
46{
47	struct container_dev *cdev;
48	struct device *dev;
49	int ret;
50
51	if (adev->flags.is_dock_station)
52		return 0;
53
54	cdev = kzalloc(sizeof(*cdev), GFP_KERNEL);
55	if (!cdev)
56		return -ENOMEM;
57
58	cdev->offline = acpi_container_offline;
59	dev = &cdev->dev;
60	dev->bus = &container_subsys;
61	dev_set_name(dev, "%s", dev_name(&adev->dev));
62	ACPI_COMPANION_SET(dev, adev);
63	dev->release = acpi_container_release;
64	ret = device_register(dev);
65	if (ret) {
66		put_device(dev);
67		return ret;
68	}
69	adev->driver_data = dev;
70	return 1;
71}
72
73static void container_device_detach(struct acpi_device *adev)
74{
75	struct device *dev = acpi_driver_data(adev);
76
77	adev->driver_data = NULL;
78	if (dev)
79		device_unregister(dev);
80}
81
82static void container_device_online(struct acpi_device *adev)
83{
84	struct device *dev = acpi_driver_data(adev);
85
86	kobject_uevent(&dev->kobj, KOBJ_ONLINE);
87}
88
89static struct acpi_scan_handler container_handler = {
90	.ids = container_device_ids,
91	.attach = container_device_attach,
92	.detach = container_device_detach,
93	.hotplug = {
94		.enabled = true,
95		.demand_offline = true,
96		.notify_online = container_device_online,
97	},
98};
99
100void __init acpi_container_init(void)
101{
102	acpi_scan_add_handler(&container_handler);
103}
104
105#else
106
107static struct acpi_scan_handler container_handler = {
108	.ids = container_device_ids,
109};
110
111void __init acpi_container_init(void)
112{
113	acpi_scan_add_handler_with_hotplug(&container_handler, "container");
114}
115
116#endif /* CONFIG_ACPI_CONTAINER */
117