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1/*
2 * container.c  - ACPI Generic Container Driver
3 *
4 * Copyright (C) 2004 Anil S Keshavamurthy (anil.s.keshavamurthy@intel.com)
5 * Copyright (C) 2004 Keiichiro Tokunaga (tokunaga.keiich@jp.fujitsu.com)
6 * Copyright (C) 2004 Motoyuki Ito (motoyuki@soft.fujitsu.com)
7 * Copyright (C) 2004 FUJITSU LIMITED
8 * Copyright (C) 2004, 2013 Intel Corp.
9 * Author: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
10 *
11 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
12 *
13 *  This program is free software; you can redistribute it and/or modify
14 *  it under the terms of the GNU General Public License as published by
15 *  the Free Software Foundation; either version 2 of the License, or (at
16 *  your option) any later version.
17 *
18 *  This program is distributed in the hope that it will be useful, but
19 *  WITHOUT ANY WARRANTY; without even the implied warranty of
20 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
21 *  General Public License for more details.
22 *
23 *  You should have received a copy of the GNU General Public License along
24 *  with this program; if not, write to the Free Software Foundation, Inc.,
25 *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
26 *
27 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
28 */
29#include <linux/acpi.h>
30#include <linux/container.h>
31
32#include "internal.h"
33
34#define _COMPONENT			ACPI_CONTAINER_COMPONENT
35ACPI_MODULE_NAME("container");
36
37static const struct acpi_device_id container_device_ids[] = {
38	{"ACPI0004", 0},
39	{"PNP0A05", 0},
40	{"PNP0A06", 0},
41	{"", 0},
42};
43
44#ifdef CONFIG_ACPI_CONTAINER
45
46static int acpi_container_offline(struct container_dev *cdev)
47{
48	struct acpi_device *adev = ACPI_COMPANION(&cdev->dev);
49	struct acpi_device *child;
50
51	/* Check all of the dependent devices' physical companions. */
52	list_for_each_entry(child, &adev->children, node)
53		if (!acpi_scan_is_offline(child, false))
54			return -EBUSY;
55
56	return 0;
57}
58
59static void acpi_container_release(struct device *dev)
60{
61	kfree(to_container_dev(dev));
62}
63
64static int container_device_attach(struct acpi_device *adev,
65				   const struct acpi_device_id *not_used)
66{
67	struct container_dev *cdev;
68	struct device *dev;
69	int ret;
70
71	if (adev->flags.is_dock_station)
72		return 0;
73
74	cdev = kzalloc(sizeof(*cdev), GFP_KERNEL);
75	if (!cdev)
76		return -ENOMEM;
77
78	cdev->offline = acpi_container_offline;
79	dev = &cdev->dev;
80	dev->bus = &container_subsys;
81	dev_set_name(dev, "%s", dev_name(&adev->dev));
82	ACPI_COMPANION_SET(dev, adev);
83	dev->release = acpi_container_release;
84	ret = device_register(dev);
85	if (ret) {
86		put_device(dev);
87		return ret;
88	}
89	adev->driver_data = dev;
90	return 1;
91}
92
93static void container_device_detach(struct acpi_device *adev)
94{
95	struct device *dev = acpi_driver_data(adev);
96
97	adev->driver_data = NULL;
98	if (dev)
99		device_unregister(dev);
100}
101
102static void container_device_online(struct acpi_device *adev)
103{
104	struct device *dev = acpi_driver_data(adev);
105
106	kobject_uevent(&dev->kobj, KOBJ_ONLINE);
107}
108
109static struct acpi_scan_handler container_handler = {
110	.ids = container_device_ids,
111	.attach = container_device_attach,
112	.detach = container_device_detach,
113	.hotplug = {
114		.enabled = true,
115		.demand_offline = true,
116		.notify_online = container_device_online,
117	},
118};
119
120void __init acpi_container_init(void)
121{
122	acpi_scan_add_handler(&container_handler);
123}
124
125#else
126
127static struct acpi_scan_handler container_handler = {
128	.ids = container_device_ids,
129};
130
131void __init acpi_container_init(void)
132{
133	acpi_scan_add_handler_with_hotplug(&container_handler, "container");
134}
135
136#endif /* CONFIG_ACPI_CONTAINER */
137