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 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
24 */
25#include <linux/acpi.h>
26#include <linux/container.h>
27
28#include "internal.h"
29
30#define _COMPONENT ACPI_CONTAINER_COMPONENT
31ACPI_MODULE_NAME("container");
32
33static const struct acpi_device_id container_device_ids[] = {
34 {"ACPI0004", 0},
35 {"PNP0A05", 0},
36 {"PNP0A06", 0},
37 {"", 0},
38};
39
40#ifdef CONFIG_ACPI_CONTAINER
41
42static int acpi_container_offline(struct container_dev *cdev)
43{
44 struct acpi_device *adev = ACPI_COMPANION(&cdev->dev);
45 struct acpi_device *child;
46
47 /* Check all of the dependent devices' physical companions. */
48 list_for_each_entry(child, &adev->children, node)
49 if (!acpi_scan_is_offline(child, false))
50 return -EBUSY;
51
52 return 0;
53}
54
55static void acpi_container_release(struct device *dev)
56{
57 kfree(to_container_dev(dev));
58}
59
60static int container_device_attach(struct acpi_device *adev,
61 const struct acpi_device_id *not_used)
62{
63 struct container_dev *cdev;
64 struct device *dev;
65 int ret;
66
67 if (adev->flags.is_dock_station)
68 return 0;
69
70 cdev = kzalloc(sizeof(*cdev), GFP_KERNEL);
71 if (!cdev)
72 return -ENOMEM;
73
74 cdev->offline = acpi_container_offline;
75 dev = &cdev->dev;
76 dev->bus = &container_subsys;
77 dev_set_name(dev, "%s", dev_name(&adev->dev));
78 ACPI_COMPANION_SET(dev, adev);
79 dev->release = acpi_container_release;
80 ret = device_register(dev);
81 if (ret) {
82 put_device(dev);
83 return ret;
84 }
85 adev->driver_data = dev;
86 return 1;
87}
88
89static void container_device_detach(struct acpi_device *adev)
90{
91 struct device *dev = acpi_driver_data(adev);
92
93 adev->driver_data = NULL;
94 if (dev)
95 device_unregister(dev);
96}
97
98static void container_device_online(struct acpi_device *adev)
99{
100 struct device *dev = acpi_driver_data(adev);
101
102 kobject_uevent(&dev->kobj, KOBJ_ONLINE);
103}
104
105static struct acpi_scan_handler container_handler = {
106 .ids = container_device_ids,
107 .attach = container_device_attach,
108 .detach = container_device_detach,
109 .hotplug = {
110 .enabled = true,
111 .demand_offline = true,
112 .notify_online = container_device_online,
113 },
114};
115
116void __init acpi_container_init(void)
117{
118 acpi_scan_add_handler(&container_handler);
119}
120
121#else
122
123static struct acpi_scan_handler container_handler = {
124 .ids = container_device_ids,
125};
126
127void __init acpi_container_init(void)
128{
129 acpi_scan_add_handler_with_hotplug(&container_handler, "container");
130}
131
132#endif /* CONFIG_ACPI_CONTAINER */
133