GNU Linux-libre 4.4.289-gnu1
[releases.git] / drivers / acpi / container.c
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
31 ACPI_MODULE_NAME("container");
32
33 static 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
42 static 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
55 static void acpi_container_release(struct device *dev)
56 {
57         kfree(to_container_dev(dev));
58 }
59
60 static 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
89 static 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
98 static 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
105 static 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
116 void __init acpi_container_init(void)
117 {
118         acpi_scan_add_handler(&container_handler);
119 }
120
121 #else
122
123 static struct acpi_scan_handler container_handler = {
124         .ids = container_device_ids,
125 };
126
127 void __init acpi_container_init(void)
128 {
129         acpi_scan_add_handler_with_hotplug(&container_handler, "container");
130 }
131
132 #endif /* CONFIG_ACPI_CONTAINER */