Merge tag 'usb-3.18-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb
[firefly-linux-kernel-4.4.55.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  *  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
35 ACPI_MODULE_NAME("container");
36
37 static 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
46 static 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
59 static void acpi_container_release(struct device *dev)
60 {
61         kfree(to_container_dev(dev));
62 }
63
64 static 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
93 static 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
102 static 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
109 static 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
120 void __init acpi_container_init(void)
121 {
122         acpi_scan_add_handler(&container_handler);
123 }
124
125 #else
126
127 static struct acpi_scan_handler container_handler = {
128         .ids = container_device_ids,
129 };
130
131 void __init acpi_container_init(void)
132 {
133         acpi_scan_add_handler_with_hotplug(&container_handler, "container");
134 }
135
136 #endif /* CONFIG_ACPI_CONTAINER */