Input: i8042 - add Acer Aspire 5738z to nomux list
[linux-2.6-microblaze.git] / drivers / acpi / container.c
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
17 #define _COMPONENT                      ACPI_CONTAINER_COMPONENT
18 ACPI_MODULE_NAME("container");
19
20 static const struct acpi_device_id container_device_ids[] = {
21         {"ACPI0004", 0},
22         {"PNP0A05", 0},
23         {"PNP0A06", 0},
24         {"", 0},
25 };
26
27 #ifdef CONFIG_ACPI_CONTAINER
28
29 static int acpi_container_offline(struct container_dev *cdev)
30 {
31         struct acpi_device *adev = ACPI_COMPANION(&cdev->dev);
32         struct acpi_device *child;
33
34         /* Check all of the dependent devices' physical companions. */
35         list_for_each_entry(child, &adev->children, node)
36                 if (!acpi_scan_is_offline(child, false))
37                         return -EBUSY;
38
39         return 0;
40 }
41
42 static void acpi_container_release(struct device *dev)
43 {
44         kfree(to_container_dev(dev));
45 }
46
47 static int container_device_attach(struct acpi_device *adev,
48                                    const struct acpi_device_id *not_used)
49 {
50         struct container_dev *cdev;
51         struct device *dev;
52         int ret;
53
54         if (adev->flags.is_dock_station)
55                 return 0;
56
57         cdev = kzalloc(sizeof(*cdev), GFP_KERNEL);
58         if (!cdev)
59                 return -ENOMEM;
60
61         cdev->offline = acpi_container_offline;
62         dev = &cdev->dev;
63         dev->bus = &container_subsys;
64         dev_set_name(dev, "%s", dev_name(&adev->dev));
65         ACPI_COMPANION_SET(dev, adev);
66         dev->release = acpi_container_release;
67         ret = device_register(dev);
68         if (ret) {
69                 put_device(dev);
70                 return ret;
71         }
72         adev->driver_data = dev;
73         return 1;
74 }
75
76 static void container_device_detach(struct acpi_device *adev)
77 {
78         struct device *dev = acpi_driver_data(adev);
79
80         adev->driver_data = NULL;
81         if (dev)
82                 device_unregister(dev);
83 }
84
85 static void container_device_online(struct acpi_device *adev)
86 {
87         struct device *dev = acpi_driver_data(adev);
88
89         kobject_uevent(&dev->kobj, KOBJ_ONLINE);
90 }
91
92 static struct acpi_scan_handler container_handler = {
93         .ids = container_device_ids,
94         .attach = container_device_attach,
95         .detach = container_device_detach,
96         .hotplug = {
97                 .enabled = true,
98                 .demand_offline = true,
99                 .notify_online = container_device_online,
100         },
101 };
102
103 void __init acpi_container_init(void)
104 {
105         acpi_scan_add_handler(&container_handler);
106 }
107
108 #else
109
110 static struct acpi_scan_handler container_handler = {
111         .ids = container_device_ids,
112 };
113
114 void __init acpi_container_init(void)
115 {
116         acpi_scan_add_handler_with_hotplug(&container_handler, "container");
117 }
118
119 #endif /* CONFIG_ACPI_CONTAINER */