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