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
17static 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
26static int check_offline(struct acpi_device *adev, void *not_used)
27{
28 if (acpi_scan_is_offline(adev, uevent: false))
29 return 0;
30
31 return -EBUSY;
32}
33
34static int acpi_container_offline(struct container_dev *cdev)
35{
36 /* Check all of the dependent devices' physical companions. */
37 return acpi_dev_for_each_child(ACPI_COMPANION(&cdev->dev), fn: check_offline, NULL);
38}
39
40static void acpi_container_release(struct device *dev)
41{
42 kfree(objp: to_container_dev(dev));
43}
44
45static int container_device_attach(struct acpi_device *adev,
46 const struct acpi_device_id *not_used)
47{
48 struct container_dev *cdev;
49 struct device *dev;
50 int ret;
51
52 if (adev->flags.is_dock_station)
53 return 0;
54
55 cdev = kzalloc(sizeof(*cdev), GFP_KERNEL);
56 if (!cdev)
57 return -ENOMEM;
58
59 cdev->offline = acpi_container_offline;
60 dev = &cdev->dev;
61 dev->bus = &container_subsys;
62 dev_set_name(dev, name: "%s", dev_name(dev: &adev->dev));
63 ACPI_COMPANION_SET(dev, adev);
64 dev->release = acpi_container_release;
65 ret = device_register(dev);
66 if (ret) {
67 put_device(dev);
68 return ret;
69 }
70 adev->driver_data = dev;
71 return 1;
72}
73
74static void container_device_detach(struct acpi_device *adev)
75{
76 struct device *dev = acpi_driver_data(d: adev);
77
78 adev->driver_data = NULL;
79 if (dev)
80 device_unregister(dev);
81}
82
83static void container_device_online(struct acpi_device *adev)
84{
85 struct device *dev = acpi_driver_data(d: adev);
86
87 kobject_uevent(kobj: &dev->kobj, action: KOBJ_ONLINE);
88}
89
90static struct acpi_scan_handler container_handler = {
91 .ids = container_device_ids,
92 .attach = container_device_attach,
93 .detach = container_device_detach,
94 .hotplug = {
95 .enabled = true,
96 .demand_offline = true,
97 .notify_online = container_device_online,
98 },
99};
100
101void __init acpi_container_init(void)
102{
103 acpi_scan_add_handler(handler: &container_handler);
104}
105
106#else
107
108static struct acpi_scan_handler container_handler = {
109 .ids = container_device_ids,
110};
111
112void __init acpi_container_init(void)
113{
114 acpi_scan_add_handler_with_hotplug(&container_handler, "container");
115}
116
117#endif /* CONFIG_ACPI_CONTAINER */
118

source code of linux/drivers/acpi/container.c