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