xref: /openbmc/linux/drivers/acpi/container.c (revision abda0af4)
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 
check_offline(struct acpi_device * adev,void * not_used)26 static int check_offline(struct acpi_device *adev, void *not_used)
27 {
28 	if (acpi_scan_is_offline(adev, false))
29 		return 0;
30 
31 	return -EBUSY;
32 }
33 
acpi_container_offline(struct container_dev * cdev)34 static 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), check_offline, NULL);
38 }
39 
acpi_container_release(struct device * dev)40 static void acpi_container_release(struct device *dev)
41 {
42 	kfree(to_container_dev(dev));
43 }
44 
container_device_attach(struct acpi_device * adev,const struct acpi_device_id * not_used)45 static 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, "%s", dev_name(&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 
container_device_detach(struct acpi_device * adev)74 static void container_device_detach(struct acpi_device *adev)
75 {
76 	struct device *dev = acpi_driver_data(adev);
77 
78 	adev->driver_data = NULL;
79 	if (dev)
80 		device_unregister(dev);
81 }
82 
container_device_online(struct acpi_device * adev)83 static void container_device_online(struct acpi_device *adev)
84 {
85 	struct device *dev = acpi_driver_data(adev);
86 
87 	kobject_uevent(&dev->kobj, KOBJ_ONLINE);
88 }
89 
90 static 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 
acpi_container_init(void)101 void __init acpi_container_init(void)
102 {
103 	acpi_scan_add_handler(&container_handler);
104 }
105 
106 #else
107 
108 static struct acpi_scan_handler container_handler = {
109 	.ids = container_device_ids,
110 };
111 
acpi_container_init(void)112 void __init acpi_container_init(void)
113 {
114 	acpi_scan_add_handler_with_hotplug(&container_handler, "container");
115 }
116 
117 #endif /* CONFIG_ACPI_CONTAINER */
118