Linux 4.1.16
[linux/fpc-iii.git] / drivers / acpi / container.c
blobc8ead9f97375342130a43aed57487ead8363133b
1 /*
2 * container.c - ACPI Generic Container Driver
4 * Copyright (C) 2004 Anil S Keshavamurthy (anil.s.keshavamurthy@intel.com)
5 * Copyright (C) 2004 Keiichiro Tokunaga (tokunaga.keiich@jp.fujitsu.com)
6 * Copyright (C) 2004 Motoyuki Ito (motoyuki@soft.fujitsu.com)
7 * Copyright (C) 2004 FUJITSU LIMITED
8 * Copyright (C) 2004, 2013 Intel Corp.
9 * Author: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
11 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
13 * This program is free software; you can redistribute it and/or modify
14 * it under the terms of the GNU General Public License as published by
15 * the Free Software Foundation; either version 2 of the License, or (at
16 * your option) any later version.
18 * This program is distributed in the hope that it will be useful, but
19 * WITHOUT ANY WARRANTY; without even the implied warranty of
20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
21 * General Public License for more details.
23 * You should have received a copy of the GNU General Public License along
24 * with this program; if not, write to the Free Software Foundation, Inc.,
25 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
27 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
29 #include <linux/acpi.h>
30 #include <linux/container.h>
32 #include "internal.h"
34 #define _COMPONENT ACPI_CONTAINER_COMPONENT
35 ACPI_MODULE_NAME("container");
37 static const struct acpi_device_id container_device_ids[] = {
38 {"ACPI0004", 0},
39 {"PNP0A05", 0},
40 {"PNP0A06", 0},
41 {"", 0},
44 #ifdef CONFIG_ACPI_CONTAINER
46 static int acpi_container_offline(struct container_dev *cdev)
48 struct acpi_device *adev = ACPI_COMPANION(&cdev->dev);
49 struct acpi_device *child;
51 /* Check all of the dependent devices' physical companions. */
52 list_for_each_entry(child, &adev->children, node)
53 if (!acpi_scan_is_offline(child, false))
54 return -EBUSY;
56 return 0;
59 static void acpi_container_release(struct device *dev)
61 kfree(to_container_dev(dev));
64 static int container_device_attach(struct acpi_device *adev,
65 const struct acpi_device_id *not_used)
67 struct container_dev *cdev;
68 struct device *dev;
69 int ret;
71 if (adev->flags.is_dock_station)
72 return 0;
74 cdev = kzalloc(sizeof(*cdev), GFP_KERNEL);
75 if (!cdev)
76 return -ENOMEM;
78 cdev->offline = acpi_container_offline;
79 dev = &cdev->dev;
80 dev->bus = &container_subsys;
81 dev_set_name(dev, "%s", dev_name(&adev->dev));
82 ACPI_COMPANION_SET(dev, adev);
83 dev->release = acpi_container_release;
84 ret = device_register(dev);
85 if (ret) {
86 put_device(dev);
87 return ret;
89 adev->driver_data = dev;
90 return 1;
93 static void container_device_detach(struct acpi_device *adev)
95 struct device *dev = acpi_driver_data(adev);
97 adev->driver_data = NULL;
98 if (dev)
99 device_unregister(dev);
102 static void container_device_online(struct acpi_device *adev)
104 struct device *dev = acpi_driver_data(adev);
106 kobject_uevent(&dev->kobj, KOBJ_ONLINE);
109 static struct acpi_scan_handler container_handler = {
110 .ids = container_device_ids,
111 .attach = container_device_attach,
112 .detach = container_device_detach,
113 .hotplug = {
114 .enabled = true,
115 .demand_offline = true,
116 .notify_online = container_device_online,
120 void __init acpi_container_init(void)
122 acpi_scan_add_handler(&container_handler);
125 #else
127 static struct acpi_scan_handler container_handler = {
128 .ids = container_device_ids,
131 void __init acpi_container_init(void)
133 acpi_scan_add_handler_with_hotplug(&container_handler, "container");
136 #endif /* CONFIG_ACPI_CONTAINER */