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>
34 #define _COMPONENT ACPI_CONTAINER_COMPONENT
35 ACPI_MODULE_NAME("container");
37 static const struct acpi_device_id container_device_ids[] = {
44 static int acpi_container_offline(struct container_dev *cdev)
46 struct acpi_device *adev = ACPI_COMPANION(&cdev->dev);
47 struct acpi_device *child;
49 /* Check all of the dependent devices' physical companions. */
50 list_for_each_entry(child, &adev->children, node)
51 if (!acpi_scan_is_offline(child, false))
57 static void acpi_container_release(struct device *dev)
59 kfree(to_container_dev(dev));
62 static int container_device_attach(struct acpi_device *adev,
63 const struct acpi_device_id *not_used)
65 struct container_dev *cdev;
69 if (adev->flags.is_dock_station)
72 cdev = kzalloc(sizeof(*cdev), GFP_KERNEL);
76 cdev->offline = acpi_container_offline;
78 dev->bus = &container_subsys;
79 dev_set_name(dev, "%s", dev_name(&adev->dev));
80 ACPI_COMPANION_SET(dev, adev);
81 dev->release = acpi_container_release;
82 ret = device_register(dev);
87 adev->driver_data = dev;
91 static void container_device_detach(struct acpi_device *adev)
93 struct device *dev = acpi_driver_data(adev);
95 adev->driver_data = NULL;
97 device_unregister(dev);
100 static struct acpi_scan_handler container_handler = {
101 .ids = container_device_ids,
102 .attach = container_device_attach,
103 .detach = container_device_detach,
106 .demand_offline = true,
110 void __init acpi_container_init(void)
112 acpi_scan_add_handler_with_hotplug(&container_handler, "container");