Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
1/*
2 * container.c - ACPI Generic Container Driver
3 *
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>
10 *
11 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
12 *
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.
17 *
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.
22 *
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.
26 *
27 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
28 */
29#include <linux/acpi.h>
30#include <linux/container.h>
31
32#include "internal.h"
33
34#define PREFIX "ACPI: "
35
36#define _COMPONENT ACPI_CONTAINER_COMPONENT
37ACPI_MODULE_NAME("container");
38
39static const struct acpi_device_id container_device_ids[] = {
40 {"ACPI0004", 0},
41 {"PNP0A05", 0},
42 {"PNP0A06", 0},
43 {"", 0},
44};
45
46static int acpi_container_offline(struct container_dev *cdev)
47{
48 struct acpi_device *adev = ACPI_COMPANION(&cdev->dev);
49 struct acpi_device *child;
50
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;
55
56 return 0;
57}
58
59static void acpi_container_release(struct device *dev)
60{
61 kfree(to_container_dev(dev));
62}
63
64static int container_device_attach(struct acpi_device *adev,
65 const struct acpi_device_id *not_used)
66{
67 struct container_dev *cdev;
68 struct device *dev;
69 int ret;
70
71 cdev = kzalloc(sizeof(*cdev), GFP_KERNEL);
72 if (!cdev)
73 return -ENOMEM;
74
75 cdev->offline = acpi_container_offline;
76 dev = &cdev->dev;
77 dev->bus = &container_subsys;
78 dev_set_name(dev, "%s", dev_name(&adev->dev));
79 ACPI_COMPANION_SET(dev, adev);
80 dev->release = acpi_container_release;
81 ret = device_register(dev);
82 if (ret) {
83 put_device(dev);
84 return ret;
85 }
86 adev->driver_data = dev;
87 return 1;
88}
89
90static void container_device_detach(struct acpi_device *adev)
91{
92 struct device *dev = acpi_driver_data(adev);
93
94 adev->driver_data = NULL;
95 if (dev)
96 device_unregister(dev);
97}
98
99static struct acpi_scan_handler container_handler = {
100 .ids = container_device_ids,
101 .attach = container_device_attach,
102 .detach = container_device_detach,
103 .hotplug = {
104 .enabled = true,
105 .demand_offline = true,
106 },
107};
108
109void __init acpi_container_init(void)
110{
111 acpi_scan_add_handler_with_hotplug(&container_handler, "container");
112}