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Linux/drivers/acpi/container.c

  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  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 24  */
 25 #include <linux/acpi.h>
 26 #include <linux/container.h>
 27 
 28 #include "internal.h"
 29 
 30 #define _COMPONENT                      ACPI_CONTAINER_COMPONENT
 31 ACPI_MODULE_NAME("container");
 32 
 33 static const struct acpi_device_id container_device_ids[] = {
 34         {"ACPI0004", 0},
 35         {"PNP0A05", 0},
 36         {"PNP0A06", 0},
 37         {"", 0},
 38 };
 39 
 40 #ifdef CONFIG_ACPI_CONTAINER
 41 
 42 static int acpi_container_offline(struct container_dev *cdev)
 43 {
 44         struct acpi_device *adev = ACPI_COMPANION(&cdev->dev);
 45         struct acpi_device *child;
 46 
 47         /* Check all of the dependent devices' physical companions. */
 48         list_for_each_entry(child, &adev->children, node)
 49                 if (!acpi_scan_is_offline(child, false))
 50                         return -EBUSY;
 51 
 52         return 0;
 53 }
 54 
 55 static void acpi_container_release(struct device *dev)
 56 {
 57         kfree(to_container_dev(dev));
 58 }
 59 
 60 static int container_device_attach(struct acpi_device *adev,
 61                                    const struct acpi_device_id *not_used)
 62 {
 63         struct container_dev *cdev;
 64         struct device *dev;
 65         int ret;
 66 
 67         if (adev->flags.is_dock_station)
 68                 return 0;
 69 
 70         cdev = kzalloc(sizeof(*cdev), GFP_KERNEL);
 71         if (!cdev)
 72                 return -ENOMEM;
 73 
 74         cdev->offline = acpi_container_offline;
 75         dev = &cdev->dev;
 76         dev->bus = &container_subsys;
 77         dev_set_name(dev, "%s", dev_name(&adev->dev));
 78         ACPI_COMPANION_SET(dev, adev);
 79         dev->release = acpi_container_release;
 80         ret = device_register(dev);
 81         if (ret) {
 82                 put_device(dev);
 83                 return ret;
 84         }
 85         adev->driver_data = dev;
 86         return 1;
 87 }
 88 
 89 static void container_device_detach(struct acpi_device *adev)
 90 {
 91         struct device *dev = acpi_driver_data(adev);
 92 
 93         adev->driver_data = NULL;
 94         if (dev)
 95                 device_unregister(dev);
 96 }
 97 
 98 static void container_device_online(struct acpi_device *adev)
 99 {
100         struct device *dev = acpi_driver_data(adev);
101 
102         kobject_uevent(&dev->kobj, KOBJ_ONLINE);
103 }
104 
105 static struct acpi_scan_handler container_handler = {
106         .ids = container_device_ids,
107         .attach = container_device_attach,
108         .detach = container_device_detach,
109         .hotplug = {
110                 .enabled = true,
111                 .demand_offline = true,
112                 .notify_online = container_device_online,
113         },
114 };
115 
116 void __init acpi_container_init(void)
117 {
118         acpi_scan_add_handler(&container_handler);
119 }
120 
121 #else
122 
123 static struct acpi_scan_handler container_handler = {
124         .ids = container_device_ids,
125 };
126 
127 void __init acpi_container_init(void)
128 {
129         acpi_scan_add_handler_with_hotplug(&container_handler, "container");
130 }
131 
132 #endif /* CONFIG_ACPI_CONTAINER */
133 

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