kernel/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  *  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 _COMPONENT                      ACPI_CONTAINER_COMPONENT
  35 ACPI_MODULE_NAME("container");
  36
  37 static const struct acpi_device_id container_device_ids[] = {
  38         {"ACPI0004", 0},
  39         {"PNP0A05", 0},
  40         {"PNP0A06", 0},
  41         {"", 0},
  42 };
  43
  44 #ifdef CONFIG_ACPI_CONTAINER
  45
  46 static 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
  59 static void acpi_container_release(struct device *dev)
  60 {
  61         kfree(to_container_dev(dev));
  62 }
  63
  64 static 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         if (adev->flags.is_dock_station)
  72                 return 0;
  73
  74         cdev = kzalloc(sizeof(*cdev), GFP_KERNEL);
  75         if (!cdev)
  76                 return -ENOMEM;
  77
  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;
  88         }
  89         adev->driver_data = dev;
  90         return 1;
  91 }
  92
  93 static void container_device_detach(struct acpi_device *adev)
  94 {
  95         struct device *dev = acpi_driver_data(adev);
  96
  97         adev->driver_data = NULL;
  98         if (dev)
  99                 device_unregister(dev);
 100 }
 101
 102 static void container_device_online(struct acpi_device *adev)
 103 {
 104         struct device *dev = acpi_driver_data(adev);
 105
 106         kobject_uevent(&dev->kobj, KOBJ_ONLINE);
 107 }
 108
 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,
 117         },
 118 };
 119
 120 void __init acpi_container_init(void)
 121 {
 122         acpi_scan_add_handler(&container_handler);
 123 }
 124
 125 #else
 126
 127 static struct acpi_scan_handler container_handler = {
 128         .ids = container_device_ids,
 129 };
 130
 131 void __init acpi_container_init(void)
 132 {
 133         acpi_scan_add_handler_with_hotplug(&container_handler, "container");
 134 }
 135
 136 #endif /* CONFIG_ACPI_CONTAINER */