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 static int acpi_container_offline(struct container_dev *cdev)
  45 {
  46         struct acpi_device *adev = ACPI_COMPANION(&cdev->dev);
  47         struct acpi_device *child;
  48
  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))
  52                         return -EBUSY;
  53
  54         return 0;
  55 }
  56
  57 static void acpi_container_release(struct device *dev)
  58 {
  59         kfree(to_container_dev(dev));
  60 }
  61
  62 static int container_device_attach(struct acpi_device *adev,
  63                                    const struct acpi_device_id *not_used)
  64 {
  65         struct container_dev *cdev;
  66         struct device *dev;
  67         int ret;
  68
  69         if (adev->flags.is_dock_station)
  70                 return 0;
  71
  72         cdev = kzalloc(sizeof(*cdev), GFP_KERNEL);
  73         if (!cdev)
  74                 return -ENOMEM;
  75
  76         cdev->offline = acpi_container_offline;
  77         dev = &cdev->dev;
  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);
  83         if (ret) {
  84                 put_device(dev);
  85                 return ret;
  86         }
  87         adev->driver_data = dev;
  88         return 1;
  89 }
  90
  91 static void container_device_detach(struct acpi_device *adev)
  92 {
  93         struct device *dev = acpi_driver_data(adev);
  94
  95         adev->driver_data = NULL;
  96         if (dev)
  97                 device_unregister(dev);
  98 }
  99
 100 static struct acpi_scan_handler container_handler = {
 101         .ids = container_device_ids,
 102         .attach = container_device_attach,
 103         .detach = container_device_detach,
 104         .hotplug = {
 105                 .enabled = true,
 106                 .demand_offline = true,
 107         },
 108 };
 109
 110 void __init acpi_container_init(void)
 111 {
 112         acpi_scan_add_handler_with_hotplug(&container_handler, "container");
 113 }