drivers/acpi/container.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * container.c  - ACPI Generic Container Driver
   4  *
   5  * Copyright (C) 2004 Anil S Keshavamurthy (anil.s.keshavamurthy@intel.com)
   6  * Copyright (C) 2004 Keiichiro Tokunaga (tokunaga.keiich@jp.fujitsu.com)
   7  * Copyright (C) 2004 Motoyuki Ito (motoyuki@soft.fujitsu.com)
   8  * Copyright (C) 2004 FUJITSU LIMITED
   9  * Copyright (C) 2004, 2013 Intel Corp.
  10  * Author: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
  11  */
  12 #include <linux/acpi.h>
  13 #include <linux/container.h>
  14
  15 #include "internal.h"
  16
  17 static const struct acpi_device_id container_device_ids[] = {
  18         {"ACPI0004", 0},
  19         {"PNP0A05", 0},
  20         {"PNP0A06", 0},
  21         {"", 0},
  22 };
  23
  24 #ifdef CONFIG_ACPI_CONTAINER
  25
  26 static int acpi_container_offline(struct container_dev *cdev)
  27 {
  28         struct acpi_device *adev = ACPI_COMPANION(&cdev->dev);
  29         struct acpi_device *child;
  30
  31         /* Check all of the dependent devices' physical companions. */
  32         list_for_each_entry(child, &adev->children, node)
  33                 if (!acpi_scan_is_offline(child, false))
  34                         return -EBUSY;
  35
  36         return 0;
  37 }
  38
  39 static void acpi_container_release(struct device *dev)
  40 {
  41         kfree(to_container_dev(dev));
  42 }
  43
  44 static int container_device_attach(struct acpi_device *adev,
  45                                    const struct acpi_device_id *not_used)
  46 {
  47         struct container_dev *cdev;
  48         struct device *dev;
  49         int ret;
  50
  51         if (adev->flags.is_dock_station)
  52                 return 0;
  53
  54         cdev = kzalloc(sizeof(*cdev), GFP_KERNEL);
  55         if (!cdev)
  56                 return -ENOMEM;
  57
  58         cdev->offline = acpi_container_offline;
  59         dev = &cdev->dev;
  60         dev->bus = &container_subsys;
  61         dev_set_name(dev, "%s", dev_name(&adev->dev));
  62         ACPI_COMPANION_SET(dev, adev);
  63         dev->release = acpi_container_release;
  64         ret = device_register(dev);
  65         if (ret) {
  66                 put_device(dev);
  67                 return ret;
  68         }
  69         adev->driver_data = dev;
  70         return 1;
  71 }
  72
  73 static void container_device_detach(struct acpi_device *adev)
  74 {
  75         struct device *dev = acpi_driver_data(adev);
  76
  77         adev->driver_data = NULL;
  78         if (dev)
  79                 device_unregister(dev);
  80 }
  81
  82 static void container_device_online(struct acpi_device *adev)
  83 {
  84         struct device *dev = acpi_driver_data(adev);
  85
  86         kobject_uevent(&dev->kobj, KOBJ_ONLINE);
  87 }
  88
  89 static struct acpi_scan_handler container_handler = {
  90         .ids = container_device_ids,
  91         .attach = container_device_attach,
  92         .detach = container_device_detach,
  93         .hotplug = {
  94                 .enabled = true,
  95                 .demand_offline = true,
  96                 .notify_online = container_device_online,
  97         },
  98 };
  99
 100 void __init acpi_container_init(void)
 101 {
 102         acpi_scan_add_handler(&container_handler);
 103 }
 104
 105 #else
 106
 107 static struct acpi_scan_handler container_handler = {
 108         .ids = container_device_ids,
 109 };
 110
 111 void __init acpi_container_init(void)
 112 {
 113         acpi_scan_add_handler_with_hotplug(&container_handler, "container");
 114 }
 115
 116 #endif /* CONFIG_ACPI_CONTAINER */