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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  *  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 */
137 

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