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