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