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 PREFIX "ACPI: " 35 36 #define _COMPONENT ACPI_CONTAINER_COMPONENT 37 ACPI_MODULE_NAME("container"); 38 39 static const struct acpi_device_id container_device_ids[] = { 40 {"ACPI0004", 0}, 41 {"PNP0A05", 0}, 42 {"PNP0A06", 0}, 43 {"", 0}, 44 }; 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 cdev = kzalloc(sizeof(*cdev), GFP_KERNEL); 72 if (!cdev) 73 return -ENOMEM; 74 75 cdev->offline = acpi_container_offline; 76 dev = &cdev->dev; 77 dev->bus = &container_subsys; 78 dev_set_name(dev, "%s", dev_name(&adev->dev)); 79 ACPI_COMPANION_SET(dev, adev); 80 dev->release = acpi_container_release; 81 ret = device_register(dev); 82 if (ret) 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 struct acpi_scan_handler container_handler = { 99 .ids = container_device_ids, 100 .attach = container_device_attach, 101 .detach = container_device_detach, 102 .hotplug = { 103 .enabled = true, 104 .demand_offline = true, 105 }, 106 }; 107 108 void __init acpi_container_init(void) 109 { 110 acpi_scan_add_handler_with_hotplug(&container_handler, "container"); 111 } 112