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 check_offline(struct acpi_device *adev, void *not_used) 27 { 28 if (acpi_scan_is_offline(adev, false)) 29 return 0; 30 31 return -EBUSY; 32 } 33 34 static int acpi_container_offline(struct container_dev *cdev) 35 { 36 /* Check all of the dependent devices' physical companions. */ 37 return acpi_dev_for_each_child(ACPI_COMPANION(&cdev->dev), check_offline, NULL); 38 } 39 40 static void acpi_container_release(struct device *dev) 41 { 42 kfree(to_container_dev(dev)); 43 } 44 45 static int container_device_attach(struct acpi_device *adev, 46 const struct acpi_device_id *not_used) 47 { 48 struct container_dev *cdev; 49 struct device *dev; 50 int ret; 51 52 if (adev->flags.is_dock_station) 53 return 0; 54 55 cdev = kzalloc(sizeof(*cdev), GFP_KERNEL); 56 if (!cdev) 57 return -ENOMEM; 58 59 cdev->offline = acpi_container_offline; 60 dev = &cdev->dev; 61 dev->bus = &container_subsys; 62 dev_set_name(dev, "%s", dev_name(&adev->dev)); 63 ACPI_COMPANION_SET(dev, adev); 64 dev->release = acpi_container_release; 65 ret = device_register(dev); 66 if (ret) { 67 put_device(dev); 68 return ret; 69 } 70 adev->driver_data = dev; 71 return 1; 72 } 73 74 static void container_device_detach(struct acpi_device *adev) 75 { 76 struct device *dev = acpi_driver_data(adev); 77 78 adev->driver_data = NULL; 79 if (dev) 80 device_unregister(dev); 81 } 82 83 static void container_device_online(struct acpi_device *adev) 84 { 85 struct device *dev = acpi_driver_data(adev); 86 87 kobject_uevent(&dev->kobj, KOBJ_ONLINE); 88 } 89 90 static struct acpi_scan_handler container_handler = { 91 .ids = container_device_ids, 92 .attach = container_device_attach, 93 .detach = container_device_detach, 94 .hotplug = { 95 .enabled = true, 96 .demand_offline = true, 97 .notify_online = container_device_online, 98 }, 99 }; 100 101 void __init acpi_container_init(void) 102 { 103 acpi_scan_add_handler(&container_handler); 104 } 105 106 #else 107 108 static struct acpi_scan_handler container_handler = { 109 .ids = container_device_ids, 110 }; 111 112 void __init acpi_container_init(void) 113 { 114 acpi_scan_add_handler_with_hotplug(&container_handler, "container"); 115 } 116 117 #endif /* CONFIG_ACPI_CONTAINER */ 118