/* * container.c - ACPI Generic Container Driver * * Copyright (C) 2004 Anil S Keshavamurthy (anil.s.keshavamurthy@intel.com) * Copyright (C) 2004 Keiichiro Tokunaga (tokunaga.keiich@jp.fujitsu.com) * Copyright (C) 2004 Motoyuki Ito (motoyuki@soft.fujitsu.com) * Copyright (C) 2004 FUJITSU LIMITED * Copyright (C) 2004, 2013 Intel Corp. * Author: Rafael J. Wysocki <rafael.j.wysocki@intel.com> * * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or (at * your option) any later version. * * This program is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * General Public License for more details. * * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ */ #include <linux/acpi.h> #include <linux/container.h> #include "internal.h" #define _COMPONENT ACPI_CONTAINER_COMPONENT ACPI_MODULE_NAME("container"); static const struct acpi_device_id container_device_ids[] = { {"ACPI0004", 0}, {"PNP0A05", 0}, {"PNP0A06", 0}, {"", 0}, }; #ifdef CONFIG_ACPI_CONTAINER static int acpi_container_offline(struct container_dev *cdev) { struct acpi_device *adev = ACPI_COMPANION(&cdev->dev); struct acpi_device *child; /* Check all of the dependent devices' physical companions. */ list_for_each_entry(child, &adev->children, node) if (!acpi_scan_is_offline(child, false)) return -EBUSY; return 0; } static void acpi_container_release(struct device *dev) { kfree(to_container_dev(dev)); } static int container_device_attach(struct acpi_device *adev, const struct acpi_device_id *not_used) { struct container_dev *cdev; struct device *dev; int ret; if (adev->flags.is_dock_station) return 0; cdev = kzalloc(sizeof(*cdev), GFP_KERNEL); if (!cdev) return -ENOMEM; cdev->offline = acpi_container_offline; dev = &cdev->dev; dev->bus = &container_subsys; dev_set_name(dev, "%s", dev_name(&adev->dev)); ACPI_COMPANION_SET(dev, adev); dev->release = acpi_container_release; ret = device_register(dev); if (ret) { put_device(dev); return ret; } adev->driver_data = dev; return 1; } static void container_device_detach(struct acpi_device *adev) { struct device *dev = acpi_driver_data(adev); adev->driver_data = NULL; if (dev) device_unregister(dev); } static void container_device_online(struct acpi_device *adev) { struct device *dev = acpi_driver_data(adev); kobject_uevent(&dev->kobj, KOBJ_ONLINE); } static struct acpi_scan_handler container_handler = { .ids = container_device_ids, .attach = container_device_attach, .detach = container_device_detach, .hotplug = { .enabled = true, .demand_offline = true, .notify_online = container_device_online, }, }; void __init acpi_container_init(void) { acpi_scan_add_handler(&container_handler); } #else static struct acpi_scan_handler container_handler = { .ids = container_device_ids, }; void __init acpi_container_init(void) { acpi_scan_add_handler_with_hotplug(&container_handler, "container"); } #endif /* CONFIG_ACPI_CONTAINER */