117 lines
2.6 KiB
C
117 lines
2.6 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* container.c - ACPI Generic Container Driver
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*
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* Copyright (C) 2004 Anil S Keshavamurthy (anil.s.keshavamurthy@intel.com)
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* Copyright (C) 2004 Keiichiro Tokunaga (tokunaga.keiich@jp.fujitsu.com)
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* Copyright (C) 2004 Motoyuki Ito (motoyuki@soft.fujitsu.com)
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* Copyright (C) 2004 FUJITSU LIMITED
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* Copyright (C) 2004, 2013 Intel Corp.
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* Author: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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*/
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#include <linux/acpi.h>
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#include <linux/container.h>
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#include "internal.h"
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static const struct acpi_device_id container_device_ids[] = {
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{"ACPI0004", 0},
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{"PNP0A05", 0},
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{"PNP0A06", 0},
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{"", 0},
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};
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#ifdef CONFIG_ACPI_CONTAINER
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static int acpi_container_offline(struct container_dev *cdev)
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{
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struct acpi_device *adev = ACPI_COMPANION(&cdev->dev);
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struct acpi_device *child;
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/* Check all of the dependent devices' physical companions. */
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list_for_each_entry(child, &adev->children, node)
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if (!acpi_scan_is_offline(child, false))
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return -EBUSY;
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return 0;
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}
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static void acpi_container_release(struct device *dev)
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{
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kfree(to_container_dev(dev));
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}
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static int container_device_attach(struct acpi_device *adev,
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const struct acpi_device_id *not_used)
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{
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struct container_dev *cdev;
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struct device *dev;
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int ret;
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if (adev->flags.is_dock_station)
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return 0;
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cdev = kzalloc(sizeof(*cdev), GFP_KERNEL);
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if (!cdev)
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return -ENOMEM;
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cdev->offline = acpi_container_offline;
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dev = &cdev->dev;
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dev->bus = &container_subsys;
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dev_set_name(dev, "%s", dev_name(&adev->dev));
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ACPI_COMPANION_SET(dev, adev);
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dev->release = acpi_container_release;
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ret = device_register(dev);
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if (ret) {
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put_device(dev);
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return ret;
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}
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adev->driver_data = dev;
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return 1;
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}
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static void container_device_detach(struct acpi_device *adev)
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{
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struct device *dev = acpi_driver_data(adev);
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adev->driver_data = NULL;
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if (dev)
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device_unregister(dev);
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}
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static void container_device_online(struct acpi_device *adev)
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{
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struct device *dev = acpi_driver_data(adev);
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kobject_uevent(&dev->kobj, KOBJ_ONLINE);
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}
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static struct acpi_scan_handler container_handler = {
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.ids = container_device_ids,
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.attach = container_device_attach,
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.detach = container_device_detach,
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.hotplug = {
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.enabled = true,
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.demand_offline = true,
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.notify_online = container_device_online,
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},
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};
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void __init acpi_container_init(void)
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{
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acpi_scan_add_handler(&container_handler);
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}
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#else
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static struct acpi_scan_handler container_handler = {
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.ids = container_device_ids,
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};
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void __init acpi_container_init(void)
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{
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acpi_scan_add_handler_with_hotplug(&container_handler, "container");
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}
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#endif /* CONFIG_ACPI_CONTAINER */
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