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/*
* 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.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
*
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
*/
#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},
};
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;
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 struct acpi_scan_handler container_handler = {
.ids = container_device_ids,
.attach = container_device_attach,
.detach = container_device_detach,
.hotplug = {
.enabled = true,
.demand_offline = true,
},
};
void __init acpi_container_init(void)
{
acpi_scan_add_handler_with_hotplug(&container_handler, "container");
}
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