[thirdparty/kernel/stable.git] / drivers / acpi / container.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * 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>
 */
#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 */
Commit	Line	Data
c942fddf	1	// SPDX-License-Identifier: GPL-2.0-or-later
1da177e4	2	/*
68a67f6c	3	* container.c - ACPI Generic Container Driver
1da177e4 LT	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)
1da177e4	8	* Copyright (C) 2004 FUJITSU LIMITED
68a67f6c RW	9	* Copyright (C) 2004, 2013 Intel Corp.
68a67f6c RW	10	* Author: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
1da177e4	11	*/
1da177e4	12	#include <linux/acpi.h>
caa73ea1	13	#include <linux/container.h>
1da177e4	14
2f9b06fc AS	15	#include "internal.h"
2f9b06fc AS	16
1da177e4	17	#define _COMPONENT ACPI_CONTAINER_COMPONENT
f52fd66d	18	ACPI_MODULE_NAME("container");
1da177e4	19
1ba90e3a TR	20	static const struct acpi_device_id container_device_ids[] = {
	21	{"ACPI0004", 0},
	22	{"PNP0A05", 0},
	23	{"PNP0A06", 0},
	24	{"", 0},
	25	};
1ba90e3a	26
a1ec6572 RW	27	#ifdef CONFIG_ACPI_CONTAINER
a1ec6572 RW	28
caa73ea1 RW	29	static int acpi_container_offline(struct container_dev *cdev)
	30	{
	31	struct acpi_device *adev = ACPI_COMPANION(&cdev->dev);
	32	struct acpi_device *child;
	33
	34	/* Check all of the dependent devices' physical companions. */
	35	list_for_each_entry(child, &adev->children, node)
	36	if (!acpi_scan_is_offline(child, false))
	37	return -EBUSY;
	38
	39	return 0;
	40	}
	41
	42	static void acpi_container_release(struct device *dev)
	43	{
	44	kfree(to_container_dev(dev));
	45	}
	46
46394fd0	47	static int container_device_attach(struct acpi_device *adev,
737f1a9f RW	48	const struct acpi_device_id *not_used)
737f1a9f RW	49	{
caa73ea1 RW	50	struct container_dev *cdev;
	51	struct device *dev;
	52	int ret;
	53
1e2380cd RW	54	if (adev->flags.is_dock_station)
	55	return 0;
	56
caa73ea1 RW	57	cdev = kzalloc(sizeof(*cdev), GFP_KERNEL);
	58	if (!cdev)
	59	return -ENOMEM;
	60
	61	cdev->offline = acpi_container_offline;
	62	dev = &cdev->dev;
	63	dev->bus = &container_subsys;
	64	dev_set_name(dev, "%s", dev_name(&adev->dev));
	65	ACPI_COMPANION_SET(dev, adev);
	66	dev->release = acpi_container_release;
	67	ret = device_register(dev);
0f6aa09e RW	68	if (ret) {
0f6aa09e RW	69	put_device(dev);
caa73ea1	70	return ret;
0f6aa09e	71	}
caa73ea1	72	adev->driver_data = dev;
737f1a9f RW	73	return 1;
	74	}
	75
46394fd0 RW	76	static void container_device_detach(struct acpi_device *adev)
46394fd0 RW	77	{
caa73ea1 RW	78	struct device *dev = acpi_driver_data(adev);
	79
	80	adev->driver_data = NULL;
	81	if (dev)
	82	device_unregister(dev);
46394fd0 RW	83	}
46394fd0 RW	84
8ab17fc9 RW	85	static void container_device_online(struct acpi_device *adev)
	86	{
	87	struct device *dev = acpi_driver_data(adev);
	88
	89	kobject_uevent(&dev->kobj, KOBJ_ONLINE);
	90	}
	91
79917f34	92	static struct acpi_scan_handler container_handler = {
1ba90e3a	93	.ids = container_device_ids,
737f1a9f	94	.attach = container_device_attach,
46394fd0	95	.detach = container_device_detach,
68a67f6c RW	96	.hotplug = {
68a67f6c RW	97	.enabled = true,
caa73ea1	98	.demand_offline = true,
8ab17fc9	99	.notify_online = container_device_online,
68a67f6c	100	},
1da177e4 LT	101	};
1da177e4 LT	102
a1ec6572 RW	103	void __init acpi_container_init(void)
	104	{
	105	acpi_scan_add_handler(&container_handler);
	106	}
	107
	108	#else
	109
	110	static struct acpi_scan_handler container_handler = {
	111	.ids = container_device_ids,
	112	};
	113
737f1a9f	114	void __init acpi_container_init(void)
1da177e4	115	{
79917f34	116	acpi_scan_add_handler_with_hotplug(&container_handler, "container");
1da177e4	117	}
a1ec6572 RW	118
a1ec6572 RW	119	#endif /* CONFIG_ACPI_CONTAINER */