[mirror_ubuntu-hirsute-kernel.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"

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
1ba90e3a TR	17	static const struct acpi_device_id container_device_ids[] = {
	18	{"ACPI0004", 0},
	19	{"PNP0A05", 0},
	20	{"PNP0A06", 0},
	21	{"", 0},
	22	};
1ba90e3a	23
a1ec6572 RW	24	#ifdef CONFIG_ACPI_CONTAINER
a1ec6572 RW	25
caa73ea1 RW	26	static int acpi_container_offline(struct container_dev *cdev)
	27	{
	28	struct acpi_device *adev = ACPI_COMPANION(&cdev->dev);
	29	struct acpi_device *child;
	30
	31	/* Check all of the dependent devices' physical companions. */
	32	list_for_each_entry(child, &adev->children, node)
	33	if (!acpi_scan_is_offline(child, false))
	34	return -EBUSY;
	35
	36	return 0;
	37	}
	38
	39	static void acpi_container_release(struct device *dev)
	40	{
	41	kfree(to_container_dev(dev));
	42	}
	43
46394fd0	44	static int container_device_attach(struct acpi_device *adev,
737f1a9f RW	45	const struct acpi_device_id *not_used)
737f1a9f RW	46	{
caa73ea1 RW	47	struct container_dev *cdev;
	48	struct device *dev;
	49	int ret;
	50
1e2380cd RW	51	if (adev->flags.is_dock_station)
	52	return 0;
	53
caa73ea1 RW	54	cdev = kzalloc(sizeof(*cdev), GFP_KERNEL);
	55	if (!cdev)
	56	return -ENOMEM;
	57
	58	cdev->offline = acpi_container_offline;
	59	dev = &cdev->dev;
	60	dev->bus = &container_subsys;
	61	dev_set_name(dev, "%s", dev_name(&adev->dev));
	62	ACPI_COMPANION_SET(dev, adev);
	63	dev->release = acpi_container_release;
	64	ret = device_register(dev);
0f6aa09e RW	65	if (ret) {
0f6aa09e RW	66	put_device(dev);
caa73ea1	67	return ret;
0f6aa09e	68	}
caa73ea1	69	adev->driver_data = dev;
737f1a9f RW	70	return 1;
	71	}
	72
46394fd0 RW	73	static void container_device_detach(struct acpi_device *adev)
46394fd0 RW	74	{
caa73ea1 RW	75	struct device *dev = acpi_driver_data(adev);
	76
	77	adev->driver_data = NULL;
	78	if (dev)
	79	device_unregister(dev);
46394fd0 RW	80	}
46394fd0 RW	81
8ab17fc9 RW	82	static void container_device_online(struct acpi_device *adev)
	83	{
	84	struct device *dev = acpi_driver_data(adev);
	85
	86	kobject_uevent(&dev->kobj, KOBJ_ONLINE);
	87	}
	88
79917f34	89	static struct acpi_scan_handler container_handler = {
1ba90e3a	90	.ids = container_device_ids,
737f1a9f	91	.attach = container_device_attach,
46394fd0	92	.detach = container_device_detach,
68a67f6c RW	93	.hotplug = {
68a67f6c RW	94	.enabled = true,
caa73ea1	95	.demand_offline = true,
8ab17fc9	96	.notify_online = container_device_online,
68a67f6c	97	},
1da177e4 LT	98	};
1da177e4 LT	99
a1ec6572 RW	100	void __init acpi_container_init(void)
	101	{
	102	acpi_scan_add_handler(&container_handler);
	103	}
	104
	105	#else
	106
	107	static struct acpi_scan_handler container_handler = {
	108	.ids = container_device_ids,
	109	};
	110
737f1a9f	111	void __init acpi_container_init(void)
1da177e4	112	{
79917f34	113	acpi_scan_add_handler_with_hotplug(&container_handler, "container");
1da177e4	114	}
a1ec6572 RW	115
a1ec6572 RW	116	#endif /* CONFIG_ACPI_CONTAINER */