[linux-2.6-block.git] / drivers / acpi / glue.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Link physical devices with ACPI devices support
 *
 * Copyright (c) 2005 David Shaohua Li <shaohua.li@intel.com>
 * Copyright (c) 2005 Intel Corp.
 */

#define pr_fmt(fmt) "ACPI: " fmt

#include <linux/acpi_iort.h>
#include <linux/export.h>
#include <linux/init.h>
#include <linux/list.h>
#include <linux/device.h>
#include <linux/slab.h>
#include <linux/rwsem.h>
#include <linux/acpi.h>
#include <linux/dma-mapping.h>
#include <linux/pci.h>
#include <linux/pci-acpi.h>
#include <linux/platform_device.h>

#include "internal.h"

static LIST_HEAD(bus_type_list);
static DECLARE_RWSEM(bus_type_sem);

#define PHYSICAL_NODE_STRING "physical_node"
#define PHYSICAL_NODE_NAME_SIZE (sizeof(PHYSICAL_NODE_STRING) + 10)

int register_acpi_bus_type(struct acpi_bus_type *type)
{
	if (acpi_disabled)
		return -ENODEV;
	if (type && type->match && type->find_companion) {
		down_write(&bus_type_sem);
		list_add_tail(&type->list, &bus_type_list);
		up_write(&bus_type_sem);
		pr_info("bus type %s registered\n", type->name);
		return 0;
	}
	return -ENODEV;
}
EXPORT_SYMBOL_GPL(register_acpi_bus_type);

int unregister_acpi_bus_type(struct acpi_bus_type *type)
{
	if (acpi_disabled)
		return 0;
	if (type) {
		down_write(&bus_type_sem);
		list_del_init(&type->list);
		up_write(&bus_type_sem);
		pr_info("bus type %s unregistered\n", type->name);
		return 0;
	}
	return -ENODEV;
}
EXPORT_SYMBOL_GPL(unregister_acpi_bus_type);

static struct acpi_bus_type *acpi_get_bus_type(struct device *dev)
{
	struct acpi_bus_type *tmp, *ret = NULL;

	down_read(&bus_type_sem);
	list_for_each_entry(tmp, &bus_type_list, list) {
		if (tmp->match(dev)) {
			ret = tmp;
			break;
		}
	}
	up_read(&bus_type_sem);
	return ret;
}

#define FIND_CHILD_MIN_SCORE	1
#define FIND_CHILD_MID_SCORE	2
#define FIND_CHILD_MAX_SCORE	3

static int match_any(struct acpi_device *adev, void *not_used)
{
	return 1;
}

static bool acpi_dev_has_children(struct acpi_device *adev)
{
	return acpi_dev_for_each_child(adev, match_any, NULL) > 0;
}

static int find_child_checks(struct acpi_device *adev, bool check_children)
{
	unsigned long long sta;
	acpi_status status;

	if (check_children && !acpi_dev_has_children(adev))
		return -ENODEV;

	status = acpi_evaluate_integer(adev->handle, "_STA", NULL, &sta);
	if (status == AE_NOT_FOUND) {
		/*
		 * Special case: backlight device objects without _STA are
		 * preferred to other objects with the same _ADR value, because
		 * it is more likely that they are actually useful.
		 */
		if (adev->pnp.type.backlight)
			return FIND_CHILD_MID_SCORE;

		return FIND_CHILD_MIN_SCORE;
	}

	if (ACPI_FAILURE(status) || !(sta & ACPI_STA_DEVICE_ENABLED))
		return -ENODEV;

	/*
	 * If the device has a _HID returning a valid ACPI/PNP device ID, it is
	 * better to make it look less attractive here, so that the other device
	 * with the same _ADR value (that may not have a valid device ID) can be
	 * matched going forward.  [This means a second spec violation in a row,
	 * so whatever we do here is best effort anyway.]
	 */
	if (adev->pnp.type.platform_id)
		return FIND_CHILD_MIN_SCORE;

	return FIND_CHILD_MAX_SCORE;
}

struct find_child_walk_data {
	struct acpi_device *adev;
	u64 address;
	int score;
	bool check_sta;
	bool check_children;
};

static int check_one_child(struct acpi_device *adev, void *data)
{
	struct find_child_walk_data *wd = data;
	int score;

	if (!adev->pnp.type.bus_address || acpi_device_adr(adev) != wd->address)
		return 0;

	if (!wd->adev) {
		/*
		 * This is the first matching object, so save it.  If it is not
		 * necessary to look for any other matching objects, stop the
		 * search.
		 */
		wd->adev = adev;
		return !(wd->check_sta || wd->check_children);
	}

	/*
	 * There is more than one matching device object with the same _ADR
	 * value.  That really is unexpected, so we are kind of beyond the scope
	 * of the spec here.  We have to choose which one to return, though.
	 *
	 * First, get the score for the previously found object and terminate
	 * the walk if it is maximum.
	*/
	if (!wd->score) {
		score = find_child_checks(wd->adev, wd->check_children);
		if (score == FIND_CHILD_MAX_SCORE)
			return 1;

		wd->score = score;
	}
	/*
	 * Second, if the object that has just been found has a better score,
	 * replace the previously found one with it and terminate the walk if
	 * the new score is maximum.
	 */
	score = find_child_checks(adev, wd->check_children);
	if (score > wd->score) {
		wd->adev = adev;
		if (score == FIND_CHILD_MAX_SCORE)
			return 1;

		wd->score = score;
	}

	/* Continue, because there may be better matches. */
	return 0;
}

static struct acpi_device *acpi_find_child(struct acpi_device *parent,
					   u64 address, bool check_children,
					   bool check_sta)
{
	struct find_child_walk_data wd = {
		.address = address,
		.check_children = check_children,
		.check_sta = check_sta,
		.adev = NULL,
		.score = 0,
	};

	if (parent)
		acpi_dev_for_each_child(parent, check_one_child, &wd);

	return wd.adev;
}

struct acpi_device *acpi_find_child_device(struct acpi_device *parent,
					   u64 address, bool check_children)
{
	return acpi_find_child(parent, address, check_children, true);
}
EXPORT_SYMBOL_GPL(acpi_find_child_device);

struct acpi_device *acpi_find_child_by_adr(struct acpi_device *adev,
					   acpi_bus_address adr)
{
	return acpi_find_child(adev, adr, false, false);
}
EXPORT_SYMBOL_GPL(acpi_find_child_by_adr);

static void acpi_physnode_link_name(char *buf, unsigned int node_id)
{
	if (node_id > 0)
		snprintf(buf, PHYSICAL_NODE_NAME_SIZE,
			 PHYSICAL_NODE_STRING "%u", node_id);
	else
		strcpy(buf, PHYSICAL_NODE_STRING);
}

int acpi_bind_one(struct device *dev, struct acpi_device *acpi_dev)
{
	struct acpi_device_physical_node *physical_node, *pn;
	char physical_node_name[PHYSICAL_NODE_NAME_SIZE];
	struct list_head *physnode_list;
	unsigned int node_id;
	int retval = -EINVAL;

	if (has_acpi_companion(dev)) {
		if (acpi_dev) {
			dev_warn(dev, "ACPI companion already set\n");
			return -EINVAL;
		} else {
			acpi_dev = ACPI_COMPANION(dev);
		}
	}
	if (!acpi_dev)
		return -EINVAL;

	acpi_dev_get(acpi_dev);
	get_device(dev);
	physical_node = kzalloc(sizeof(*physical_node), GFP_KERNEL);
	if (!physical_node) {
		retval = -ENOMEM;
		goto err;
	}

	mutex_lock(&acpi_dev->physical_node_lock);

	/*
	 * Keep the list sorted by node_id so that the IDs of removed nodes can
	 * be recycled easily.
	 */
	physnode_list = &acpi_dev->physical_node_list;
	node_id = 0;
	list_for_each_entry(pn, &acpi_dev->physical_node_list, node) {
		/* Sanity check. */
		if (pn->dev == dev) {
			mutex_unlock(&acpi_dev->physical_node_lock);

			dev_warn(dev, "Already associated with ACPI node\n");
			kfree(physical_node);
			if (ACPI_COMPANION(dev) != acpi_dev)
				goto err;

			put_device(dev);
			acpi_dev_put(acpi_dev);
			return 0;
		}
		if (pn->node_id == node_id) {
			physnode_list = &pn->node;
			node_id++;
		}
	}

	physical_node->node_id = node_id;
	physical_node->dev = dev;
	list_add(&physical_node->node, physnode_list);
	acpi_dev->physical_node_count++;

	if (!has_acpi_companion(dev))
		ACPI_COMPANION_SET(dev, acpi_dev);

	acpi_physnode_link_name(physical_node_name, node_id);
	retval = sysfs_create_link(&acpi_dev->dev.kobj, &dev->kobj,
				   physical_node_name);
	if (retval)
		dev_err(&acpi_dev->dev, "Failed to create link %s (%d)\n",
			physical_node_name, retval);

	retval = sysfs_create_link(&dev->kobj, &acpi_dev->dev.kobj,
				   "firmware_node");
	if (retval)
		dev_err(dev, "Failed to create link firmware_node (%d)\n",
			retval);

	mutex_unlock(&acpi_dev->physical_node_lock);

	if (acpi_dev->wakeup.flags.valid)
		device_set_wakeup_capable(dev, true);

	return 0;

 err:
	ACPI_COMPANION_SET(dev, NULL);
	put_device(dev);
	acpi_dev_put(acpi_dev);
	return retval;
}
EXPORT_SYMBOL_GPL(acpi_bind_one);

int acpi_unbind_one(struct device *dev)
{
	struct acpi_device *acpi_dev = ACPI_COMPANION(dev);
	struct acpi_device_physical_node *entry;

	if (!acpi_dev)
		return 0;

	mutex_lock(&acpi_dev->physical_node_lock);

	list_for_each_entry(entry, &acpi_dev->physical_node_list, node)
		if (entry->dev == dev) {
			char physnode_name[PHYSICAL_NODE_NAME_SIZE];

			list_del(&entry->node);
			acpi_dev->physical_node_count--;

			acpi_physnode_link_name(physnode_name, entry->node_id);
			sysfs_remove_link(&acpi_dev->dev.kobj, physnode_name);
			sysfs_remove_link(&dev->kobj, "firmware_node");
			ACPI_COMPANION_SET(dev, NULL);
			/* Drop references taken by acpi_bind_one(). */
			put_device(dev);
			acpi_dev_put(acpi_dev);
			kfree(entry);
			break;
		}

	mutex_unlock(&acpi_dev->physical_node_lock);
	return 0;
}
EXPORT_SYMBOL_GPL(acpi_unbind_one);

void acpi_device_notify(struct device *dev)
{
	struct acpi_device *adev;
	int ret;

	ret = acpi_bind_one(dev, NULL);
	if (ret) {
		struct acpi_bus_type *type = acpi_get_bus_type(dev);

		if (!type)
			goto err;

		adev = type->find_companion(dev);
		if (!adev) {
			dev_dbg(dev, "ACPI companion not found\n");
			goto err;
		}
		ret = acpi_bind_one(dev, adev);
		if (ret)
			goto err;

		if (type->setup) {
			type->setup(dev);
			goto done;
		}
	} else {
		adev = ACPI_COMPANION(dev);

		if (dev_is_pci(dev)) {
			pci_acpi_setup(dev, adev);
			goto done;
		} else if (dev_is_platform(dev)) {
			acpi_configure_pmsi_domain(dev);
		}
	}

	if (adev->handler && adev->handler->bind)
		adev->handler->bind(dev);

done:
	acpi_handle_debug(ACPI_HANDLE(dev), "Bound to device %s\n",
			  dev_name(dev));

	return;

err:
	dev_dbg(dev, "No ACPI support\n");
}

void acpi_device_notify_remove(struct device *dev)
{
	struct acpi_device *adev = ACPI_COMPANION(dev);

	if (!adev)
		return;

	if (dev_is_pci(dev))
		pci_acpi_cleanup(dev, adev);
	else if (adev->handler && adev->handler->unbind)
		adev->handler->unbind(dev);

	acpi_unbind_one(dev);
}
Commit	Line	Data
55716d26	1	// SPDX-License-Identifier: GPL-2.0-only
4e10d12a DSL	2	/*
	3	* Link physical devices with ACPI devices support
	4	*
	5	* Copyright (c) 2005 David Shaohua Li <shaohua.li@intel.com>
	6	* Copyright (c) 2005 Intel Corp.
4e10d12a	7	*/
d4f54a18	8
e2935abb HG	9	#define pr_fmt(fmt) "ACPI: " fmt
e2935abb HG	10
d4f54a18	11	#include <linux/acpi_iort.h>
214f2c90	12	#include <linux/export.h>
4e10d12a DSL	13	#include <linux/init.h>
	14	#include <linux/list.h>
	15	#include <linux/device.h>
5a0e3ad6	16	#include <linux/slab.h>
4e10d12a DSL	17	#include <linux/rwsem.h>
4e10d12a DSL	18	#include <linux/acpi.h>
d0562674	19	#include <linux/dma-mapping.h>
47954481 RW	20	#include <linux/pci.h>
47954481 RW	21	#include <linux/pci-acpi.h>
d4f54a18	22	#include <linux/platform_device.h>
4e10d12a	23
a192a958 LB	24	#include "internal.h"
a192a958 LB	25
4e10d12a DSL	26	static LIST_HEAD(bus_type_list);
	27	static DECLARE_RWSEM(bus_type_sem);
	28
1033f904	29	#define PHYSICAL_NODE_STRING "physical_node"
007ccfcf	30	#define PHYSICAL_NODE_NAME_SIZE (sizeof(PHYSICAL_NODE_STRING) + 10)
1033f904	31
4e10d12a DSL	32	int register_acpi_bus_type(struct acpi_bus_type *type)
	33	{
	34	if (acpi_disabled)
	35	return -ENODEV;
e3f02c52	36	if (type && type->match && type->find_companion) {
4e10d12a DSL	37	down_write(&bus_type_sem);
	38	list_add_tail(&type->list, &bus_type_list);
	39	up_write(&bus_type_sem);
e2935abb	40	pr_info("bus type %s registered\n", type->name);
4e10d12a DSL	41	return 0;
	42	}
	43	return -ENODEV;
	44	}
91e4d5a1	45	EXPORT_SYMBOL_GPL(register_acpi_bus_type);
4e10d12a	46
4e10d12a DSL	47	int unregister_acpi_bus_type(struct acpi_bus_type *type)
	48	{
	49	if (acpi_disabled)
	50	return 0;
	51	if (type) {
	52	down_write(&bus_type_sem);
	53	list_del_init(&type->list);
	54	up_write(&bus_type_sem);
e2935abb	55	pr_info("bus type %s unregistered\n", type->name);
4e10d12a DSL	56	return 0;
	57	}
	58	return -ENODEV;
	59	}
91e4d5a1	60	EXPORT_SYMBOL_GPL(unregister_acpi_bus_type);
4e10d12a	61
53540098	62	static struct acpi_bus_type acpi_get_bus_type(struct device dev)
4e10d12a DSL	63	{
	64	struct acpi_bus_type tmp, ret = NULL;
	65
	66	down_read(&bus_type_sem);
	67	list_for_each_entry(tmp, &bus_type_list, list) {
53540098	68	if (tmp->match(dev)) {
4e10d12a DSL	69	ret = tmp;
	70	break;
	71	}
	72	}
	73	up_read(&bus_type_sem);
	74	return ret;
	75	}
	76
11b88ee2	77	#define FIND_CHILD_MIN_SCORE 1
f64e4275 HG	78	#define FIND_CHILD_MID_SCORE 2
f64e4275 HG	79	#define FIND_CHILD_MAX_SCORE 3
11b88ee2	80
f5122be8 RW	81	static int match_any(struct acpi_device adev, void not_used)
	82	{
	83	return 1;
	84	}
	85
	86	static bool acpi_dev_has_children(struct acpi_device *adev)
	87	{
	88	return acpi_dev_for_each_child(adev, match_any, NULL) > 0;
	89	}
	90
d9fef0c4	91	static int find_child_checks(struct acpi_device *adev, bool check_children)
60f75b8e RW	92	{
	93	unsigned long long sta;
	94	acpi_status status;
	95
f5122be8	96	if (check_children && !acpi_dev_has_children(adev))
b7fbf4ce RW	97	return -ENODEV;
b7fbf4ce RW	98
d9fef0c4	99	status = acpi_evaluate_integer(adev->handle, "_STA", NULL, &sta);
f64e4275 HG	100	if (status == AE_NOT_FOUND) {
	101	/*
	102	* Special case: backlight device objects without _STA are
	103	* preferred to other objects with the same _ADR value, because
	104	* it is more likely that they are actually useful.
	105	*/
	106	if (adev->pnp.type.backlight)
	107	return FIND_CHILD_MID_SCORE;
	108
b7fbf4ce	109	return FIND_CHILD_MIN_SCORE;
f64e4275	110	}
60f75b8e	111
b7fbf4ce	112	if (ACPI_FAILURE(status) \|\| !(sta & ACPI_STA_DEVICE_ENABLED))
d9fef0c4	113	return -ENODEV;
60f75b8e	114
c2a6bbaf	115	/*
fdad4e7a RW	116	* If the device has a _HID returning a valid ACPI/PNP device ID, it is
	117	* better to make it look less attractive here, so that the other device
	118	* with the same _ADR value (that may not have a valid device ID) can be
	119	* matched going forward. [This means a second spec violation in a row,
	120	* so whatever we do here is best effort anyway.]
c2a6bbaf	121	*/
b7fbf4ce RW	122	if (adev->pnp.type.platform_id)
	123	return FIND_CHILD_MIN_SCORE;
	124
	125	return FIND_CHILD_MAX_SCORE;
60f75b8e RW	126	}
60f75b8e RW	127
d21b5700 RW	128	struct find_child_walk_data {
	129	struct acpi_device *adev;
	130	u64 address;
	131	int score;
2f6fe93f	132	bool check_sta;
d21b5700 RW	133	bool check_children;
	134	};
	135
	136	static int check_one_child(struct acpi_device adev, void data)
60f75b8e	137	{
d21b5700 RW	138	struct find_child_walk_data *wd = data;
d21b5700 RW	139	int score;
d9fef0c4	140
d21b5700 RW	141	if (!adev->pnp.type.bus_address \|\| acpi_device_adr(adev) != wd->address)
d21b5700 RW	142	return 0;
5ce79d20	143
d21b5700	144	if (!wd->adev) {
2f6fe93f RW	145	/*
	146	* This is the first matching object, so save it. If it is not
	147	* necessary to look for any other matching objects, stop the
	148	* search.
	149	*/
d21b5700	150	wd->adev = adev;
2f6fe93f	151	return !(wd->check_sta \|\| wd->check_children);
d21b5700	152	}
d9fef0c4	153
d21b5700 RW	154	/*
	155	* There is more than one matching device object with the same _ADR
	156	* value. That really is unexpected, so we are kind of beyond the scope
	157	* of the spec here. We have to choose which one to return, though.
	158	*
	159	* First, get the score for the previously found object and terminate
	160	* the walk if it is maximum.
	161	*/
	162	if (!wd->score) {
	163	score = find_child_checks(wd->adev, wd->check_children);
	164	if (score == FIND_CHILD_MAX_SCORE)
	165	return 1;
	166
	167	wd->score = score;
	168	}
	169	/*
	170	* Second, if the object that has just been found has a better score,
	171	* replace the previously found one with it and terminate the walk if
	172	* the new score is maximum.
	173	*/
	174	score = find_child_checks(adev, wd->check_children);
	175	if (score > wd->score) {
	176	wd->adev = adev;
	177	if (score == FIND_CHILD_MAX_SCORE)
	178	return 1;
d9fef0c4	179
d21b5700	180	wd->score = score;
4e10d12a	181	}
d21b5700 RW	182
	183	/* Continue, because there may be better matches. */
	184	return 0;
	185	}
	186
2f6fe93f RW	187	static struct acpi_device acpi_find_child(struct acpi_device parent,
	188	u64 address, bool check_children,
	189	bool check_sta)
d21b5700 RW	190	{
	191	struct find_child_walk_data wd = {
	192	.address = address,
	193	.check_children = check_children,
2f6fe93f	194	.check_sta = check_sta,
d21b5700 RW	195	.adev = NULL,
	196	.score = 0,
	197	};
	198
	199	if (parent)
	200	acpi_dev_for_each_child(parent, check_one_child, &wd);
	201
	202	return wd.adev;
4e10d12a	203	}
2f6fe93f RW	204
	205	struct acpi_device acpi_find_child_device(struct acpi_device parent,
	206	u64 address, bool check_children)
	207	{
	208	return acpi_find_child(parent, address, check_children, true);
	209	}
9c5ad36d	210	EXPORT_SYMBOL_GPL(acpi_find_child_device);
4e10d12a	211
2f6fe93f RW	212	struct acpi_device acpi_find_child_by_adr(struct acpi_device adev,
	213	acpi_bus_address adr)
	214	{
	215	return acpi_find_child(adev, adr, false, false);
	216	}
	217	EXPORT_SYMBOL_GPL(acpi_find_child_by_adr);
	218
bdbdbf91 RW	219	static void acpi_physnode_link_name(char *buf, unsigned int node_id)
	220	{
	221	if (node_id > 0)
	222	snprintf(buf, PHYSICAL_NODE_NAME_SIZE,
	223	PHYSICAL_NODE_STRING "%u", node_id);
	224	else
	225	strcpy(buf, PHYSICAL_NODE_STRING);
	226	}
	227
24dee1fc	228	int acpi_bind_one(struct device dev, struct acpi_device acpi_dev)
4e10d12a	229	{
f3fd0c8a	230	struct acpi_device_physical_node physical_node, pn;
007ccfcf RW	231	char physical_node_name[PHYSICAL_NODE_NAME_SIZE];
	232	struct list_head *physnode_list;
	233	unsigned int node_id;
1033f904	234	int retval = -EINVAL;
4e10d12a	235
ca5b74d2	236	if (has_acpi_companion(dev)) {
24dee1fc	237	if (acpi_dev) {
7b199811	238	dev_warn(dev, "ACPI companion already set\n");
f3fd0c8a RW	239	return -EINVAL;
f3fd0c8a RW	240	} else {
7b199811	241	acpi_dev = ACPI_COMPANION(dev);
f3fd0c8a	242	}
4e10d12a	243	}
7b199811	244	if (!acpi_dev)
f3fd0c8a	245	return -EINVAL;
1033f904	246
4cbaba4e	247	acpi_dev_get(acpi_dev);
4e10d12a	248	get_device(dev);
f3fd0c8a	249	physical_node = kzalloc(sizeof(*physical_node), GFP_KERNEL);
1033f904 LT	250	if (!physical_node) {
	251	retval = -ENOMEM;
	252	goto err;
4e10d12a	253	}
4e10d12a	254
1033f904	255	mutex_lock(&acpi_dev->physical_node_lock);
f3fd0c8a	256
007ccfcf RW	257	/*
	258	* Keep the list sorted by node_id so that the IDs of removed nodes can
	259	* be recycled easily.
	260	*/
	261	physnode_list = &acpi_dev->physical_node_list;
	262	node_id = 0;
	263	list_for_each_entry(pn, &acpi_dev->physical_node_list, node) {
	264	/* Sanity check. */
f3fd0c8a	265	if (pn->dev == dev) {
3342c753 RW	266	mutex_unlock(&acpi_dev->physical_node_lock);
3342c753 RW	267
f3fd0c8a	268	dev_warn(dev, "Already associated with ACPI node\n");
3342c753	269	kfree(physical_node);
7b199811	270	if (ACPI_COMPANION(dev) != acpi_dev)
3342c753	271	goto err;
3fe444ad	272
3342c753	273	put_device(dev);
4cbaba4e	274	acpi_dev_put(acpi_dev);
3342c753	275	return 0;
f3fd0c8a	276	}
007ccfcf RW	277	if (pn->node_id == node_id) {
	278	physnode_list = &pn->node;
	279	node_id++;
	280	}
1071695f DB	281	}
1071695f DB	282
007ccfcf	283	physical_node->node_id = node_id;
1033f904	284	physical_node->dev = dev;
007ccfcf	285	list_add(&physical_node->node, physnode_list);
1033f904	286	acpi_dev->physical_node_count++;
f3fd0c8a	287
ca5b74d2	288	if (!has_acpi_companion(dev))
7b199811	289	ACPI_COMPANION_SET(dev, acpi_dev);
1033f904	290
bdbdbf91	291	acpi_physnode_link_name(physical_node_name, node_id);
1033f904	292	retval = sysfs_create_link(&acpi_dev->dev.kobj, &dev->kobj,
f501b6ec	293	physical_node_name);
464c1147 RW	294	if (retval)
	295	dev_err(&acpi_dev->dev, "Failed to create link %s (%d)\n",
	296	physical_node_name, retval);
	297
1033f904	298	retval = sysfs_create_link(&dev->kobj, &acpi_dev->dev.kobj,
f501b6ec	299	"firmware_node");
464c1147 RW	300	if (retval)
	301	dev_err(dev, "Failed to create link firmware_node (%d)\n",
	302	retval);
1033f904	303
40055206 RW	304	mutex_unlock(&acpi_dev->physical_node_lock);
40055206 RW	305
1033f904 LT	306	if (acpi_dev->wakeup.flags.valid)
	307	device_set_wakeup_capable(dev, true);
	308
4e10d12a	309	return 0;
1033f904 LT	310
1033f904 LT	311	err:
7b199811	312	ACPI_COMPANION_SET(dev, NULL);
1033f904	313	put_device(dev);
4cbaba4e	314	acpi_dev_put(acpi_dev);
1033f904	315	return retval;
4e10d12a	316	}
ac212b69	317	EXPORT_SYMBOL_GPL(acpi_bind_one);
4e10d12a	318
ac212b69	319	int acpi_unbind_one(struct device *dev)
4e10d12a	320	{
7b199811	321	struct acpi_device *acpi_dev = ACPI_COMPANION(dev);
1033f904	322	struct acpi_device_physical_node *entry;
1033f904	323
7b199811	324	if (!acpi_dev)
4e10d12a	325	return 0;
1071695f	326
1033f904	327	mutex_lock(&acpi_dev->physical_node_lock);
3e332783 RW	328
	329	list_for_each_entry(entry, &acpi_dev->physical_node_list, node)
	330	if (entry->dev == dev) {
	331	char physnode_name[PHYSICAL_NODE_NAME_SIZE];
	332
	333	list_del(&entry->node);
	334	acpi_dev->physical_node_count--;
	335
	336	acpi_physnode_link_name(physnode_name, entry->node_id);
	337	sysfs_remove_link(&acpi_dev->dev.kobj, physnode_name);
	338	sysfs_remove_link(&dev->kobj, "firmware_node");
7b199811	339	ACPI_COMPANION_SET(dev, NULL);
a104b4d4	340	/* Drop references taken by acpi_bind_one(). */
3e332783	341	put_device(dev);
4cbaba4e	342	acpi_dev_put(acpi_dev);
3e332783 RW	343	kfree(entry);
	344	break;
	345	}
	346
1033f904	347	mutex_unlock(&acpi_dev->physical_node_lock);
4e10d12a DSL	348	return 0;
4e10d12a DSL	349	}
ac212b69	350	EXPORT_SYMBOL_GPL(acpi_unbind_one);
4e10d12a	351
d0b8e398	352	void acpi_device_notify(struct device *dev)
4e10d12a	353	{
9cb32acf	354	struct acpi_device *adev;
11909ca1	355	int ret;
4e10d12a	356
f3fd0c8a	357	ret = acpi_bind_one(dev, NULL);
42878a9f	358	if (ret) {
2ef52366 RW	359	struct acpi_bus_type *type = acpi_get_bus_type(dev);
2ef52366 RW	360
42878a9f RW	361	if (!type)
42878a9f RW	362	goto err;
e3f02c52 RW	363
	364	adev = type->find_companion(dev);
	365	if (!adev) {
42878a9f	366	dev_dbg(dev, "ACPI companion not found\n");
42878a9f	367	goto err;
11909ca1	368	}
24dee1fc	369	ret = acpi_bind_one(dev, adev);
11909ca1	370	if (ret)
42878a9f	371	goto err;
11909ca1	372
2ef52366 RW	373	if (type->setup) {
	374	type->setup(dev);
	375	goto done;
	376	}
47954481	377	} else {
2ef52366	378	adev = ACPI_COMPANION(dev);
d4f54a18	379
2ef52366 RW	380	if (dev_is_pci(dev)) {
	381	pci_acpi_setup(dev, adev);
	382	goto done;
	383	} else if (dev_is_platform(dev)) {
	384	acpi_configure_pmsi_domain(dev);
	385	}
47954481	386	}
d4f54a18	387
2ef52366	388	if (adev->handler && adev->handler->bind)
9cb32acf	389	adev->handler->bind(dev);
4e10d12a	390
2ef52366	391	done:
42878a9f RW	392	acpi_handle_debug(ACPI_HANDLE(dev), "Bound to device %s\n",
42878a9f RW	393	dev_name(dev));
4e10d12a	394
7d625e5b	395	return;
42878a9f RW	396
	397	err:
	398	dev_dbg(dev, "No ACPI support\n");
4e10d12a DSL	399	}
4e10d12a DSL	400
d0b8e398	401	void acpi_device_notify_remove(struct device *dev)
4e10d12a	402	{
9cb32acf	403	struct acpi_device *adev = ACPI_COMPANION(dev);
11909ca1	404
9cb32acf	405	if (!adev)
7d625e5b	406	return;
9cb32acf	407
c4d19838	408	if (dev_is_pci(dev))
47954481	409	pci_acpi_cleanup(dev, adev);
9cb32acf RW	410	else if (adev->handler && adev->handler->unbind)
9cb32acf RW	411	adev->handler->unbind(dev);
11909ca1	412
4e10d12a	413	acpi_unbind_one(dev);
4e10d12a	414	}