[mirror_ubuntu-bionic-kernel.git] / drivers / acpi / glue.c

/*
 * Link physical devices with ACPI devices support
 *
 * Copyright (c) 2005 David Shaohua Li <shaohua.li@intel.com>
 * Copyright (c) 2005 Intel Corp.
 *
 * This file is released under the GPLv2.
 */
#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 "internal.h"

#define ACPI_GLUE_DEBUG	0
#if ACPI_GLUE_DEBUG
#define DBG(fmt, ...)						\
	printk(KERN_DEBUG PREFIX fmt, ##__VA_ARGS__)
#else
#define DBG(fmt, ...)						\
do {								\
	if (0)							\
		printk(KERN_DEBUG PREFIX fmt, ##__VA_ARGS__);	\
} while (0)
#endif
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_device) {
		down_write(&bus_type_sem);
		list_add_tail(&type->list, &bus_type_list);
		up_write(&bus_type_sem);
		printk(KERN_INFO PREFIX "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);
		printk(KERN_INFO PREFIX "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_MAX_SCORE	2

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

	status = acpi_evaluate_integer(adev->handle, "_STA", NULL, &sta);
	if (status == AE_NOT_FOUND)
		sta_present = false;
	else if (ACPI_FAILURE(status) || !(sta & ACPI_STA_DEVICE_ENABLED))
		return -ENODEV;

	if (check_children && list_empty(&adev->children))
		return -ENODEV;

	return sta_present ? FIND_CHILD_MAX_SCORE : FIND_CHILD_MIN_SCORE;
}

struct acpi_device *acpi_find_child_device(struct acpi_device *parent,
					   u64 address, bool check_children)
{
	struct acpi_device *adev, *ret = NULL;
	int ret_score = 0;

	list_for_each_entry(adev, &parent->children, node) {
		unsigned long long addr;
		acpi_status status;
		int score;

		status = acpi_evaluate_integer(adev->handle, METHOD_NAME__ADR,
					       NULL, &addr);
		if (ACPI_FAILURE(status) || addr != address)
			continue;

		if (!ret) {
			/* This is the first matching object.  Save it. */
			ret = adev;
			continue;
		}
		/*
		 * 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, check if the previously found object is good enough
		 * and return it if so.  Second, do the same for the object that
		 * we've just found.
		 */
		if (!ret_score) {
			ret_score = find_child_checks(ret, check_children);
			if (ret_score == FIND_CHILD_MAX_SCORE)
				return ret;
		}
		score = find_child_checks(adev, check_children);
		if (score == FIND_CHILD_MAX_SCORE) {
			return adev;
		} else if (score > ret_score) {
			ret = adev;
			ret_score = score;
		}
	}
	return ret;
}

acpi_handle acpi_find_child(acpi_handle handle, u64 addr, bool is_bridge)
{
	struct acpi_device *adev;

	if (!handle || acpi_bus_get_device(handle, &adev))
		return NULL;

	adev = acpi_find_child_device(adev, addr, is_bridge);
	return adev ? adev->handle : NULL;
}
EXPORT_SYMBOL_GPL(acpi_find_child);

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, acpi_handle handle)
{
	struct acpi_device *acpi_dev = NULL;
	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 (ACPI_COMPANION(dev)) {
		if (handle) {
			dev_warn(dev, "ACPI companion already set\n");
			return -EINVAL;
		} else {
			acpi_dev = ACPI_COMPANION(dev);
		}
	} else {
		acpi_bus_get_device(handle, &acpi_dev);
	}
	if (!acpi_dev)
		return -EINVAL;

	get_device(&acpi_dev->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);
			put_device(&acpi_dev->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 (!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);
	put_device(&acpi_dev->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);
			put_device(&acpi_dev->dev);
			kfree(entry);
			break;
		}

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

void acpi_preset_companion(struct device *dev, acpi_handle parent, u64 addr)
{
	struct acpi_device *adev;

	if (!acpi_bus_get_device(acpi_get_child(parent, addr), &adev))
		ACPI_COMPANION_SET(dev, adev);
}
EXPORT_SYMBOL_GPL(acpi_preset_companion);

static int acpi_platform_notify(struct device *dev)
{
	struct acpi_bus_type *type = acpi_get_bus_type(dev);
	acpi_handle handle;
	int ret;

	ret = acpi_bind_one(dev, NULL);
	if (ret && type) {
		ret = type->find_device(dev, &handle);
		if (ret) {
			DBG("Unable to get handle for %s\n", dev_name(dev));
			goto out;
		}
		ret = acpi_bind_one(dev, handle);
		if (ret)
			goto out;
	}

	if (type && type->setup)
		type->setup(dev);

 out:
#if ACPI_GLUE_DEBUG
	if (!ret) {
		struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };

		acpi_get_name(ACPI_HANDLE(dev), ACPI_FULL_PATHNAME, &buffer);
		DBG("Device %s -> %s\n", dev_name(dev), (char *)buffer.pointer);
		kfree(buffer.pointer);
	} else
		DBG("Device %s -> No ACPI support\n", dev_name(dev));
#endif

	return ret;
}

static int acpi_platform_notify_remove(struct device *dev)
{
	struct acpi_bus_type *type;

	type = acpi_get_bus_type(dev);
	if (type && type->cleanup)
		type->cleanup(dev);

	acpi_unbind_one(dev);
	return 0;
}

int __init init_acpi_device_notify(void)
{
	if (platform_notify || platform_notify_remove) {
		printk(KERN_ERR PREFIX "Can't use platform_notify\n");
		return 0;
	}
	platform_notify = acpi_platform_notify;
	platform_notify_remove = acpi_platform_notify_remove;
	return 0;
}
Commit	Line	Data
4e10d12a DSL	1	/*
	2	* Link physical devices with ACPI devices support
	3	*
	4	* Copyright (c) 2005 David Shaohua Li <shaohua.li@intel.com>
	5	* Copyright (c) 2005 Intel Corp.
	6	*
	7	* This file is released under the GPLv2.
	8	*/
214f2c90	9	#include <linux/export.h>
4e10d12a DSL	10	#include <linux/init.h>
	11	#include <linux/list.h>
	12	#include <linux/device.h>
5a0e3ad6	13	#include <linux/slab.h>
4e10d12a DSL	14	#include <linux/rwsem.h>
	15	#include <linux/acpi.h>
	16
a192a958 LB	17	#include "internal.h"
a192a958 LB	18
4e10d12a DSL	19	#define ACPI_GLUE_DEBUG 0
4e10d12a DSL	20	#if ACPI_GLUE_DEBUG
23415eb5 JP	21	#define DBG(fmt, ...) \
23415eb5 JP	22	printk(KERN_DEBUG PREFIX fmt, ##__VA_ARGS__)
4e10d12a	23	#else
23415eb5 JP	24	#define DBG(fmt, ...) \
	25	do { \
	26	if (0) \
	27	printk(KERN_DEBUG PREFIX fmt, ##__VA_ARGS__); \
	28	} while (0)
4e10d12a DSL	29	#endif
	30	static LIST_HEAD(bus_type_list);
	31	static DECLARE_RWSEM(bus_type_sem);
	32
1033f904	33	#define PHYSICAL_NODE_STRING "physical_node"
007ccfcf	34	#define PHYSICAL_NODE_NAME_SIZE (sizeof(PHYSICAL_NODE_STRING) + 10)
1033f904	35
4e10d12a DSL	36	int register_acpi_bus_type(struct acpi_bus_type *type)
	37	{
	38	if (acpi_disabled)
	39	return -ENODEV;
53540098	40	if (type && type->match && type->find_device) {
4e10d12a DSL	41	down_write(&bus_type_sem);
	42	list_add_tail(&type->list, &bus_type_list);
	43	up_write(&bus_type_sem);
53540098	44	printk(KERN_INFO PREFIX "bus type %s registered\n", type->name);
4e10d12a DSL	45	return 0;
	46	}
	47	return -ENODEV;
	48	}
91e4d5a1	49	EXPORT_SYMBOL_GPL(register_acpi_bus_type);
4e10d12a	50
4e10d12a DSL	51	int unregister_acpi_bus_type(struct acpi_bus_type *type)
	52	{
	53	if (acpi_disabled)
	54	return 0;
	55	if (type) {
	56	down_write(&bus_type_sem);
	57	list_del_init(&type->list);
	58	up_write(&bus_type_sem);
53540098 RW	59	printk(KERN_INFO PREFIX "bus type %s unregistered\n",
53540098 RW	60	type->name);
4e10d12a DSL	61	return 0;
	62	}
	63	return -ENODEV;
	64	}
91e4d5a1	65	EXPORT_SYMBOL_GPL(unregister_acpi_bus_type);
4e10d12a	66
53540098	67	static struct acpi_bus_type acpi_get_bus_type(struct device dev)
4e10d12a DSL	68	{
	69	struct acpi_bus_type tmp, ret = NULL;
	70
	71	down_read(&bus_type_sem);
	72	list_for_each_entry(tmp, &bus_type_list, list) {
53540098	73	if (tmp->match(dev)) {
4e10d12a DSL	74	ret = tmp;
	75	break;
	76	}
	77	}
	78	up_read(&bus_type_sem);
	79	return ret;
	80	}
	81
11b88ee2 RW	82	#define FIND_CHILD_MIN_SCORE 1
	83	#define FIND_CHILD_MAX_SCORE 2
	84
d9fef0c4	85	static int find_child_checks(struct acpi_device *adev, bool check_children)
60f75b8e	86	{
11b88ee2	87	bool sta_present = true;
60f75b8e RW	88	unsigned long long sta;
	89	acpi_status status;
	90
d9fef0c4	91	status = acpi_evaluate_integer(adev->handle, "_STA", NULL, &sta);
11b88ee2 RW	92	if (status == AE_NOT_FOUND)
	93	sta_present = false;
	94	else if (ACPI_FAILURE(status) \|\| !(sta & ACPI_STA_DEVICE_ENABLED))
	95	return -ENODEV;
60f75b8e	96
d9fef0c4 RW	97	if (check_children && list_empty(&adev->children))
d9fef0c4 RW	98	return -ENODEV;
60f75b8e	99
11b88ee2	100	return sta_present ? FIND_CHILD_MAX_SCORE : FIND_CHILD_MIN_SCORE;
60f75b8e RW	101	}
60f75b8e RW	102
d9fef0c4 RW	103	struct acpi_device acpi_find_child_device(struct acpi_device parent,
d9fef0c4 RW	104	u64 address, bool check_children)
60f75b8e	105	{
d9fef0c4 RW	106	struct acpi_device adev, ret = NULL;
	107	int ret_score = 0;
	108
	109	list_for_each_entry(adev, &parent->children, node) {
	110	unsigned long long addr;
	111	acpi_status status;
	112	int score;
	113
	114	status = acpi_evaluate_integer(adev->handle, METHOD_NAME__ADR,
	115	NULL, &addr);
	116	if (ACPI_FAILURE(status) \|\| addr != address)
	117	continue;
	118
	119	if (!ret) {
	120	/* This is the first matching object. Save it. */
	121	ret = adev;
	122	continue;
	123	}
	124	/*
	125	* There is more than one matching device object with the same
	126	* _ADR value. That really is unexpected, so we are kind of
	127	* beyond the scope of the spec here. We have to choose which
	128	* one to return, though.
	129	*
	130	* First, check if the previously found object is good enough
	131	* and return it if so. Second, do the same for the object that
	132	* we've just found.
	133	*/
	134	if (!ret_score) {
	135	ret_score = find_child_checks(ret, check_children);
	136	if (ret_score == FIND_CHILD_MAX_SCORE)
	137	return ret;
	138	}
	139	score = find_child_checks(adev, check_children);
	140	if (score == FIND_CHILD_MAX_SCORE) {
	141	return adev;
	142	} else if (score > ret_score) {
	143	ret = adev;
	144	ret_score = score;
	145	}
4e10d12a	146	}
d9fef0c4	147	return ret;
4e10d12a DSL	148	}
4e10d12a DSL	149
d9fef0c4	150	acpi_handle acpi_find_child(acpi_handle handle, u64 addr, bool is_bridge)
4e10d12a	151	{
d9fef0c4 RW	152	struct acpi_device *adev;
	153
	154	if (!handle \|\| acpi_bus_get_device(handle, &adev))
	155	return NULL;
	156
	157	adev = acpi_find_child_device(adev, addr, is_bridge);
	158	return adev ? adev->handle : NULL;
33f767d7	159	}
60f75b8e	160	EXPORT_SYMBOL_GPL(acpi_find_child);
4e10d12a	161
bdbdbf91 RW	162	static void acpi_physnode_link_name(char *buf, unsigned int node_id)
	163	{
	164	if (node_id > 0)
	165	snprintf(buf, PHYSICAL_NODE_NAME_SIZE,
	166	PHYSICAL_NODE_STRING "%u", node_id);
	167	else
	168	strcpy(buf, PHYSICAL_NODE_STRING);
	169	}
	170
ac212b69	171	int acpi_bind_one(struct device *dev, acpi_handle handle)
4e10d12a	172	{
7b199811	173	struct acpi_device *acpi_dev = NULL;
f3fd0c8a	174	struct acpi_device_physical_node physical_node, pn;
007ccfcf RW	175	char physical_node_name[PHYSICAL_NODE_NAME_SIZE];
	176	struct list_head *physnode_list;
	177	unsigned int node_id;
1033f904	178	int retval = -EINVAL;
4e10d12a	179
7b199811	180	if (ACPI_COMPANION(dev)) {
f3fd0c8a	181	if (handle) {
7b199811	182	dev_warn(dev, "ACPI companion already set\n");
f3fd0c8a RW	183	return -EINVAL;
f3fd0c8a RW	184	} else {
7b199811	185	acpi_dev = ACPI_COMPANION(dev);
f3fd0c8a	186	}
7b199811 RW	187	} else {
7b199811 RW	188	acpi_bus_get_device(handle, &acpi_dev);
4e10d12a	189	}
7b199811	190	if (!acpi_dev)
f3fd0c8a	191	return -EINVAL;
1033f904	192
a104b4d4	193	get_device(&acpi_dev->dev);
4e10d12a	194	get_device(dev);
f3fd0c8a	195	physical_node = kzalloc(sizeof(*physical_node), GFP_KERNEL);
1033f904 LT	196	if (!physical_node) {
	197	retval = -ENOMEM;
	198	goto err;
4e10d12a	199	}
4e10d12a	200
1033f904	201	mutex_lock(&acpi_dev->physical_node_lock);
f3fd0c8a	202
007ccfcf RW	203	/*
	204	* Keep the list sorted by node_id so that the IDs of removed nodes can
	205	* be recycled easily.
	206	*/
	207	physnode_list = &acpi_dev->physical_node_list;
	208	node_id = 0;
	209	list_for_each_entry(pn, &acpi_dev->physical_node_list, node) {
	210	/* Sanity check. */
f3fd0c8a	211	if (pn->dev == dev) {
3342c753 RW	212	mutex_unlock(&acpi_dev->physical_node_lock);
3342c753 RW	213
f3fd0c8a	214	dev_warn(dev, "Already associated with ACPI node\n");
3342c753	215	kfree(physical_node);
7b199811	216	if (ACPI_COMPANION(dev) != acpi_dev)
3342c753	217	goto err;
3fe444ad	218
3342c753	219	put_device(dev);
a104b4d4	220	put_device(&acpi_dev->dev);
3342c753	221	return 0;
f3fd0c8a	222	}
007ccfcf RW	223	if (pn->node_id == node_id) {
	224	physnode_list = &pn->node;
	225	node_id++;
	226	}
1071695f DB	227	}
1071695f DB	228
007ccfcf	229	physical_node->node_id = node_id;
1033f904	230	physical_node->dev = dev;
007ccfcf	231	list_add(&physical_node->node, physnode_list);
1033f904	232	acpi_dev->physical_node_count++;
f3fd0c8a	233
7b199811 RW	234	if (!ACPI_COMPANION(dev))
7b199811 RW	235	ACPI_COMPANION_SET(dev, acpi_dev);
1033f904	236
bdbdbf91	237	acpi_physnode_link_name(physical_node_name, node_id);
1033f904	238	retval = sysfs_create_link(&acpi_dev->dev.kobj, &dev->kobj,
f501b6ec	239	physical_node_name);
464c1147 RW	240	if (retval)
	241	dev_err(&acpi_dev->dev, "Failed to create link %s (%d)\n",
	242	physical_node_name, retval);
	243
1033f904	244	retval = sysfs_create_link(&dev->kobj, &acpi_dev->dev.kobj,
f501b6ec	245	"firmware_node");
464c1147 RW	246	if (retval)
	247	dev_err(dev, "Failed to create link firmware_node (%d)\n",
	248	retval);
1033f904	249
40055206 RW	250	mutex_unlock(&acpi_dev->physical_node_lock);
40055206 RW	251
1033f904 LT	252	if (acpi_dev->wakeup.flags.valid)
	253	device_set_wakeup_capable(dev, true);
	254
4e10d12a	255	return 0;
1033f904 LT	256
1033f904 LT	257	err:
7b199811	258	ACPI_COMPANION_SET(dev, NULL);
1033f904	259	put_device(dev);
a104b4d4	260	put_device(&acpi_dev->dev);
1033f904	261	return retval;
4e10d12a	262	}
ac212b69	263	EXPORT_SYMBOL_GPL(acpi_bind_one);
4e10d12a	264
ac212b69	265	int acpi_unbind_one(struct device *dev)
4e10d12a	266	{
7b199811	267	struct acpi_device *acpi_dev = ACPI_COMPANION(dev);
1033f904	268	struct acpi_device_physical_node *entry;
1033f904	269
7b199811	270	if (!acpi_dev)
4e10d12a	271	return 0;
1071695f	272
1033f904	273	mutex_lock(&acpi_dev->physical_node_lock);
3e332783 RW	274
	275	list_for_each_entry(entry, &acpi_dev->physical_node_list, node)
	276	if (entry->dev == dev) {
	277	char physnode_name[PHYSICAL_NODE_NAME_SIZE];
	278
	279	list_del(&entry->node);
	280	acpi_dev->physical_node_count--;
	281
	282	acpi_physnode_link_name(physnode_name, entry->node_id);
	283	sysfs_remove_link(&acpi_dev->dev.kobj, physnode_name);
	284	sysfs_remove_link(&dev->kobj, "firmware_node");
7b199811	285	ACPI_COMPANION_SET(dev, NULL);
a104b4d4	286	/* Drop references taken by acpi_bind_one(). */
3e332783	287	put_device(dev);
a104b4d4	288	put_device(&acpi_dev->dev);
3e332783 RW	289	kfree(entry);
	290	break;
	291	}
	292
1033f904	293	mutex_unlock(&acpi_dev->physical_node_lock);
4e10d12a DSL	294	return 0;
4e10d12a DSL	295	}
ac212b69	296	EXPORT_SYMBOL_GPL(acpi_unbind_one);
4e10d12a	297
7b199811 RW	298	void acpi_preset_companion(struct device *dev, acpi_handle parent, u64 addr)
	299	{
	300	struct acpi_device *adev;
	301
	302	if (!acpi_bus_get_device(acpi_get_child(parent, addr), &adev))
	303	ACPI_COMPANION_SET(dev, adev);
	304	}
	305	EXPORT_SYMBOL_GPL(acpi_preset_companion);
	306
4e10d12a DSL	307	static int acpi_platform_notify(struct device *dev)
4e10d12a DSL	308	{
53540098	309	struct acpi_bus_type *type = acpi_get_bus_type(dev);
4e10d12a	310	acpi_handle handle;
11909ca1	311	int ret;
4e10d12a	312
f3fd0c8a	313	ret = acpi_bind_one(dev, NULL);
92414481	314	if (ret && type) {
11909ca1 RW	315	ret = type->find_device(dev, &handle);
	316	if (ret) {
	317	DBG("Unable to get handle for %s\n", dev_name(dev));
	318	goto out;
	319	}
	320	ret = acpi_bind_one(dev, handle);
	321	if (ret)
	322	goto out;
4e10d12a	323	}
11909ca1 RW	324
	325	if (type && type->setup)
	326	type->setup(dev);
4e10d12a	327
f3fd0c8a	328	out:
4e10d12a DSL	329	#if ACPI_GLUE_DEBUG
	330	if (!ret) {
	331	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
	332
a412a11d	333	acpi_get_name(ACPI_HANDLE(dev), ACPI_FULL_PATHNAME, &buffer);
db1461ad	334	DBG("Device %s -> %s\n", dev_name(dev), (char *)buffer.pointer);
02438d87	335	kfree(buffer.pointer);
4e10d12a	336	} else
db1461ad	337	DBG("Device %s -> No ACPI support\n", dev_name(dev));
4e10d12a DSL	338	#endif
	339
	340	return ret;
	341	}
	342
	343	static int acpi_platform_notify_remove(struct device *dev)
	344	{
11909ca1 RW	345	struct acpi_bus_type *type;
11909ca1 RW	346
53540098	347	type = acpi_get_bus_type(dev);
11909ca1 RW	348	if (type && type->cleanup)
	349	type->cleanup(dev);
	350
4e10d12a DSL	351	acpi_unbind_one(dev);
	352	return 0;
	353	}
	354
0e46517d	355	int __init init_acpi_device_notify(void)
4e10d12a	356	{
4e10d12a DSL	357	if (platform_notify \|\| platform_notify_remove) {
	358	printk(KERN_ERR PREFIX "Can't use platform_notify\n");
	359	return 0;
	360	}
	361	platform_notify = acpi_platform_notify;
	362	platform_notify_remove = acpi_platform_notify_remove;
	363	return 0;
	364	}