[mirror_ubuntu-zesty-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/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/platform_device.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_companion) {
		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;

	/*
	 * 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.]
	 */
	return sta_present && !adev->pnp.type.platform_id ?
			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;

	if (!parent)
		return NULL;

	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;
}
EXPORT_SYMBOL_GPL(acpi_find_child_device);

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;
	enum dev_dma_attr attr;

	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;

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

	attr = acpi_get_dma_attr(acpi_dev);
	if (attr != DEV_DMA_NOT_SUPPORTED)
		acpi_dma_configure(dev, attr);

	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);

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

	ret = acpi_bind_one(dev, NULL);
	if (ret && type) {
		struct acpi_device *adev;

		adev = type->find_companion(dev);
		if (!adev) {
			DBG("Unable to get handle for %s\n", dev_name(dev));
			ret = -ENODEV;
			goto out;
		}
		ret = acpi_bind_one(dev, adev);
		if (ret)
			goto out;
	}
	adev = ACPI_COMPANION(dev);
	if (!adev)
		goto out;

	if (dev->bus == &platform_bus_type)
		acpi_configure_pmsi_domain(dev);

	if (type && type->setup)
		type->setup(dev);
	else if (adev->handler && adev->handler->bind)
		adev->handler->bind(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_device *adev = ACPI_COMPANION(dev);
	struct acpi_bus_type *type;

	if (!adev)
		return 0;

	type = acpi_get_bus_type(dev);
	if (type && type->cleanup)
		type->cleanup(dev);
	else if (adev->handler && adev->handler->unbind)
		adev->handler->unbind(dev);

	acpi_unbind_one(dev);
	return 0;
}

void __init init_acpi_device_notify(void)
{
	if (platform_notify || platform_notify_remove) {
		printk(KERN_ERR PREFIX "Can't use platform_notify\n");
		return;
	}
	platform_notify = acpi_platform_notify;
	platform_notify_remove = acpi_platform_notify_remove;
}
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	*/
6b81bed4 HG	9
6b81bed4 HG	10	#include <linux/acpi_iort.h>
214f2c90	11	#include <linux/export.h>
4e10d12a DSL	12	#include <linux/init.h>
	13	#include <linux/list.h>
	14	#include <linux/device.h>
5a0e3ad6	15	#include <linux/slab.h>
4e10d12a DSL	16	#include <linux/rwsem.h>
4e10d12a DSL	17	#include <linux/acpi.h>
d0562674	18	#include <linux/dma-mapping.h>
6b81bed4	19	#include <linux/platform_device.h>
4e10d12a	20
a192a958 LB	21	#include "internal.h"
a192a958 LB	22
4e10d12a DSL	23	#define ACPI_GLUE_DEBUG 0
4e10d12a DSL	24	#if ACPI_GLUE_DEBUG
23415eb5 JP	25	#define DBG(fmt, ...) \
23415eb5 JP	26	printk(KERN_DEBUG PREFIX fmt, ##__VA_ARGS__)
4e10d12a	27	#else
23415eb5 JP	28	#define DBG(fmt, ...) \
	29	do { \
	30	if (0) \
	31	printk(KERN_DEBUG PREFIX fmt, ##__VA_ARGS__); \
	32	} while (0)
4e10d12a DSL	33	#endif
	34	static LIST_HEAD(bus_type_list);
	35	static DECLARE_RWSEM(bus_type_sem);
	36
1033f904	37	#define PHYSICAL_NODE_STRING "physical_node"
007ccfcf	38	#define PHYSICAL_NODE_NAME_SIZE (sizeof(PHYSICAL_NODE_STRING) + 10)
1033f904	39
4e10d12a DSL	40	int register_acpi_bus_type(struct acpi_bus_type *type)
	41	{
	42	if (acpi_disabled)
	43	return -ENODEV;
e3f02c52	44	if (type && type->match && type->find_companion) {
4e10d12a DSL	45	down_write(&bus_type_sem);
	46	list_add_tail(&type->list, &bus_type_list);
	47	up_write(&bus_type_sem);
53540098	48	printk(KERN_INFO PREFIX "bus type %s registered\n", type->name);
4e10d12a DSL	49	return 0;
	50	}
	51	return -ENODEV;
	52	}
91e4d5a1	53	EXPORT_SYMBOL_GPL(register_acpi_bus_type);
4e10d12a	54
4e10d12a DSL	55	int unregister_acpi_bus_type(struct acpi_bus_type *type)
	56	{
	57	if (acpi_disabled)
	58	return 0;
	59	if (type) {
	60	down_write(&bus_type_sem);
	61	list_del_init(&type->list);
	62	up_write(&bus_type_sem);
53540098 RW	63	printk(KERN_INFO PREFIX "bus type %s unregistered\n",
53540098 RW	64	type->name);
4e10d12a DSL	65	return 0;
	66	}
	67	return -ENODEV;
	68	}
91e4d5a1	69	EXPORT_SYMBOL_GPL(unregister_acpi_bus_type);
4e10d12a	70
53540098	71	static struct acpi_bus_type acpi_get_bus_type(struct device dev)
4e10d12a DSL	72	{
	73	struct acpi_bus_type tmp, ret = NULL;
	74
	75	down_read(&bus_type_sem);
	76	list_for_each_entry(tmp, &bus_type_list, list) {
53540098	77	if (tmp->match(dev)) {
4e10d12a DSL	78	ret = tmp;
	79	break;
	80	}
	81	}
	82	up_read(&bus_type_sem);
	83	return ret;
	84	}
	85
11b88ee2 RW	86	#define FIND_CHILD_MIN_SCORE 1
	87	#define FIND_CHILD_MAX_SCORE 2
	88
d9fef0c4	89	static int find_child_checks(struct acpi_device *adev, bool check_children)
60f75b8e	90	{
11b88ee2	91	bool sta_present = true;
60f75b8e RW	92	unsigned long long sta;
	93	acpi_status status;
	94
d9fef0c4	95	status = acpi_evaluate_integer(adev->handle, "_STA", NULL, &sta);
11b88ee2 RW	96	if (status == AE_NOT_FOUND)
	97	sta_present = false;
	98	else if (ACPI_FAILURE(status) \|\| !(sta & ACPI_STA_DEVICE_ENABLED))
	99	return -ENODEV;
60f75b8e	100
d9fef0c4 RW	101	if (check_children && list_empty(&adev->children))
d9fef0c4 RW	102	return -ENODEV;
60f75b8e	103
c2a6bbaf	104	/*
6912abb2 RW	105	* If the device has a _HID returning a valid ACPI/PNP device ID, it is
	106	* better to make it look less attractive here, so that the other device
	107	* with the same _ADR value (that may not have a valid device ID) can be
	108	* matched going forward. [This means a second spec violation in a row,
	109	* so whatever we do here is best effort anyway.]
c2a6bbaf	110	*/
6912abb2	111	return sta_present && !adev->pnp.type.platform_id ?
c2a6bbaf	112	FIND_CHILD_MAX_SCORE : FIND_CHILD_MIN_SCORE;
60f75b8e RW	113	}
60f75b8e RW	114
d9fef0c4 RW	115	struct acpi_device acpi_find_child_device(struct acpi_device parent,
d9fef0c4 RW	116	u64 address, bool check_children)
60f75b8e	117	{
d9fef0c4 RW	118	struct acpi_device adev, ret = NULL;
	119	int ret_score = 0;
	120
5ce79d20 RW	121	if (!parent)
	122	return NULL;
	123
d9fef0c4 RW	124	list_for_each_entry(adev, &parent->children, node) {
	125	unsigned long long addr;
	126	acpi_status status;
	127	int score;
	128
	129	status = acpi_evaluate_integer(adev->handle, METHOD_NAME__ADR,
	130	NULL, &addr);
	131	if (ACPI_FAILURE(status) \|\| addr != address)
	132	continue;
	133
	134	if (!ret) {
	135	/* This is the first matching object. Save it. */
	136	ret = adev;
	137	continue;
	138	}
	139	/*
	140	* There is more than one matching device object with the same
	141	* _ADR value. That really is unexpected, so we are kind of
	142	* beyond the scope of the spec here. We have to choose which
	143	* one to return, though.
	144	*
	145	* First, check if the previously found object is good enough
	146	* and return it if so. Second, do the same for the object that
	147	* we've just found.
	148	*/
	149	if (!ret_score) {
	150	ret_score = find_child_checks(ret, check_children);
	151	if (ret_score == FIND_CHILD_MAX_SCORE)
	152	return ret;
	153	}
	154	score = find_child_checks(adev, check_children);
	155	if (score == FIND_CHILD_MAX_SCORE) {
	156	return adev;
	157	} else if (score > ret_score) {
	158	ret = adev;
	159	ret_score = score;
	160	}
4e10d12a	161	}
d9fef0c4	162	return ret;
4e10d12a	163	}
9c5ad36d	164	EXPORT_SYMBOL_GPL(acpi_find_child_device);
4e10d12a	165
bdbdbf91 RW	166	static void acpi_physnode_link_name(char *buf, unsigned int node_id)
	167	{
	168	if (node_id > 0)
	169	snprintf(buf, PHYSICAL_NODE_NAME_SIZE,
	170	PHYSICAL_NODE_STRING "%u", node_id);
	171	else
	172	strcpy(buf, PHYSICAL_NODE_STRING);
	173	}
	174
24dee1fc	175	int acpi_bind_one(struct device dev, struct acpi_device acpi_dev)
4e10d12a	176	{
f3fd0c8a	177	struct acpi_device_physical_node physical_node, pn;
007ccfcf RW	178	char physical_node_name[PHYSICAL_NODE_NAME_SIZE];
	179	struct list_head *physnode_list;
	180	unsigned int node_id;
1033f904	181	int retval = -EINVAL;
1831eff8	182	enum dev_dma_attr attr;
4e10d12a	183
ca5b74d2	184	if (has_acpi_companion(dev)) {
24dee1fc	185	if (acpi_dev) {
7b199811	186	dev_warn(dev, "ACPI companion already set\n");
f3fd0c8a RW	187	return -EINVAL;
f3fd0c8a RW	188	} else {
7b199811	189	acpi_dev = ACPI_COMPANION(dev);
f3fd0c8a	190	}
4e10d12a	191	}
7b199811	192	if (!acpi_dev)
f3fd0c8a	193	return -EINVAL;
1033f904	194
a104b4d4	195	get_device(&acpi_dev->dev);
4e10d12a	196	get_device(dev);
f3fd0c8a	197	physical_node = kzalloc(sizeof(*physical_node), GFP_KERNEL);
1033f904 LT	198	if (!physical_node) {
	199	retval = -ENOMEM;
	200	goto err;
4e10d12a	201	}
4e10d12a	202
1033f904	203	mutex_lock(&acpi_dev->physical_node_lock);
f3fd0c8a	204
007ccfcf RW	205	/*
	206	* Keep the list sorted by node_id so that the IDs of removed nodes can
	207	* be recycled easily.
	208	*/
	209	physnode_list = &acpi_dev->physical_node_list;
	210	node_id = 0;
	211	list_for_each_entry(pn, &acpi_dev->physical_node_list, node) {
	212	/* Sanity check. */
f3fd0c8a	213	if (pn->dev == dev) {
3342c753 RW	214	mutex_unlock(&acpi_dev->physical_node_lock);
3342c753 RW	215
f3fd0c8a	216	dev_warn(dev, "Already associated with ACPI node\n");
3342c753	217	kfree(physical_node);
7b199811	218	if (ACPI_COMPANION(dev) != acpi_dev)
3342c753	219	goto err;
3fe444ad	220
3342c753	221	put_device(dev);
a104b4d4	222	put_device(&acpi_dev->dev);
3342c753	223	return 0;
f3fd0c8a	224	}
007ccfcf RW	225	if (pn->node_id == node_id) {
	226	physnode_list = &pn->node;
	227	node_id++;
	228	}
1071695f DB	229	}
1071695f DB	230
007ccfcf	231	physical_node->node_id = node_id;
1033f904	232	physical_node->dev = dev;
007ccfcf	233	list_add(&physical_node->node, physnode_list);
1033f904	234	acpi_dev->physical_node_count++;
f3fd0c8a	235
ca5b74d2	236	if (!has_acpi_companion(dev))
7b199811	237	ACPI_COMPANION_SET(dev, acpi_dev);
1033f904	238
1831eff8 SS	239	attr = acpi_get_dma_attr(acpi_dev);
1831eff8 SS	240	if (attr != DEV_DMA_NOT_SUPPORTED)
d760a1ba	241	acpi_dma_configure(dev, attr);
d0562674	242
bdbdbf91	243	acpi_physnode_link_name(physical_node_name, node_id);
1033f904	244	retval = sysfs_create_link(&acpi_dev->dev.kobj, &dev->kobj,
f501b6ec	245	physical_node_name);
464c1147 RW	246	if (retval)
	247	dev_err(&acpi_dev->dev, "Failed to create link %s (%d)\n",
	248	physical_node_name, retval);
	249
1033f904	250	retval = sysfs_create_link(&dev->kobj, &acpi_dev->dev.kobj,
f501b6ec	251	"firmware_node");
464c1147 RW	252	if (retval)
	253	dev_err(dev, "Failed to create link firmware_node (%d)\n",
	254	retval);
1033f904	255
40055206 RW	256	mutex_unlock(&acpi_dev->physical_node_lock);
40055206 RW	257
1033f904 LT	258	if (acpi_dev->wakeup.flags.valid)
	259	device_set_wakeup_capable(dev, true);
	260
4e10d12a	261	return 0;
1033f904 LT	262
1033f904 LT	263	err:
7b199811	264	ACPI_COMPANION_SET(dev, NULL);
1033f904	265	put_device(dev);
a104b4d4	266	put_device(&acpi_dev->dev);
1033f904	267	return retval;
4e10d12a	268	}
ac212b69	269	EXPORT_SYMBOL_GPL(acpi_bind_one);
4e10d12a	270
ac212b69	271	int acpi_unbind_one(struct device *dev)
4e10d12a	272	{
7b199811	273	struct acpi_device *acpi_dev = ACPI_COMPANION(dev);
1033f904	274	struct acpi_device_physical_node *entry;
1033f904	275
7b199811	276	if (!acpi_dev)
4e10d12a	277	return 0;
1071695f	278
1033f904	279	mutex_lock(&acpi_dev->physical_node_lock);
3e332783 RW	280
	281	list_for_each_entry(entry, &acpi_dev->physical_node_list, node)
	282	if (entry->dev == dev) {
	283	char physnode_name[PHYSICAL_NODE_NAME_SIZE];
	284
	285	list_del(&entry->node);
	286	acpi_dev->physical_node_count--;
	287
	288	acpi_physnode_link_name(physnode_name, entry->node_id);
	289	sysfs_remove_link(&acpi_dev->dev.kobj, physnode_name);
	290	sysfs_remove_link(&dev->kobj, "firmware_node");
7b199811	291	ACPI_COMPANION_SET(dev, NULL);
a104b4d4	292	/* Drop references taken by acpi_bind_one(). */
3e332783	293	put_device(dev);
a104b4d4	294	put_device(&acpi_dev->dev);
3e332783 RW	295	kfree(entry);
	296	break;
	297	}
	298
1033f904	299	mutex_unlock(&acpi_dev->physical_node_lock);
4e10d12a DSL	300	return 0;
4e10d12a DSL	301	}
ac212b69	302	EXPORT_SYMBOL_GPL(acpi_unbind_one);
4e10d12a DSL	303
	304	static int acpi_platform_notify(struct device *dev)
	305	{
53540098	306	struct acpi_bus_type *type = acpi_get_bus_type(dev);
9cb32acf	307	struct acpi_device *adev;
11909ca1	308	int ret;
4e10d12a	309
f3fd0c8a	310	ret = acpi_bind_one(dev, NULL);
92414481	311	if (ret && type) {
e3f02c52 RW	312	struct acpi_device *adev;
	313
	314	adev = type->find_companion(dev);
	315	if (!adev) {
11909ca1	316	DBG("Unable to get handle for %s\n", dev_name(dev));
e3f02c52	317	ret = -ENODEV;
11909ca1 RW	318	goto out;
11909ca1 RW	319	}
24dee1fc	320	ret = acpi_bind_one(dev, adev);
11909ca1 RW	321	if (ret)
11909ca1 RW	322	goto out;
4e10d12a	323	}
9cb32acf RW	324	adev = ACPI_COMPANION(dev);
	325	if (!adev)
	326	goto out;
11909ca1	327
6b81bed4 HG	328	if (dev->bus == &platform_bus_type)
	329	acpi_configure_pmsi_domain(dev);
	330
11909ca1 RW	331	if (type && type->setup)
11909ca1 RW	332	type->setup(dev);
9cb32acf RW	333	else if (adev->handler && adev->handler->bind)
9cb32acf RW	334	adev->handler->bind(dev);
4e10d12a	335
f3fd0c8a	336	out:
4e10d12a DSL	337	#if ACPI_GLUE_DEBUG
	338	if (!ret) {
	339	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
	340
a412a11d	341	acpi_get_name(ACPI_HANDLE(dev), ACPI_FULL_PATHNAME, &buffer);
db1461ad	342	DBG("Device %s -> %s\n", dev_name(dev), (char *)buffer.pointer);
02438d87	343	kfree(buffer.pointer);
4e10d12a	344	} else
db1461ad	345	DBG("Device %s -> No ACPI support\n", dev_name(dev));
4e10d12a DSL	346	#endif
	347
	348	return ret;
	349	}
	350
	351	static int acpi_platform_notify_remove(struct device *dev)
	352	{
9cb32acf	353	struct acpi_device *adev = ACPI_COMPANION(dev);
11909ca1 RW	354	struct acpi_bus_type *type;
11909ca1 RW	355
9cb32acf RW	356	if (!adev)
	357	return 0;
	358
53540098	359	type = acpi_get_bus_type(dev);
11909ca1 RW	360	if (type && type->cleanup)
11909ca1 RW	361	type->cleanup(dev);
9cb32acf RW	362	else if (adev->handler && adev->handler->unbind)
9cb32acf RW	363	adev->handler->unbind(dev);
11909ca1	364
4e10d12a DSL	365	acpi_unbind_one(dev);
	366	return 0;
	367	}
	368
c33cab60	369	void __init init_acpi_device_notify(void)
4e10d12a	370	{
4e10d12a DSL	371	if (platform_notify \|\| platform_notify_remove) {
4e10d12a DSL	372	printk(KERN_ERR PREFIX "Can't use platform_notify\n");
c33cab60	373	return;
4e10d12a DSL	374	}
	375	platform_notify = acpi_platform_notify;
	376	platform_notify_remove = acpi_platform_notify_remove;
4e10d12a	377	}