[deliverable/linux.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 acpi_status acpi_dev_present(acpi_handle handle, u32 lvl_not_used,
				  void *not_used, void **ret_p)
{
	struct acpi_device *adev = NULL;

	acpi_bus_get_device(handle, &adev);
	if (adev) {
		*ret_p = handle;
		return AE_CTRL_TERMINATE;
	}
	return AE_OK;
}

static int do_find_child_checks(acpi_handle handle, bool is_bridge)
{
	bool sta_present = true;
	unsigned long long sta;
	acpi_status status;

	status = acpi_evaluate_integer(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 (is_bridge) {
		void *test = NULL;

		/* Check if this object has at least one child device. */
		acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, 1,
				    acpi_dev_present, NULL, NULL, &test);
		if (!test)
			return -ENODEV;
	}
	return sta_present ? FIND_CHILD_MAX_SCORE : FIND_CHILD_MIN_SCORE;
}

struct find_child_context {
	u64 addr;
	bool is_bridge;
	acpi_handle ret;
	int ret_score;
};

static acpi_status do_find_child(acpi_handle handle, u32 lvl_not_used,
				 void *data, void **not_used)
{
	struct find_child_context *context = data;
	unsigned long long addr;
	acpi_status status;
	int score;

	status = acpi_evaluate_integer(handle, METHOD_NAME__ADR, NULL, &addr);
	if (ACPI_FAILURE(status) || addr != context->addr)
		return AE_OK;

	if (!context->ret) {
		/* This is the first matching object.  Save its handle. */
		context->ret = handle;
		return AE_OK;
	}
	/*
	 * There is more than one matching 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
	 * its handle if so.  Second, check the same for the object that we've
	 * just found.
	 */
	if (!context->ret_score) {
		score = do_find_child_checks(context->ret, context->is_bridge);
		if (score == FIND_CHILD_MAX_SCORE)
			return AE_CTRL_TERMINATE;
		else
			context->ret_score = score;
	}
	score = do_find_child_checks(handle, context->is_bridge);
	if (score == FIND_CHILD_MAX_SCORE) {
		context->ret = handle;
		return AE_CTRL_TERMINATE;
	} else if (score > context->ret_score) {
		context->ret = handle;
		context->ret_score = score;
	}
	return AE_OK;
}

acpi_handle acpi_find_child(acpi_handle parent, u64 addr, bool is_bridge)
{
	if (parent) {
		struct find_child_context context = {
			.addr = addr,
			.is_bridge = is_bridge,
		};

		acpi_walk_namespace(ACPI_TYPE_DEVICE, parent, 1, do_find_child,
				    NULL, &context, NULL);
		return context.ret;
	}
	return 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(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);
			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);
	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);
			/* acpi_bind_one() increase refcnt by one. */
			put_device(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
60f75b8e RW	85	static acpi_status acpi_dev_present(acpi_handle handle, u32 lvl_not_used,
60f75b8e RW	86	void not_used, void *ret_p)
4e10d12a	87	{
60f75b8e RW	88	struct acpi_device *adev = NULL;
	89
	90	acpi_bus_get_device(handle, &adev);
	91	if (adev) {
	92	*ret_p = handle;
	93	return AE_CTRL_TERMINATE;
	94	}
	95	return AE_OK;
	96	}
	97
11b88ee2	98	static int do_find_child_checks(acpi_handle handle, bool is_bridge)
60f75b8e	99	{
11b88ee2	100	bool sta_present = true;
60f75b8e RW	101	unsigned long long sta;
	102	acpi_status status;
	103
11b88ee2 RW	104	status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
	105	if (status == AE_NOT_FOUND)
	106	sta_present = false;
	107	else if (ACPI_FAILURE(status) \|\| !(sta & ACPI_STA_DEVICE_ENABLED))
	108	return -ENODEV;
60f75b8e RW	109
	110	if (is_bridge) {
	111	void *test = NULL;
	112
	113	/* Check if this object has at least one child device. */
	114	acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, 1,
	115	acpi_dev_present, NULL, NULL, &test);
11b88ee2 RW	116	if (!test)
11b88ee2 RW	117	return -ENODEV;
60f75b8e	118	}
11b88ee2	119	return sta_present ? FIND_CHILD_MAX_SCORE : FIND_CHILD_MIN_SCORE;
60f75b8e RW	120	}
	121
	122	struct find_child_context {
	123	u64 addr;
	124	bool is_bridge;
	125	acpi_handle ret;
11b88ee2	126	int ret_score;
60f75b8e RW	127	};
	128
	129	static acpi_status do_find_child(acpi_handle handle, u32 lvl_not_used,
	130	void data, void *not_used)
	131	{
	132	struct find_child_context *context = data;
	133	unsigned long long addr;
4e10d12a	134	acpi_status status;
11b88ee2	135	int score;
33f767d7 RW	136
33f767d7 RW	137	status = acpi_evaluate_integer(handle, METHOD_NAME__ADR, NULL, &addr);
60f75b8e RW	138	if (ACPI_FAILURE(status) \|\| addr != context->addr)
	139	return AE_OK;
	140
	141	if (!context->ret) {
	142	/* This is the first matching object. Save its handle. */
	143	context->ret = handle;
	144	return AE_OK;
	145	}
	146	/*
	147	* There is more than one matching object with the same _ADR value.
	148	* That really is unexpected, so we are kind of beyond the scope of the
	149	* spec here. We have to choose which one to return, though.
	150	*
	151	* First, check if the previously found object is good enough and return
	152	* its handle if so. Second, check the same for the object that we've
	153	* just found.
	154	*/
11b88ee2 RW	155	if (!context->ret_score) {
	156	score = do_find_child_checks(context->ret, context->is_bridge);
	157	if (score == FIND_CHILD_MAX_SCORE)
c7d9ca90	158	return AE_CTRL_TERMINATE;
60f75b8e	159	else
11b88ee2	160	context->ret_score = score;
60f75b8e	161	}
11b88ee2 RW	162	score = do_find_child_checks(handle, context->is_bridge);
11b88ee2 RW	163	if (score == FIND_CHILD_MAX_SCORE) {
60f75b8e RW	164	context->ret = handle;
60f75b8e RW	165	return AE_CTRL_TERMINATE;
11b88ee2 RW	166	} else if (score > context->ret_score) {
	167	context->ret = handle;
	168	context->ret_score = score;
4e10d12a DSL	169	}
	170	return AE_OK;
	171	}
	172
60f75b8e	173	acpi_handle acpi_find_child(acpi_handle parent, u64 addr, bool is_bridge)
4e10d12a	174	{
60f75b8e RW	175	if (parent) {
	176	struct find_child_context context = {
	177	.addr = addr,
	178	.is_bridge = is_bridge,
	179	};
4e10d12a	180
60f75b8e RW	181	acpi_walk_namespace(ACPI_TYPE_DEVICE, parent, 1, do_find_child,
	182	NULL, &context, NULL);
	183	return context.ret;
	184	}
	185	return NULL;
33f767d7	186	}
60f75b8e	187	EXPORT_SYMBOL_GPL(acpi_find_child);
4e10d12a	188
bdbdbf91 RW	189	static void acpi_physnode_link_name(char *buf, unsigned int node_id)
	190	{
	191	if (node_id > 0)
	192	snprintf(buf, PHYSICAL_NODE_NAME_SIZE,
	193	PHYSICAL_NODE_STRING "%u", node_id);
	194	else
	195	strcpy(buf, PHYSICAL_NODE_STRING);
	196	}
	197
ac212b69	198	int acpi_bind_one(struct device *dev, acpi_handle handle)
4e10d12a	199	{
7b199811	200	struct acpi_device *acpi_dev = NULL;
f3fd0c8a	201	struct acpi_device_physical_node physical_node, pn;
007ccfcf RW	202	char physical_node_name[PHYSICAL_NODE_NAME_SIZE];
	203	struct list_head *physnode_list;
	204	unsigned int node_id;
1033f904	205	int retval = -EINVAL;
4e10d12a	206
7b199811	207	if (ACPI_COMPANION(dev)) {
f3fd0c8a	208	if (handle) {
7b199811	209	dev_warn(dev, "ACPI companion already set\n");
f3fd0c8a RW	210	return -EINVAL;
f3fd0c8a RW	211	} else {
7b199811	212	acpi_dev = ACPI_COMPANION(dev);
f3fd0c8a	213	}
7b199811 RW	214	} else {
7b199811 RW	215	acpi_bus_get_device(handle, &acpi_dev);
4e10d12a	216	}
7b199811	217	if (!acpi_dev)
f3fd0c8a	218	return -EINVAL;
1033f904	219
4e10d12a	220	get_device(dev);
f3fd0c8a	221	physical_node = kzalloc(sizeof(*physical_node), GFP_KERNEL);
1033f904 LT	222	if (!physical_node) {
	223	retval = -ENOMEM;
	224	goto err;
4e10d12a	225	}
4e10d12a	226
1033f904	227	mutex_lock(&acpi_dev->physical_node_lock);
f3fd0c8a	228
007ccfcf RW	229	/*
	230	* Keep the list sorted by node_id so that the IDs of removed nodes can
	231	* be recycled easily.
	232	*/
	233	physnode_list = &acpi_dev->physical_node_list;
	234	node_id = 0;
	235	list_for_each_entry(pn, &acpi_dev->physical_node_list, node) {
	236	/* Sanity check. */
f3fd0c8a	237	if (pn->dev == dev) {
3342c753 RW	238	mutex_unlock(&acpi_dev->physical_node_lock);
3342c753 RW	239
f3fd0c8a	240	dev_warn(dev, "Already associated with ACPI node\n");
3342c753	241	kfree(physical_node);
7b199811	242	if (ACPI_COMPANION(dev) != acpi_dev)
3342c753	243	goto err;
3fe444ad	244
3342c753 RW	245	put_device(dev);
3342c753 RW	246	return 0;
f3fd0c8a	247	}
007ccfcf RW	248	if (pn->node_id == node_id) {
	249	physnode_list = &pn->node;
	250	node_id++;
	251	}
1071695f DB	252	}
1071695f DB	253
007ccfcf	254	physical_node->node_id = node_id;
1033f904	255	physical_node->dev = dev;
007ccfcf	256	list_add(&physical_node->node, physnode_list);
1033f904	257	acpi_dev->physical_node_count++;
f3fd0c8a	258
7b199811 RW	259	if (!ACPI_COMPANION(dev))
7b199811 RW	260	ACPI_COMPANION_SET(dev, acpi_dev);
1033f904	261
bdbdbf91	262	acpi_physnode_link_name(physical_node_name, node_id);
1033f904	263	retval = sysfs_create_link(&acpi_dev->dev.kobj, &dev->kobj,
f501b6ec	264	physical_node_name);
464c1147 RW	265	if (retval)
	266	dev_err(&acpi_dev->dev, "Failed to create link %s (%d)\n",
	267	physical_node_name, retval);
	268
1033f904	269	retval = sysfs_create_link(&dev->kobj, &acpi_dev->dev.kobj,
f501b6ec	270	"firmware_node");
464c1147 RW	271	if (retval)
	272	dev_err(dev, "Failed to create link firmware_node (%d)\n",
	273	retval);
1033f904	274
40055206 RW	275	mutex_unlock(&acpi_dev->physical_node_lock);
40055206 RW	276
1033f904 LT	277	if (acpi_dev->wakeup.flags.valid)
	278	device_set_wakeup_capable(dev, true);
	279
4e10d12a	280	return 0;
1033f904 LT	281
1033f904 LT	282	err:
7b199811	283	ACPI_COMPANION_SET(dev, NULL);
1033f904 LT	284	put_device(dev);
1033f904 LT	285	return retval;
4e10d12a	286	}
ac212b69	287	EXPORT_SYMBOL_GPL(acpi_bind_one);
4e10d12a	288
ac212b69	289	int acpi_unbind_one(struct device *dev)
4e10d12a	290	{
7b199811	291	struct acpi_device *acpi_dev = ACPI_COMPANION(dev);
1033f904	292	struct acpi_device_physical_node *entry;
1033f904	293
7b199811	294	if (!acpi_dev)
4e10d12a	295	return 0;
1071695f	296
1033f904	297	mutex_lock(&acpi_dev->physical_node_lock);
3e332783 RW	298
	299	list_for_each_entry(entry, &acpi_dev->physical_node_list, node)
	300	if (entry->dev == dev) {
	301	char physnode_name[PHYSICAL_NODE_NAME_SIZE];
	302
	303	list_del(&entry->node);
	304	acpi_dev->physical_node_count--;
	305
	306	acpi_physnode_link_name(physnode_name, entry->node_id);
	307	sysfs_remove_link(&acpi_dev->dev.kobj, physnode_name);
	308	sysfs_remove_link(&dev->kobj, "firmware_node");
7b199811	309	ACPI_COMPANION_SET(dev, NULL);
3e332783 RW	310	/* acpi_bind_one() increase refcnt by one. */
	311	put_device(dev);
	312	kfree(entry);
	313	break;
	314	}
	315
1033f904	316	mutex_unlock(&acpi_dev->physical_node_lock);
4e10d12a DSL	317	return 0;
4e10d12a DSL	318	}
ac212b69	319	EXPORT_SYMBOL_GPL(acpi_unbind_one);
4e10d12a	320
7b199811 RW	321	void acpi_preset_companion(struct device *dev, acpi_handle parent, u64 addr)
	322	{
	323	struct acpi_device *adev;
	324
	325	if (!acpi_bus_get_device(acpi_get_child(parent, addr), &adev))
	326	ACPI_COMPANION_SET(dev, adev);
	327	}
	328	EXPORT_SYMBOL_GPL(acpi_preset_companion);
	329
4e10d12a DSL	330	static int acpi_platform_notify(struct device *dev)
4e10d12a DSL	331	{
53540098	332	struct acpi_bus_type *type = acpi_get_bus_type(dev);
4e10d12a	333	acpi_handle handle;
11909ca1	334	int ret;
4e10d12a	335
f3fd0c8a	336	ret = acpi_bind_one(dev, NULL);
92414481	337	if (ret && type) {
11909ca1 RW	338	ret = type->find_device(dev, &handle);
	339	if (ret) {
	340	DBG("Unable to get handle for %s\n", dev_name(dev));
	341	goto out;
	342	}
	343	ret = acpi_bind_one(dev, handle);
	344	if (ret)
	345	goto out;
4e10d12a	346	}
11909ca1 RW	347
	348	if (type && type->setup)
	349	type->setup(dev);
4e10d12a	350
f3fd0c8a	351	out:
4e10d12a DSL	352	#if ACPI_GLUE_DEBUG
	353	if (!ret) {
	354	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
	355
a412a11d	356	acpi_get_name(ACPI_HANDLE(dev), ACPI_FULL_PATHNAME, &buffer);
db1461ad	357	DBG("Device %s -> %s\n", dev_name(dev), (char *)buffer.pointer);
02438d87	358	kfree(buffer.pointer);
4e10d12a	359	} else
db1461ad	360	DBG("Device %s -> No ACPI support\n", dev_name(dev));
4e10d12a DSL	361	#endif
	362
	363	return ret;
	364	}
	365
	366	static int acpi_platform_notify_remove(struct device *dev)
	367	{
11909ca1 RW	368	struct acpi_bus_type *type;
11909ca1 RW	369
53540098	370	type = acpi_get_bus_type(dev);
11909ca1 RW	371	if (type && type->cleanup)
	372	type->cleanup(dev);
	373
4e10d12a DSL	374	acpi_unbind_one(dev);
	375	return 0;
	376	}
	377
0e46517d	378	int __init init_acpi_device_notify(void)
4e10d12a	379	{
4e10d12a DSL	380	if (platform_notify \|\| platform_notify_remove) {
	381	printk(KERN_ERR PREFIX "Can't use platform_notify\n");
	382	return 0;
	383	}
	384	platform_notify = acpi_platform_notify;
	385	platform_notify_remove = acpi_platform_notify_remove;
	386	return 0;
	387	}