[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"

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;
}

static acpi_status do_acpi_find_child(acpi_handle handle, u32 lvl_not_used,
				      void *addr_p, void **ret_p)
{
	unsigned long long addr, sta;
	acpi_status status;

	status = acpi_evaluate_integer(handle, METHOD_NAME__ADR, NULL, &addr);
	if (ACPI_SUCCESS(status) && addr == *((u64 *)addr_p)) {
		*ret_p = handle;
		status = acpi_bus_get_status_handle(handle, &sta);
		if (ACPI_SUCCESS(status) && (sta & ACPI_STA_DEVICE_ENABLED))
			return AE_CTRL_TERMINATE;
	}
	return AE_OK;
}

acpi_handle acpi_get_child(acpi_handle parent, u64 address)
{
	void *ret = NULL;

	if (!parent)
		return NULL;

	acpi_walk_namespace(ACPI_TYPE_DEVICE, parent, 1, NULL,
			    do_acpi_find_child, &address, &ret);
	return (acpi_handle)ret;
}
EXPORT_SYMBOL(acpi_get_child);

int acpi_bind_one(struct device *dev, acpi_handle handle)
{
	struct acpi_device *acpi_dev;
	acpi_status status;
	struct acpi_device_physical_node *physical_node, *pn;
	char physical_node_name[sizeof(PHYSICAL_NODE_STRING) + 2];
	int retval = -EINVAL;

	if (ACPI_HANDLE(dev)) {
		if (handle) {
			dev_warn(dev, "ACPI handle is already set\n");
			return -EINVAL;
		} else {
			handle = ACPI_HANDLE(dev);
		}
	}
	if (!handle)
		return -EINVAL;

	get_device(dev);
	status = acpi_bus_get_device(handle, &acpi_dev);
	if (ACPI_FAILURE(status))
		goto err;

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

	mutex_lock(&acpi_dev->physical_node_lock);

	/* Sanity check. */
	list_for_each_entry(pn, &acpi_dev->physical_node_list, node)
		if (pn->dev == dev) {
			dev_warn(dev, "Already associated with ACPI node\n");
			goto err_free;
		}

	/* allocate physical node id according to physical_node_id_bitmap */
	physical_node->node_id =
		find_first_zero_bit(acpi_dev->physical_node_id_bitmap,
		ACPI_MAX_PHYSICAL_NODE);
	if (physical_node->node_id >= ACPI_MAX_PHYSICAL_NODE) {
		retval = -ENOSPC;
		goto err_free;
	}

	set_bit(physical_node->node_id, acpi_dev->physical_node_id_bitmap);
	physical_node->dev = dev;
	list_add_tail(&physical_node->node, &acpi_dev->physical_node_list);
	acpi_dev->physical_node_count++;

	mutex_unlock(&acpi_dev->physical_node_lock);

	if (!ACPI_HANDLE(dev))
		ACPI_HANDLE_SET(dev, acpi_dev->handle);

	if (!physical_node->node_id)
		strcpy(physical_node_name, PHYSICAL_NODE_STRING);
	else
		sprintf(physical_node_name,
			"physical_node%d", physical_node->node_id);
	retval = sysfs_create_link(&acpi_dev->dev.kobj, &dev->kobj,
			physical_node_name);
	retval = sysfs_create_link(&dev->kobj, &acpi_dev->dev.kobj,
		"firmware_node");

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

	return 0;

 err:
	ACPI_HANDLE_SET(dev, NULL);
	put_device(dev);
	return retval;

 err_free:
	mutex_unlock(&acpi_dev->physical_node_lock);
	kfree(physical_node);
	goto err;
}
EXPORT_SYMBOL_GPL(acpi_bind_one);

int acpi_unbind_one(struct device *dev)
{
	struct acpi_device_physical_node *entry;
	struct acpi_device *acpi_dev;
	acpi_status status;
	struct list_head *node, *next;

	if (!ACPI_HANDLE(dev))
		return 0;

	status = acpi_bus_get_device(ACPI_HANDLE(dev), &acpi_dev);
	if (ACPI_FAILURE(status))
		goto err;

	mutex_lock(&acpi_dev->physical_node_lock);
	list_for_each_safe(node, next, &acpi_dev->physical_node_list) {
		char physical_node_name[sizeof(PHYSICAL_NODE_STRING) + 2];

		entry = list_entry(node, struct acpi_device_physical_node,
			node);
		if (entry->dev != dev)
			continue;

		list_del(node);
		clear_bit(entry->node_id, acpi_dev->physical_node_id_bitmap);

		acpi_dev->physical_node_count--;

		if (!entry->node_id)
			strcpy(physical_node_name, PHYSICAL_NODE_STRING);
		else
			sprintf(physical_node_name,
				"physical_node%d", entry->node_id);

		sysfs_remove_link(&acpi_dev->dev.kobj, physical_node_name);
		sysfs_remove_link(&dev->kobj, "firmware_node");
		ACPI_HANDLE_SET(dev, NULL);
		/* acpi_bind_one increase refcnt by one */
		put_device(dev);
		kfree(entry);
	}
	mutex_unlock(&acpi_dev->physical_node_lock);

	return 0;

err:
	dev_err(dev, "Oops, 'acpi_handle' corrupt\n");
	return -EINVAL;
}
EXPORT_SYMBOL_GPL(acpi_unbind_one);

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 LT	33	#define PHYSICAL_NODE_STRING "physical_node"
1033f904 LT	34
4e10d12a DSL	35	int register_acpi_bus_type(struct acpi_bus_type *type)
	36	{
	37	if (acpi_disabled)
	38	return -ENODEV;
53540098	39	if (type && type->match && type->find_device) {
4e10d12a DSL	40	down_write(&bus_type_sem);
	41	list_add_tail(&type->list, &bus_type_list);
	42	up_write(&bus_type_sem);
53540098	43	printk(KERN_INFO PREFIX "bus type %s registered\n", type->name);
4e10d12a DSL	44	return 0;
	45	}
	46	return -ENODEV;
	47	}
91e4d5a1	48	EXPORT_SYMBOL_GPL(register_acpi_bus_type);
4e10d12a	49
4e10d12a DSL	50	int unregister_acpi_bus_type(struct acpi_bus_type *type)
	51	{
	52	if (acpi_disabled)
	53	return 0;
	54	if (type) {
	55	down_write(&bus_type_sem);
	56	list_del_init(&type->list);
	57	up_write(&bus_type_sem);
53540098 RW	58	printk(KERN_INFO PREFIX "bus type %s unregistered\n",
53540098 RW	59	type->name);
4e10d12a DSL	60	return 0;
	61	}
	62	return -ENODEV;
	63	}
91e4d5a1	64	EXPORT_SYMBOL_GPL(unregister_acpi_bus_type);
4e10d12a	65
53540098	66	static struct acpi_bus_type acpi_get_bus_type(struct device dev)
4e10d12a DSL	67	{
	68	struct acpi_bus_type tmp, ret = NULL;
	69
	70	down_read(&bus_type_sem);
	71	list_for_each_entry(tmp, &bus_type_list, list) {
53540098	72	if (tmp->match(dev)) {
4e10d12a DSL	73	ret = tmp;
	74	break;
	75	}
	76	}
	77	up_read(&bus_type_sem);
	78	return ret;
	79	}
	80
33f767d7 RW	81	static acpi_status do_acpi_find_child(acpi_handle handle, u32 lvl_not_used,
33f767d7 RW	82	void addr_p, void *ret_p)
4e10d12a	83	{
c7d9ca90	84	unsigned long long addr, sta;
4e10d12a	85	acpi_status status;
33f767d7 RW	86
	87	status = acpi_evaluate_integer(handle, METHOD_NAME__ADR, NULL, &addr);
	88	if (ACPI_SUCCESS(status) && addr == ((u64 )addr_p)) {
	89	*ret_p = handle;
c7d9ca90 JW	90	status = acpi_bus_get_status_handle(handle, &sta);
	91	if (ACPI_SUCCESS(status) && (sta & ACPI_STA_DEVICE_ENABLED))
	92	return AE_CTRL_TERMINATE;
4e10d12a DSL	93	}
	94	return AE_OK;
	95	}
	96
439913ff	97	acpi_handle acpi_get_child(acpi_handle parent, u64 address)
4e10d12a	98	{
33f767d7	99	void *ret = NULL;
4e10d12a DSL	100
	101	if (!parent)
	102	return NULL;
4e10d12a	103
33f767d7 RW	104	acpi_walk_namespace(ACPI_TYPE_DEVICE, parent, 1, NULL,
	105	do_acpi_find_child, &address, &ret);
	106	return (acpi_handle)ret;
	107	}
4e10d12a DSL	108	EXPORT_SYMBOL(acpi_get_child);
4e10d12a DSL	109
ac212b69	110	int acpi_bind_one(struct device *dev, acpi_handle handle)
4e10d12a	111	{
1071695f	112	struct acpi_device *acpi_dev;
4e10d12a	113	acpi_status status;
f3fd0c8a	114	struct acpi_device_physical_node physical_node, pn;
1033f904 LT	115	char physical_node_name[sizeof(PHYSICAL_NODE_STRING) + 2];
1033f904 LT	116	int retval = -EINVAL;
4e10d12a	117
95f8a082	118	if (ACPI_HANDLE(dev)) {
f3fd0c8a RW	119	if (handle) {
	120	dev_warn(dev, "ACPI handle is already set\n");
	121	return -EINVAL;
	122	} else {
95f8a082	123	handle = ACPI_HANDLE(dev);
f3fd0c8a	124	}
4e10d12a	125	}
f3fd0c8a RW	126	if (!handle)
f3fd0c8a RW	127	return -EINVAL;
1033f904	128
4e10d12a	129	get_device(dev);
1033f904 LT	130	status = acpi_bus_get_device(handle, &acpi_dev);
	131	if (ACPI_FAILURE(status))
	132	goto err;
	133
f3fd0c8a	134	physical_node = kzalloc(sizeof(*physical_node), GFP_KERNEL);
1033f904 LT	135	if (!physical_node) {
	136	retval = -ENOMEM;
	137	goto err;
4e10d12a	138	}
4e10d12a	139
1033f904	140	mutex_lock(&acpi_dev->physical_node_lock);
f3fd0c8a RW	141
	142	/* Sanity check. */
	143	list_for_each_entry(pn, &acpi_dev->physical_node_list, node)
	144	if (pn->dev == dev) {
	145	dev_warn(dev, "Already associated with ACPI node\n");
	146	goto err_free;
	147	}
	148
1033f904 LT	149	/* allocate physical node id according to physical_node_id_bitmap */
	150	physical_node->node_id =
	151	find_first_zero_bit(acpi_dev->physical_node_id_bitmap,
	152	ACPI_MAX_PHYSICAL_NODE);
	153	if (physical_node->node_id >= ACPI_MAX_PHYSICAL_NODE) {
	154	retval = -ENOSPC;
f3fd0c8a	155	goto err_free;
1071695f DB	156	}
1071695f DB	157
1033f904 LT	158	set_bit(physical_node->node_id, acpi_dev->physical_node_id_bitmap);
	159	physical_node->dev = dev;
	160	list_add_tail(&physical_node->node, &acpi_dev->physical_node_list);
	161	acpi_dev->physical_node_count++;
f3fd0c8a	162
1033f904 LT	163	mutex_unlock(&acpi_dev->physical_node_lock);
1033f904 LT	164
95f8a082 RW	165	if (!ACPI_HANDLE(dev))
95f8a082 RW	166	ACPI_HANDLE_SET(dev, acpi_dev->handle);
1033f904 LT	167
	168	if (!physical_node->node_id)
	169	strcpy(physical_node_name, PHYSICAL_NODE_STRING);
	170	else
	171	sprintf(physical_node_name,
	172	"physical_node%d", physical_node->node_id);
	173	retval = sysfs_create_link(&acpi_dev->dev.kobj, &dev->kobj,
	174	physical_node_name);
	175	retval = sysfs_create_link(&dev->kobj, &acpi_dev->dev.kobj,
	176	"firmware_node");
	177
	178	if (acpi_dev->wakeup.flags.valid)
	179	device_set_wakeup_capable(dev, true);
	180
4e10d12a	181	return 0;
1033f904 LT	182
1033f904 LT	183	err:
95f8a082	184	ACPI_HANDLE_SET(dev, NULL);
1033f904 LT	185	put_device(dev);
1033f904 LT	186	return retval;
f3fd0c8a RW	187
	188	err_free:
	189	mutex_unlock(&acpi_dev->physical_node_lock);
	190	kfree(physical_node);
	191	goto err;
4e10d12a	192	}
ac212b69	193	EXPORT_SYMBOL_GPL(acpi_bind_one);
4e10d12a	194
ac212b69	195	int acpi_unbind_one(struct device *dev)
4e10d12a	196	{
1033f904 LT	197	struct acpi_device_physical_node *entry;
	198	struct acpi_device *acpi_dev;
	199	acpi_status status;
	200	struct list_head node, next;
	201
95f8a082	202	if (!ACPI_HANDLE(dev))
4e10d12a	203	return 0;
1071695f	204
95f8a082	205	status = acpi_bus_get_device(ACPI_HANDLE(dev), &acpi_dev);
1033f904 LT	206	if (ACPI_FAILURE(status))
1033f904 LT	207	goto err;
1071695f	208
1033f904 LT	209	mutex_lock(&acpi_dev->physical_node_lock);
	210	list_for_each_safe(node, next, &acpi_dev->physical_node_list) {
	211	char physical_node_name[sizeof(PHYSICAL_NODE_STRING) + 2];
	212
	213	entry = list_entry(node, struct acpi_device_physical_node,
	214	node);
	215	if (entry->dev != dev)
	216	continue;
	217
	218	list_del(node);
	219	clear_bit(entry->node_id, acpi_dev->physical_node_id_bitmap);
1071695f	220
1033f904 LT	221	acpi_dev->physical_node_count--;
	222
	223	if (!entry->node_id)
	224	strcpy(physical_node_name, PHYSICAL_NODE_STRING);
	225	else
	226	sprintf(physical_node_name,
	227	"physical_node%d", entry->node_id);
	228
	229	sysfs_remove_link(&acpi_dev->dev.kobj, physical_node_name);
	230	sysfs_remove_link(&dev->kobj, "firmware_node");
95f8a082	231	ACPI_HANDLE_SET(dev, NULL);
4e10d12a DSL	232	/* acpi_bind_one increase refcnt by one */
4e10d12a DSL	233	put_device(dev);
1033f904	234	kfree(entry);
4e10d12a	235	}
1033f904 LT	236	mutex_unlock(&acpi_dev->physical_node_lock);
1033f904 LT	237
4e10d12a	238	return 0;
1033f904 LT	239
	240	err:
	241	dev_err(dev, "Oops, 'acpi_handle' corrupt\n");
	242	return -EINVAL;
4e10d12a	243	}
ac212b69	244	EXPORT_SYMBOL_GPL(acpi_unbind_one);
4e10d12a DSL	245
	246	static int acpi_platform_notify(struct device *dev)
	247	{
53540098	248	struct acpi_bus_type *type = acpi_get_bus_type(dev);
4e10d12a	249	acpi_handle handle;
11909ca1	250	int ret;
4e10d12a	251
f3fd0c8a	252	ret = acpi_bind_one(dev, NULL);
92414481	253	if (ret && type) {
11909ca1 RW	254	ret = type->find_device(dev, &handle);
	255	if (ret) {
	256	DBG("Unable to get handle for %s\n", dev_name(dev));
	257	goto out;
	258	}
	259	ret = acpi_bind_one(dev, handle);
	260	if (ret)
	261	goto out;
4e10d12a	262	}
11909ca1 RW	263
	264	if (type && type->setup)
	265	type->setup(dev);
4e10d12a	266
f3fd0c8a	267	out:
4e10d12a DSL	268	#if ACPI_GLUE_DEBUG
	269	if (!ret) {
	270	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
	271
a412a11d	272	acpi_get_name(ACPI_HANDLE(dev), ACPI_FULL_PATHNAME, &buffer);
db1461ad	273	DBG("Device %s -> %s\n", dev_name(dev), (char *)buffer.pointer);
02438d87	274	kfree(buffer.pointer);
4e10d12a	275	} else
db1461ad	276	DBG("Device %s -> No ACPI support\n", dev_name(dev));
4e10d12a DSL	277	#endif
	278
	279	return ret;
	280	}
	281
	282	static int acpi_platform_notify_remove(struct device *dev)
	283	{
11909ca1 RW	284	struct acpi_bus_type *type;
11909ca1 RW	285
53540098	286	type = acpi_get_bus_type(dev);
11909ca1 RW	287	if (type && type->cleanup)
	288	type->cleanup(dev);
	289
4e10d12a DSL	290	acpi_unbind_one(dev);
	291	return 0;
	292	}
	293
0e46517d	294	int __init init_acpi_device_notify(void)
4e10d12a	295	{
4e10d12a DSL	296	if (platform_notify \|\| platform_notify_remove) {
	297	printk(KERN_ERR PREFIX "Can't use platform_notify\n");
	298	return 0;
	299	}
	300	platform_notify = acpi_platform_notify;
	301	platform_notify_remove = acpi_platform_notify_remove;
	302	return 0;
	303	}