[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 int acpi_find_bridge_device(struct device *dev, acpi_handle * handle)
{
	struct acpi_bus_type *tmp;
	int ret = -ENODEV;

	down_read(&bus_type_sem);
	list_for_each_entry(tmp, &bus_type_list, list) {
		if (tmp->find_bridge && !tmp->find_bridge(dev, handle)) {
			ret = 0;
			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;
	acpi_status status;

	status = acpi_evaluate_integer(handle, METHOD_NAME__ADR, NULL, &addr);
	if (ACPI_SUCCESS(status) && addr == *((u64 *)addr_p)) {
		*ret_p = handle;
		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);

static 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;
}

static 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;
}

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) {
		if (!type) {
			ret = acpi_find_bridge_device(dev, &handle);
			if (!ret)
				ret = acpi_bind_one(dev, handle);

			goto out;
		}

		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
	81	static int acpi_find_bridge_device(struct device dev, acpi_handle handle)
	82	{
	83	struct acpi_bus_type *tmp;
	84	int ret = -ENODEV;
	85
	86	down_read(&bus_type_sem);
	87	list_for_each_entry(tmp, &bus_type_list, list) {
	88	if (tmp->find_bridge && !tmp->find_bridge(dev, handle)) {
	89	ret = 0;
	90	break;
	91	}
	92	}
	93	up_read(&bus_type_sem);
	94	return ret;
	95	}
	96
33f767d7 RW	97	static acpi_status do_acpi_find_child(acpi_handle handle, u32 lvl_not_used,
33f767d7 RW	98	void addr_p, void *ret_p)
4e10d12a	99	{
33f767d7	100	unsigned long long addr;
4e10d12a	101	acpi_status status;
33f767d7 RW	102
	103	status = acpi_evaluate_integer(handle, METHOD_NAME__ADR, NULL, &addr);
	104	if (ACPI_SUCCESS(status) && addr == ((u64 )addr_p)) {
	105	*ret_p = handle;
	106	return AE_CTRL_TERMINATE;
4e10d12a DSL	107	}
	108	return AE_OK;
	109	}
	110
439913ff	111	acpi_handle acpi_get_child(acpi_handle parent, u64 address)
4e10d12a	112	{
33f767d7	113	void *ret = NULL;
4e10d12a DSL	114
	115	if (!parent)
	116	return NULL;
4e10d12a	117
33f767d7 RW	118	acpi_walk_namespace(ACPI_TYPE_DEVICE, parent, 1, NULL,
	119	do_acpi_find_child, &address, &ret);
	120	return (acpi_handle)ret;
	121	}
4e10d12a DSL	122	EXPORT_SYMBOL(acpi_get_child);
4e10d12a DSL	123
4e10d12a DSL	124	static int acpi_bind_one(struct device *dev, acpi_handle handle)
4e10d12a DSL	125	{
1071695f	126	struct acpi_device *acpi_dev;
4e10d12a	127	acpi_status status;
f3fd0c8a	128	struct acpi_device_physical_node physical_node, pn;
1033f904 LT	129	char physical_node_name[sizeof(PHYSICAL_NODE_STRING) + 2];
1033f904 LT	130	int retval = -EINVAL;
4e10d12a	131
95f8a082	132	if (ACPI_HANDLE(dev)) {
f3fd0c8a RW	133	if (handle) {
	134	dev_warn(dev, "ACPI handle is already set\n");
	135	return -EINVAL;
	136	} else {
95f8a082	137	handle = ACPI_HANDLE(dev);
f3fd0c8a	138	}
4e10d12a	139	}
f3fd0c8a RW	140	if (!handle)
f3fd0c8a RW	141	return -EINVAL;
1033f904	142
4e10d12a	143	get_device(dev);
1033f904 LT	144	status = acpi_bus_get_device(handle, &acpi_dev);
	145	if (ACPI_FAILURE(status))
	146	goto err;
	147
f3fd0c8a	148	physical_node = kzalloc(sizeof(*physical_node), GFP_KERNEL);
1033f904 LT	149	if (!physical_node) {
	150	retval = -ENOMEM;
	151	goto err;
4e10d12a	152	}
4e10d12a	153
1033f904	154	mutex_lock(&acpi_dev->physical_node_lock);
f3fd0c8a RW	155
	156	/* Sanity check. */
	157	list_for_each_entry(pn, &acpi_dev->physical_node_list, node)
	158	if (pn->dev == dev) {
	159	dev_warn(dev, "Already associated with ACPI node\n");
	160	goto err_free;
	161	}
	162
1033f904 LT	163	/* allocate physical node id according to physical_node_id_bitmap */
	164	physical_node->node_id =
	165	find_first_zero_bit(acpi_dev->physical_node_id_bitmap,
	166	ACPI_MAX_PHYSICAL_NODE);
	167	if (physical_node->node_id >= ACPI_MAX_PHYSICAL_NODE) {
	168	retval = -ENOSPC;
f3fd0c8a	169	goto err_free;
1071695f DB	170	}
1071695f DB	171
1033f904 LT	172	set_bit(physical_node->node_id, acpi_dev->physical_node_id_bitmap);
	173	physical_node->dev = dev;
	174	list_add_tail(&physical_node->node, &acpi_dev->physical_node_list);
	175	acpi_dev->physical_node_count++;
f3fd0c8a	176
1033f904 LT	177	mutex_unlock(&acpi_dev->physical_node_lock);
1033f904 LT	178
95f8a082 RW	179	if (!ACPI_HANDLE(dev))
95f8a082 RW	180	ACPI_HANDLE_SET(dev, acpi_dev->handle);
1033f904 LT	181
	182	if (!physical_node->node_id)
	183	strcpy(physical_node_name, PHYSICAL_NODE_STRING);
	184	else
	185	sprintf(physical_node_name,
	186	"physical_node%d", physical_node->node_id);
	187	retval = sysfs_create_link(&acpi_dev->dev.kobj, &dev->kobj,
	188	physical_node_name);
	189	retval = sysfs_create_link(&dev->kobj, &acpi_dev->dev.kobj,
	190	"firmware_node");
	191
	192	if (acpi_dev->wakeup.flags.valid)
	193	device_set_wakeup_capable(dev, true);
	194
4e10d12a	195	return 0;
1033f904 LT	196
1033f904 LT	197	err:
95f8a082	198	ACPI_HANDLE_SET(dev, NULL);
1033f904 LT	199	put_device(dev);
1033f904 LT	200	return retval;
f3fd0c8a RW	201
	202	err_free:
	203	mutex_unlock(&acpi_dev->physical_node_lock);
	204	kfree(physical_node);
	205	goto err;
4e10d12a DSL	206	}
	207
	208	static int acpi_unbind_one(struct device *dev)
	209	{
1033f904 LT	210	struct acpi_device_physical_node *entry;
	211	struct acpi_device *acpi_dev;
	212	acpi_status status;
	213	struct list_head node, next;
	214
95f8a082	215	if (!ACPI_HANDLE(dev))
4e10d12a	216	return 0;
1071695f	217
95f8a082	218	status = acpi_bus_get_device(ACPI_HANDLE(dev), &acpi_dev);
1033f904 LT	219	if (ACPI_FAILURE(status))
1033f904 LT	220	goto err;
1071695f	221
1033f904 LT	222	mutex_lock(&acpi_dev->physical_node_lock);
	223	list_for_each_safe(node, next, &acpi_dev->physical_node_list) {
	224	char physical_node_name[sizeof(PHYSICAL_NODE_STRING) + 2];
	225
	226	entry = list_entry(node, struct acpi_device_physical_node,
	227	node);
	228	if (entry->dev != dev)
	229	continue;
	230
	231	list_del(node);
	232	clear_bit(entry->node_id, acpi_dev->physical_node_id_bitmap);
1071695f	233
1033f904 LT	234	acpi_dev->physical_node_count--;
	235
	236	if (!entry->node_id)
	237	strcpy(physical_node_name, PHYSICAL_NODE_STRING);
	238	else
	239	sprintf(physical_node_name,
	240	"physical_node%d", entry->node_id);
	241
	242	sysfs_remove_link(&acpi_dev->dev.kobj, physical_node_name);
	243	sysfs_remove_link(&dev->kobj, "firmware_node");
95f8a082	244	ACPI_HANDLE_SET(dev, NULL);
4e10d12a DSL	245	/* acpi_bind_one increase refcnt by one */
4e10d12a DSL	246	put_device(dev);
1033f904	247	kfree(entry);
4e10d12a	248	}
1033f904 LT	249	mutex_unlock(&acpi_dev->physical_node_lock);
1033f904 LT	250
4e10d12a	251	return 0;
1033f904 LT	252
	253	err:
	254	dev_err(dev, "Oops, 'acpi_handle' corrupt\n");
	255	return -EINVAL;
4e10d12a DSL	256	}
	257
	258	static int acpi_platform_notify(struct device *dev)
	259	{
53540098	260	struct acpi_bus_type *type = acpi_get_bus_type(dev);
4e10d12a	261	acpi_handle handle;
11909ca1	262	int ret;
4e10d12a	263
f3fd0c8a	264	ret = acpi_bind_one(dev, NULL);
11909ca1	265	if (ret) {
53540098 RW	266	if (!type) {
	267	ret = acpi_find_bridge_device(dev, &handle);
	268	if (!ret)
	269	ret = acpi_bind_one(dev, handle);
	270
11909ca1 RW	271	goto out;
	272	}
	273
	274	ret = type->find_device(dev, &handle);
	275	if (ret) {
	276	DBG("Unable to get handle for %s\n", dev_name(dev));
	277	goto out;
	278	}
	279	ret = acpi_bind_one(dev, handle);
	280	if (ret)
	281	goto out;
4e10d12a	282	}
11909ca1 RW	283
	284	if (type && type->setup)
	285	type->setup(dev);
4e10d12a	286
f3fd0c8a	287	out:
4e10d12a DSL	288	#if ACPI_GLUE_DEBUG
	289	if (!ret) {
	290	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
	291
a412a11d	292	acpi_get_name(ACPI_HANDLE(dev), ACPI_FULL_PATHNAME, &buffer);
db1461ad	293	DBG("Device %s -> %s\n", dev_name(dev), (char *)buffer.pointer);
02438d87	294	kfree(buffer.pointer);
4e10d12a	295	} else
db1461ad	296	DBG("Device %s -> No ACPI support\n", dev_name(dev));
4e10d12a DSL	297	#endif
	298
	299	return ret;
	300	}
	301
	302	static int acpi_platform_notify_remove(struct device *dev)
	303	{
11909ca1 RW	304	struct acpi_bus_type *type;
11909ca1 RW	305
53540098	306	type = acpi_get_bus_type(dev);
11909ca1 RW	307	if (type && type->cleanup)
	308	type->cleanup(dev);
	309
4e10d12a DSL	310	acpi_unbind_one(dev);
	311	return 0;
	312	}
	313
0e46517d	314	int __init init_acpi_device_notify(void)
4e10d12a	315	{
4e10d12a DSL	316	if (platform_notify \|\| platform_notify_remove) {
	317	printk(KERN_ERR PREFIX "Can't use platform_notify\n");
	318	return 0;
	319	}
	320	platform_notify = acpi_platform_notify;
	321	platform_notify_remove = acpi_platform_notify_remove;
	322	return 0;
	323	}