[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(x...) printk(PREFIX x)
#else
#define DBG(x...) do { } while(0)
#endif
static LIST_HEAD(bus_type_list);
static DECLARE_RWSEM(bus_type_sem);

int register_acpi_bus_type(struct acpi_bus_type *type)
{
	if (acpi_disabled)
		return -ENODEV;
	if (type && type->bus && 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->bus->name);
		return 0;
	}
	return -ENODEV;
}

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 "ACPI bus type %s unregistered\n",
		       type->bus->name);
		return 0;
	}
	return -ENODEV;
}

static struct acpi_bus_type *acpi_get_bus_type(struct bus_type *type)
{
	struct acpi_bus_type *tmp, *ret = NULL;

	down_read(&bus_type_sem);
	list_for_each_entry(tmp, &bus_type_list, list) {
		if (tmp->bus == type) {
			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;
}

/* Get device's handler per its address under its parent */
struct acpi_find_child {
	acpi_handle handle;
	u64 address;
};

static acpi_status
do_acpi_find_child(acpi_handle handle, u32 lvl, void *context, void **rv)
{
	acpi_status status;
	struct acpi_device_info *info;
	struct acpi_find_child *find = context;

	status = acpi_get_object_info(handle, &info);
	if (ACPI_SUCCESS(status)) {
		if ((info->address == find->address)
			&& (info->valid & ACPI_VALID_ADR))
			find->handle = handle;
		kfree(info);
	}
	return AE_OK;
}

acpi_handle acpi_get_child(acpi_handle parent, u64 address)
{
	struct acpi_find_child find = { NULL, address };

	if (!parent)
		return NULL;
	acpi_walk_namespace(ACPI_TYPE_DEVICE, parent,
			    1, do_acpi_find_child, NULL, &find, NULL);
	return find.handle;
}

EXPORT_SYMBOL(acpi_get_child);

/* Link ACPI devices with physical devices */
static void acpi_glue_data_handler(acpi_handle handle,
				   void *context)
{
	/* we provide an empty handler */
}

/* Note: a success call will increase reference count by one */
struct device *acpi_get_physical_device(acpi_handle handle)
{
	acpi_status status;
	struct device *dev;

	status = acpi_get_data(handle, acpi_glue_data_handler, (void **)&dev);
	if (ACPI_SUCCESS(status))
		return get_device(dev);
	return NULL;
}

EXPORT_SYMBOL(acpi_get_physical_device);

static int acpi_bind_one(struct device *dev, acpi_handle handle)
{
	struct acpi_device *acpi_dev;
	acpi_status status;

	if (dev->archdata.acpi_handle) {
		dev_warn(dev, "Drivers changed 'acpi_handle'\n");
		return -EINVAL;
	}
	get_device(dev);
	status = acpi_attach_data(handle, acpi_glue_data_handler, dev);
	if (ACPI_FAILURE(status)) {
		put_device(dev);
		return -EINVAL;
	}
	dev->archdata.acpi_handle = handle;

	status = acpi_bus_get_device(handle, &acpi_dev);
	if (!ACPI_FAILURE(status)) {
		int ret;

		ret = sysfs_create_link(&dev->kobj, &acpi_dev->dev.kobj,
				"firmware_node");
		ret = sysfs_create_link(&acpi_dev->dev.kobj, &dev->kobj,
				"physical_node");
		if (acpi_dev->wakeup.flags.valid)
			device_set_wakeup_capable(dev, true);
	}

	return 0;
}

static int acpi_unbind_one(struct device *dev)
{
	if (!dev->archdata.acpi_handle)
		return 0;
	if (dev == acpi_get_physical_device(dev->archdata.acpi_handle)) {
		struct acpi_device *acpi_dev;

		/* acpi_get_physical_device increase refcnt by one */
		put_device(dev);

		if (!acpi_bus_get_device(dev->archdata.acpi_handle,
					&acpi_dev)) {
			sysfs_remove_link(&dev->kobj, "firmware_node");
			sysfs_remove_link(&acpi_dev->dev.kobj, "physical_node");
		}

		acpi_detach_data(dev->archdata.acpi_handle,
				 acpi_glue_data_handler);
		dev->archdata.acpi_handle = NULL;
		/* acpi_bind_one increase refcnt by one */
		put_device(dev);
	} else {
		dev_err(dev, "Oops, 'acpi_handle' corrupt\n");
	}
	return 0;
}

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

	if (!dev->bus || !dev->parent) {
		/* bridge devices genernally haven't bus or parent */
		ret = acpi_find_bridge_device(dev, &handle);
		goto end;
	}
	type = acpi_get_bus_type(dev->bus);
	if (!type) {
		DBG("No ACPI bus support for %s\n", dev_name(dev));
		ret = -EINVAL;
		goto end;
	}
	if ((ret = type->find_device(dev, &handle)) != 0)
		DBG("Can't get handler for %s\n", dev_name(dev));
      end:
	if (!ret)
		acpi_bind_one(dev, handle);

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

		acpi_get_name(dev->archdata.acpi_handle,
			      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)
{
	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
	20	#if ACPI_GLUE_DEBUG
	21	#define DBG(x...) printk(PREFIX x)
	22	#else
4ebf83c8	23	#define DBG(x...) do { } while(0)
4e10d12a DSL	24	#endif
	25	static LIST_HEAD(bus_type_list);
	26	static DECLARE_RWSEM(bus_type_sem);
	27
	28	int register_acpi_bus_type(struct acpi_bus_type *type)
	29	{
	30	if (acpi_disabled)
	31	return -ENODEV;
	32	if (type && type->bus && type->find_device) {
	33	down_write(&bus_type_sem);
	34	list_add_tail(&type->list, &bus_type_list);
	35	up_write(&bus_type_sem);
4be44fcd LB	36	printk(KERN_INFO PREFIX "bus type %s registered\n",
4be44fcd LB	37	type->bus->name);
4e10d12a DSL	38	return 0;
	39	}
	40	return -ENODEV;
	41	}
	42
4e10d12a DSL	43	int unregister_acpi_bus_type(struct acpi_bus_type *type)
	44	{
	45	if (acpi_disabled)
	46	return 0;
	47	if (type) {
	48	down_write(&bus_type_sem);
	49	list_del_init(&type->list);
	50	up_write(&bus_type_sem);
4be44fcd LB	51	printk(KERN_INFO PREFIX "ACPI bus type %s unregistered\n",
4be44fcd LB	52	type->bus->name);
4e10d12a DSL	53	return 0;
	54	}
	55	return -ENODEV;
	56	}
	57
4e10d12a DSL	58	static struct acpi_bus_type acpi_get_bus_type(struct bus_type type)
	59	{
	60	struct acpi_bus_type tmp, ret = NULL;
	61
	62	down_read(&bus_type_sem);
	63	list_for_each_entry(tmp, &bus_type_list, list) {
	64	if (tmp->bus == type) {
	65	ret = tmp;
	66	break;
	67	}
	68	}
	69	up_read(&bus_type_sem);
	70	return ret;
	71	}
	72
	73	static int acpi_find_bridge_device(struct device dev, acpi_handle handle)
	74	{
	75	struct acpi_bus_type *tmp;
	76	int ret = -ENODEV;
	77
	78	down_read(&bus_type_sem);
	79	list_for_each_entry(tmp, &bus_type_list, list) {
	80	if (tmp->find_bridge && !tmp->find_bridge(dev, handle)) {
	81	ret = 0;
	82	break;
	83	}
	84	}
	85	up_read(&bus_type_sem);
	86	return ret;
	87	}
	88
4e10d12a DSL	89	/* Get device's handler per its address under its parent */
	90	struct acpi_find_child {
	91	acpi_handle handle;
439913ff	92	u64 address;
4e10d12a DSL	93	};
	94
	95	static acpi_status
	96	do_acpi_find_child(acpi_handle handle, u32 lvl, void context, void *rv)
	97	{
	98	acpi_status status;
	99	struct acpi_device_info *info;
50dd0969	100	struct acpi_find_child *find = context;
4e10d12a	101
15b8dd53	102	status = acpi_get_object_info(handle, &info);
4e10d12a	103	if (ACPI_SUCCESS(status)) {
108029ff ZY	104	if ((info->address == find->address)
108029ff ZY	105	&& (info->valid & ACPI_VALID_ADR))
4e10d12a	106	find->handle = handle;
15b8dd53	107	kfree(info);
4e10d12a DSL	108	}
	109	return AE_OK;
	110	}
	111
439913ff	112	acpi_handle acpi_get_child(acpi_handle parent, u64 address)
4e10d12a DSL	113	{
	114	struct acpi_find_child find = { NULL, address };
	115
	116	if (!parent)
	117	return NULL;
	118	acpi_walk_namespace(ACPI_TYPE_DEVICE, parent,
2263576c	119	1, do_acpi_find_child, NULL, &find, NULL);
4e10d12a DSL	120	return find.handle;
	121	}
	122
	123	EXPORT_SYMBOL(acpi_get_child);
	124
	125	/* Link ACPI devices with physical devices */
	126	static void acpi_glue_data_handler(acpi_handle handle,
8e4319c4	127	void *context)
4e10d12a DSL	128	{
	129	/* we provide an empty handler */
	130	}
	131
	132	/* Note: a success call will increase reference count by one */
	133	struct device *acpi_get_physical_device(acpi_handle handle)
	134	{
	135	acpi_status status;
	136	struct device *dev;
	137
	138	status = acpi_get_data(handle, acpi_glue_data_handler, (void **)&dev);
	139	if (ACPI_SUCCESS(status))
	140	return get_device(dev);
	141	return NULL;
	142	}
	143
	144	EXPORT_SYMBOL(acpi_get_physical_device);
	145
	146	static int acpi_bind_one(struct device *dev, acpi_handle handle)
	147	{
1071695f	148	struct acpi_device *acpi_dev;
4e10d12a DSL	149	acpi_status status;
4e10d12a DSL	150
465ae641	151	if (dev->archdata.acpi_handle) {
fc3a8828	152	dev_warn(dev, "Drivers changed 'acpi_handle'\n");
4e10d12a DSL	153	return -EINVAL;
	154	}
	155	get_device(dev);
	156	status = acpi_attach_data(handle, acpi_glue_data_handler, dev);
	157	if (ACPI_FAILURE(status)) {
	158	put_device(dev);
	159	return -EINVAL;
	160	}
465ae641	161	dev->archdata.acpi_handle = handle;
4e10d12a	162
1071695f DB	163	status = acpi_bus_get_device(handle, &acpi_dev);
	164	if (!ACPI_FAILURE(status)) {
	165	int ret;
	166
	167	ret = sysfs_create_link(&dev->kobj, &acpi_dev->dev.kobj,
	168	"firmware_node");
	169	ret = sysfs_create_link(&acpi_dev->dev.kobj, &dev->kobj,
	170	"physical_node");
7fa69baf	171	if (acpi_dev->wakeup.flags.valid)
eb9d0fe4	172	device_set_wakeup_capable(dev, true);
1071695f DB	173	}
1071695f DB	174
4e10d12a DSL	175	return 0;
	176	}
	177
	178	static int acpi_unbind_one(struct device *dev)
	179	{
465ae641	180	if (!dev->archdata.acpi_handle)
4e10d12a	181	return 0;
465ae641	182	if (dev == acpi_get_physical_device(dev->archdata.acpi_handle)) {
1071695f DB	183	struct acpi_device *acpi_dev;
1071695f DB	184
4e10d12a DSL	185	/* acpi_get_physical_device increase refcnt by one */
4e10d12a DSL	186	put_device(dev);
1071695f DB	187
	188	if (!acpi_bus_get_device(dev->archdata.acpi_handle,
	189	&acpi_dev)) {
	190	sysfs_remove_link(&dev->kobj, "firmware_node");
	191	sysfs_remove_link(&acpi_dev->dev.kobj, "physical_node");
	192	}
	193
465ae641 BH	194	acpi_detach_data(dev->archdata.acpi_handle,
	195	acpi_glue_data_handler);
	196	dev->archdata.acpi_handle = NULL;
4e10d12a DSL	197	/* acpi_bind_one increase refcnt by one */
	198	put_device(dev);
	199	} else {
fc3a8828	200	dev_err(dev, "Oops, 'acpi_handle' corrupt\n");
4e10d12a DSL	201	}
	202	return 0;
	203	}
	204
	205	static int acpi_platform_notify(struct device *dev)
	206	{
	207	struct acpi_bus_type *type;
	208	acpi_handle handle;
	209	int ret = -EINVAL;
	210
	211	if (!dev->bus \|\| !dev->parent) {
	212	/* bridge devices genernally haven't bus or parent */
	213	ret = acpi_find_bridge_device(dev, &handle);
	214	goto end;
	215	}
	216	type = acpi_get_bus_type(dev->bus);
	217	if (!type) {
db1461ad	218	DBG("No ACPI bus support for %s\n", dev_name(dev));
4e10d12a DSL	219	ret = -EINVAL;
	220	goto end;
	221	}
	222	if ((ret = type->find_device(dev, &handle)) != 0)
db1461ad	223	DBG("Can't get handler for %s\n", dev_name(dev));
4e10d12a DSL	224	end:
	225	if (!ret)
	226	acpi_bind_one(dev, handle);
	227
	228	#if ACPI_GLUE_DEBUG
	229	if (!ret) {
	230	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
	231
465ae641 BH	232	acpi_get_name(dev->archdata.acpi_handle,
465ae641 BH	233	ACPI_FULL_PATHNAME, &buffer);
db1461ad	234	DBG("Device %s -> %s\n", dev_name(dev), (char *)buffer.pointer);
02438d87	235	kfree(buffer.pointer);
4e10d12a	236	} else
db1461ad	237	DBG("Device %s -> No ACPI support\n", dev_name(dev));
4e10d12a DSL	238	#endif
	239
	240	return ret;
	241	}
	242
	243	static int acpi_platform_notify_remove(struct device *dev)
	244	{
	245	acpi_unbind_one(dev);
	246	return 0;
	247	}
	248
0e46517d	249	int __init init_acpi_device_notify(void)
4e10d12a	250	{
4e10d12a DSL	251	if (platform_notify \|\| platform_notify_remove) {
	252	printk(KERN_ERR PREFIX "Can't use platform_notify\n");
	253	return 0;
	254	}
	255	platform_notify = acpi_platform_notify;
	256	platform_notify_remove = acpi_platform_notify_remove;
	257	return 0;
	258	}