[mirror_ubuntu-artful-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/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;
}
EXPORT_SYMBOL(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 "ACPI bus type %s unregistered\n",
		       type->bus->name);
		return 0;
	}
	return -ENODEV;
}
EXPORT_SYMBOL(unregister_acpi_bus_type);

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	}
6b66d958	42	EXPORT_SYMBOL(register_acpi_bus_type);
4e10d12a	43
4e10d12a DSL	44	int unregister_acpi_bus_type(struct acpi_bus_type *type)
	45	{
	46	if (acpi_disabled)
	47	return 0;
	48	if (type) {
	49	down_write(&bus_type_sem);
	50	list_del_init(&type->list);
	51	up_write(&bus_type_sem);
4be44fcd LB	52	printk(KERN_INFO PREFIX "ACPI bus type %s unregistered\n",
4be44fcd LB	53	type->bus->name);
4e10d12a DSL	54	return 0;
	55	}
	56	return -ENODEV;
	57	}
6b66d958	58	EXPORT_SYMBOL(unregister_acpi_bus_type);
4e10d12a	59
4e10d12a DSL	60	static struct acpi_bus_type acpi_get_bus_type(struct bus_type type)
	61	{
	62	struct acpi_bus_type tmp, ret = NULL;
	63
	64	down_read(&bus_type_sem);
	65	list_for_each_entry(tmp, &bus_type_list, list) {
	66	if (tmp->bus == type) {
	67	ret = tmp;
	68	break;
	69	}
	70	}
	71	up_read(&bus_type_sem);
	72	return ret;
	73	}
	74
	75	static int acpi_find_bridge_device(struct device dev, acpi_handle handle)
	76	{
	77	struct acpi_bus_type *tmp;
	78	int ret = -ENODEV;
	79
	80	down_read(&bus_type_sem);
	81	list_for_each_entry(tmp, &bus_type_list, list) {
	82	if (tmp->find_bridge && !tmp->find_bridge(dev, handle)) {
	83	ret = 0;
	84	break;
	85	}
	86	}
	87	up_read(&bus_type_sem);
	88	return ret;
	89	}
	90
4e10d12a DSL	91	/* Get device's handler per its address under its parent */
	92	struct acpi_find_child {
	93	acpi_handle handle;
439913ff	94	u64 address;
4e10d12a DSL	95	};
	96
	97	static acpi_status
	98	do_acpi_find_child(acpi_handle handle, u32 lvl, void context, void *rv)
	99	{
	100	acpi_status status;
	101	struct acpi_device_info *info;
50dd0969	102	struct acpi_find_child *find = context;
4e10d12a	103
15b8dd53	104	status = acpi_get_object_info(handle, &info);
4e10d12a	105	if (ACPI_SUCCESS(status)) {
108029ff ZY	106	if ((info->address == find->address)
108029ff ZY	107	&& (info->valid & ACPI_VALID_ADR))
4e10d12a	108	find->handle = handle;
15b8dd53	109	kfree(info);
4e10d12a DSL	110	}
	111	return AE_OK;
	112	}
	113
439913ff	114	acpi_handle acpi_get_child(acpi_handle parent, u64 address)
4e10d12a DSL	115	{
	116	struct acpi_find_child find = { NULL, address };
	117
	118	if (!parent)
	119	return NULL;
	120	acpi_walk_namespace(ACPI_TYPE_DEVICE, parent,
2263576c	121	1, do_acpi_find_child, NULL, &find, NULL);
4e10d12a DSL	122	return find.handle;
	123	}
	124
	125	EXPORT_SYMBOL(acpi_get_child);
	126
	127	/* Link ACPI devices with physical devices */
	128	static void acpi_glue_data_handler(acpi_handle handle,
8e4319c4	129	void *context)
4e10d12a DSL	130	{
	131	/* we provide an empty handler */
	132	}
	133
	134	/* Note: a success call will increase reference count by one */
	135	struct device *acpi_get_physical_device(acpi_handle handle)
	136	{
	137	acpi_status status;
	138	struct device *dev;
	139
	140	status = acpi_get_data(handle, acpi_glue_data_handler, (void **)&dev);
	141	if (ACPI_SUCCESS(status))
	142	return get_device(dev);
	143	return NULL;
	144	}
	145
	146	EXPORT_SYMBOL(acpi_get_physical_device);
	147
	148	static int acpi_bind_one(struct device *dev, acpi_handle handle)
	149	{
1071695f	150	struct acpi_device *acpi_dev;
4e10d12a DSL	151	acpi_status status;
4e10d12a DSL	152
465ae641	153	if (dev->archdata.acpi_handle) {
fc3a8828	154	dev_warn(dev, "Drivers changed 'acpi_handle'\n");
4e10d12a DSL	155	return -EINVAL;
	156	}
	157	get_device(dev);
	158	status = acpi_attach_data(handle, acpi_glue_data_handler, dev);
	159	if (ACPI_FAILURE(status)) {
	160	put_device(dev);
	161	return -EINVAL;
	162	}
465ae641	163	dev->archdata.acpi_handle = handle;
4e10d12a	164
1071695f DB	165	status = acpi_bus_get_device(handle, &acpi_dev);
	166	if (!ACPI_FAILURE(status)) {
	167	int ret;
	168
	169	ret = sysfs_create_link(&dev->kobj, &acpi_dev->dev.kobj,
	170	"firmware_node");
	171	ret = sysfs_create_link(&acpi_dev->dev.kobj, &dev->kobj,
	172	"physical_node");
7fa69baf	173	if (acpi_dev->wakeup.flags.valid)
eb9d0fe4	174	device_set_wakeup_capable(dev, true);
1071695f DB	175	}
1071695f DB	176
4e10d12a DSL	177	return 0;
	178	}
	179
	180	static int acpi_unbind_one(struct device *dev)
	181	{
465ae641	182	if (!dev->archdata.acpi_handle)
4e10d12a	183	return 0;
465ae641	184	if (dev == acpi_get_physical_device(dev->archdata.acpi_handle)) {
1071695f DB	185	struct acpi_device *acpi_dev;
1071695f DB	186
4e10d12a DSL	187	/* acpi_get_physical_device increase refcnt by one */
4e10d12a DSL	188	put_device(dev);
1071695f DB	189
	190	if (!acpi_bus_get_device(dev->archdata.acpi_handle,
	191	&acpi_dev)) {
	192	sysfs_remove_link(&dev->kobj, "firmware_node");
	193	sysfs_remove_link(&acpi_dev->dev.kobj, "physical_node");
	194	}
	195
465ae641 BH	196	acpi_detach_data(dev->archdata.acpi_handle,
	197	acpi_glue_data_handler);
	198	dev->archdata.acpi_handle = NULL;
4e10d12a DSL	199	/* acpi_bind_one increase refcnt by one */
	200	put_device(dev);
	201	} else {
fc3a8828	202	dev_err(dev, "Oops, 'acpi_handle' corrupt\n");
4e10d12a DSL	203	}
	204	return 0;
	205	}
	206
	207	static int acpi_platform_notify(struct device *dev)
	208	{
	209	struct acpi_bus_type *type;
	210	acpi_handle handle;
	211	int ret = -EINVAL;
	212
	213	if (!dev->bus \|\| !dev->parent) {
	214	/* bridge devices genernally haven't bus or parent */
	215	ret = acpi_find_bridge_device(dev, &handle);
	216	goto end;
	217	}
	218	type = acpi_get_bus_type(dev->bus);
	219	if (!type) {
db1461ad	220	DBG("No ACPI bus support for %s\n", dev_name(dev));
4e10d12a DSL	221	ret = -EINVAL;
	222	goto end;
	223	}
	224	if ((ret = type->find_device(dev, &handle)) != 0)
db1461ad	225	DBG("Can't get handler for %s\n", dev_name(dev));
4e10d12a DSL	226	end:
	227	if (!ret)
	228	acpi_bind_one(dev, handle);
	229
	230	#if ACPI_GLUE_DEBUG
	231	if (!ret) {
	232	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
	233
465ae641 BH	234	acpi_get_name(dev->archdata.acpi_handle,
465ae641 BH	235	ACPI_FULL_PATHNAME, &buffer);
db1461ad	236	DBG("Device %s -> %s\n", dev_name(dev), (char *)buffer.pointer);
02438d87	237	kfree(buffer.pointer);
4e10d12a	238	} else
db1461ad	239	DBG("Device %s -> No ACPI support\n", dev_name(dev));
4e10d12a DSL	240	#endif
	241
	242	return ret;
	243	}
	244
	245	static int acpi_platform_notify_remove(struct device *dev)
	246	{
	247	acpi_unbind_one(dev);
	248	return 0;
	249	}
	250
0e46517d	251	int __init init_acpi_device_notify(void)
4e10d12a	252	{
4e10d12a DSL	253	if (platform_notify \|\| platform_notify_remove) {
	254	printk(KERN_ERR PREFIX "Can't use platform_notify\n");
	255	return 0;
	256	}
	257	platform_notify = acpi_platform_notify;
	258	platform_notify_remove = acpi_platform_notify_remove;
	259	return 0;
	260	}