[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/init.h>
#include <linux/list.h>
#include <linux/device.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;
	acpi_integer 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_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
	struct acpi_find_child *find = context;

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

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

	if (!parent)
		return NULL;
	acpi_walk_namespace(ACPI_TYPE_DEVICE, parent,
			    1, do_acpi_find_child, &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,
				   u32 function, 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);
			device_set_wakeup_enable(dev,
						acpi_dev->wakeup.state.enabled);
		}
	}

	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	*/
	9	#include <linux/init.h>
	10	#include <linux/list.h>
	11	#include <linux/device.h>
	12	#include <linux/rwsem.h>
	13	#include <linux/acpi.h>
	14
a192a958 LB	15	#include "internal.h"
a192a958 LB	16
4e10d12a DSL	17	#define ACPI_GLUE_DEBUG 0
	18	#if ACPI_GLUE_DEBUG
	19	#define DBG(x...) printk(PREFIX x)
	20	#else
4ebf83c8	21	#define DBG(x...) do { } while(0)
4e10d12a DSL	22	#endif
	23	static LIST_HEAD(bus_type_list);
	24	static DECLARE_RWSEM(bus_type_sem);
	25
	26	int register_acpi_bus_type(struct acpi_bus_type *type)
	27	{
	28	if (acpi_disabled)
	29	return -ENODEV;
	30	if (type && type->bus && type->find_device) {
	31	down_write(&bus_type_sem);
	32	list_add_tail(&type->list, &bus_type_list);
	33	up_write(&bus_type_sem);
4be44fcd LB	34	printk(KERN_INFO PREFIX "bus type %s registered\n",
4be44fcd LB	35	type->bus->name);
4e10d12a DSL	36	return 0;
	37	}
	38	return -ENODEV;
	39	}
	40
4e10d12a DSL	41	int unregister_acpi_bus_type(struct acpi_bus_type *type)
	42	{
	43	if (acpi_disabled)
	44	return 0;
	45	if (type) {
	46	down_write(&bus_type_sem);
	47	list_del_init(&type->list);
	48	up_write(&bus_type_sem);
4be44fcd LB	49	printk(KERN_INFO PREFIX "ACPI bus type %s unregistered\n",
4be44fcd LB	50	type->bus->name);
4e10d12a DSL	51	return 0;
	52	}
	53	return -ENODEV;
	54	}
	55
4e10d12a DSL	56	static struct acpi_bus_type acpi_get_bus_type(struct bus_type type)
	57	{
	58	struct acpi_bus_type tmp, ret = NULL;
	59
	60	down_read(&bus_type_sem);
	61	list_for_each_entry(tmp, &bus_type_list, list) {
	62	if (tmp->bus == type) {
	63	ret = tmp;
	64	break;
	65	}
	66	}
	67	up_read(&bus_type_sem);
	68	return ret;
	69	}
	70
	71	static int acpi_find_bridge_device(struct device dev, acpi_handle handle)
	72	{
	73	struct acpi_bus_type *tmp;
	74	int ret = -ENODEV;
	75
	76	down_read(&bus_type_sem);
	77	list_for_each_entry(tmp, &bus_type_list, list) {
	78	if (tmp->find_bridge && !tmp->find_bridge(dev, handle)) {
	79	ret = 0;
	80	break;
	81	}
	82	}
	83	up_read(&bus_type_sem);
	84	return ret;
	85	}
	86
4e10d12a DSL	87	/* Get device's handler per its address under its parent */
	88	struct acpi_find_child {
	89	acpi_handle handle;
	90	acpi_integer address;
	91	};
	92
	93	static acpi_status
	94	do_acpi_find_child(acpi_handle handle, u32 lvl, void context, void *rv)
	95	{
	96	acpi_status status;
	97	struct acpi_device_info *info;
	98	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
50dd0969	99	struct acpi_find_child *find = context;
4e10d12a DSL	100
	101	status = acpi_get_object_info(handle, &buffer);
	102	if (ACPI_SUCCESS(status)) {
	103	info = buffer.pointer;
	104	if (info->address == find->address)
	105	find->handle = handle;
02438d87	106	kfree(buffer.pointer);
4e10d12a DSL	107	}
	108	return AE_OK;
	109	}
	110
	111	acpi_handle acpi_get_child(acpi_handle parent, acpi_integer address)
	112	{
	113	struct acpi_find_child find = { NULL, address };
	114
	115	if (!parent)
	116	return NULL;
	117	acpi_walk_namespace(ACPI_TYPE_DEVICE, parent,
	118	1, do_acpi_find_child, &find, NULL);
	119	return find.handle;
	120	}
	121
	122	EXPORT_SYMBOL(acpi_get_child);
	123
	124	/* Link ACPI devices with physical devices */
	125	static void acpi_glue_data_handler(acpi_handle handle,
	126	u32 function, void *context)
	127	{
	128	/* we provide an empty handler */
	129	}
	130
	131	/* Note: a success call will increase reference count by one */
	132	struct device *acpi_get_physical_device(acpi_handle handle)
	133	{
	134	acpi_status status;
	135	struct device *dev;
	136
	137	status = acpi_get_data(handle, acpi_glue_data_handler, (void **)&dev);
	138	if (ACPI_SUCCESS(status))
	139	return get_device(dev);
	140	return NULL;
	141	}
	142
	143	EXPORT_SYMBOL(acpi_get_physical_device);
	144
	145	static int acpi_bind_one(struct device *dev, acpi_handle handle)
	146	{
1071695f	147	struct acpi_device *acpi_dev;
4e10d12a DSL	148	acpi_status status;
4e10d12a DSL	149
465ae641	150	if (dev->archdata.acpi_handle) {
fc3a8828	151	dev_warn(dev, "Drivers changed 'acpi_handle'\n");
4e10d12a DSL	152	return -EINVAL;
	153	}
	154	get_device(dev);
	155	status = acpi_attach_data(handle, acpi_glue_data_handler, dev);
	156	if (ACPI_FAILURE(status)) {
	157	put_device(dev);
	158	return -EINVAL;
	159	}
465ae641	160	dev->archdata.acpi_handle = handle;
4e10d12a	161
1071695f DB	162	status = acpi_bus_get_device(handle, &acpi_dev);
	163	if (!ACPI_FAILURE(status)) {
	164	int ret;
	165
	166	ret = sysfs_create_link(&dev->kobj, &acpi_dev->dev.kobj,
	167	"firmware_node");
	168	ret = sysfs_create_link(&acpi_dev->dev.kobj, &dev->kobj,
	169	"physical_node");
76acae04	170	if (acpi_dev->wakeup.flags.valid) {
eb9d0fe4	171	device_set_wakeup_capable(dev, true);
76acae04 RW	172	device_set_wakeup_enable(dev,
	173	acpi_dev->wakeup.state.enabled);
	174	}
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	}