[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/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)
			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);
			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>
5a0e3ad6	12	#include <linux/slab.h>
4e10d12a DSL	13	#include <linux/rwsem.h>
	14	#include <linux/acpi.h>
	15
a192a958 LB	16	#include "internal.h"
a192a958 LB	17
4e10d12a DSL	18	#define ACPI_GLUE_DEBUG 0
	19	#if ACPI_GLUE_DEBUG
	20	#define DBG(x...) printk(PREFIX x)
	21	#else
4ebf83c8	22	#define DBG(x...) do { } while(0)
4e10d12a DSL	23	#endif
	24	static LIST_HEAD(bus_type_list);
	25	static DECLARE_RWSEM(bus_type_sem);
	26
	27	int register_acpi_bus_type(struct acpi_bus_type *type)
	28	{
	29	if (acpi_disabled)
	30	return -ENODEV;
	31	if (type && type->bus && type->find_device) {
	32	down_write(&bus_type_sem);
	33	list_add_tail(&type->list, &bus_type_list);
	34	up_write(&bus_type_sem);
4be44fcd LB	35	printk(KERN_INFO PREFIX "bus type %s registered\n",
4be44fcd LB	36	type->bus->name);
4e10d12a DSL	37	return 0;
	38	}
	39	return -ENODEV;
	40	}
	41
4e10d12a DSL	42	int unregister_acpi_bus_type(struct acpi_bus_type *type)
	43	{
	44	if (acpi_disabled)
	45	return 0;
	46	if (type) {
	47	down_write(&bus_type_sem);
	48	list_del_init(&type->list);
	49	up_write(&bus_type_sem);
4be44fcd LB	50	printk(KERN_INFO PREFIX "ACPI bus type %s unregistered\n",
4be44fcd LB	51	type->bus->name);
4e10d12a DSL	52	return 0;
	53	}
	54	return -ENODEV;
	55	}
	56
4e10d12a DSL	57	static struct acpi_bus_type acpi_get_bus_type(struct bus_type type)
	58	{
	59	struct acpi_bus_type tmp, ret = NULL;
	60
	61	down_read(&bus_type_sem);
	62	list_for_each_entry(tmp, &bus_type_list, list) {
	63	if (tmp->bus == type) {
	64	ret = tmp;
	65	break;
	66	}
	67	}
	68	up_read(&bus_type_sem);
	69	return ret;
	70	}
	71
	72	static int acpi_find_bridge_device(struct device dev, acpi_handle handle)
	73	{
	74	struct acpi_bus_type *tmp;
	75	int ret = -ENODEV;
	76
	77	down_read(&bus_type_sem);
	78	list_for_each_entry(tmp, &bus_type_list, list) {
	79	if (tmp->find_bridge && !tmp->find_bridge(dev, handle)) {
	80	ret = 0;
	81	break;
	82	}
	83	}
	84	up_read(&bus_type_sem);
	85	return ret;
	86	}
	87
4e10d12a DSL	88	/* Get device's handler per its address under its parent */
	89	struct acpi_find_child {
	90	acpi_handle handle;
439913ff	91	u64 address;
4e10d12a DSL	92	};
	93
	94	static acpi_status
	95	do_acpi_find_child(acpi_handle handle, u32 lvl, void context, void *rv)
	96	{
	97	acpi_status status;
	98	struct acpi_device_info *info;
50dd0969	99	struct acpi_find_child *find = context;
4e10d12a	100
15b8dd53	101	status = acpi_get_object_info(handle, &info);
4e10d12a	102	if (ACPI_SUCCESS(status)) {
4e10d12a DSL	103	if (info->address == find->address)
4e10d12a DSL	104	find->handle = handle;
15b8dd53	105	kfree(info);
4e10d12a DSL	106	}
	107	return AE_OK;
	108	}
	109
439913ff	110	acpi_handle acpi_get_child(acpi_handle parent, u64 address)
4e10d12a DSL	111	{
	112	struct acpi_find_child find = { NULL, address };
	113
	114	if (!parent)
	115	return NULL;
	116	acpi_walk_namespace(ACPI_TYPE_DEVICE, parent,
2263576c	117	1, do_acpi_find_child, NULL, &find, NULL);
4e10d12a DSL	118	return find.handle;
	119	}
	120
	121	EXPORT_SYMBOL(acpi_get_child);
	122
	123	/* Link ACPI devices with physical devices */
	124	static void acpi_glue_data_handler(acpi_handle handle,
8e4319c4	125	void *context)
4e10d12a DSL	126	{
	127	/* we provide an empty handler */
	128	}
	129
	130	/* Note: a success call will increase reference count by one */
	131	struct device *acpi_get_physical_device(acpi_handle handle)
	132	{
	133	acpi_status status;
	134	struct device *dev;
	135
	136	status = acpi_get_data(handle, acpi_glue_data_handler, (void **)&dev);
	137	if (ACPI_SUCCESS(status))
	138	return get_device(dev);
	139	return NULL;
	140	}
	141
	142	EXPORT_SYMBOL(acpi_get_physical_device);
	143
	144	static int acpi_bind_one(struct device *dev, acpi_handle handle)
	145	{
1071695f	146	struct acpi_device *acpi_dev;
4e10d12a DSL	147	acpi_status status;
4e10d12a DSL	148
465ae641	149	if (dev->archdata.acpi_handle) {
fc3a8828	150	dev_warn(dev, "Drivers changed 'acpi_handle'\n");
4e10d12a DSL	151	return -EINVAL;
	152	}
	153	get_device(dev);
	154	status = acpi_attach_data(handle, acpi_glue_data_handler, dev);
	155	if (ACPI_FAILURE(status)) {
	156	put_device(dev);
	157	return -EINVAL;
	158	}
465ae641	159	dev->archdata.acpi_handle = handle;
4e10d12a	160
1071695f DB	161	status = acpi_bus_get_device(handle, &acpi_dev);
	162	if (!ACPI_FAILURE(status)) {
	163	int ret;
	164
	165	ret = sysfs_create_link(&dev->kobj, &acpi_dev->dev.kobj,
	166	"firmware_node");
	167	ret = sysfs_create_link(&acpi_dev->dev.kobj, &dev->kobj,
	168	"physical_node");
76acae04	169	if (acpi_dev->wakeup.flags.valid) {
eb9d0fe4	170	device_set_wakeup_capable(dev, true);
76acae04 RW	171	device_set_wakeup_enable(dev,
	172	acpi_dev->wakeup.state.enabled);
	173	}
1071695f DB	174	}
1071695f DB	175
4e10d12a DSL	176	return 0;
	177	}
	178
	179	static int acpi_unbind_one(struct device *dev)
	180	{
465ae641	181	if (!dev->archdata.acpi_handle)
4e10d12a	182	return 0;
465ae641	183	if (dev == acpi_get_physical_device(dev->archdata.acpi_handle)) {
1071695f DB	184	struct acpi_device *acpi_dev;
1071695f DB	185
4e10d12a DSL	186	/* acpi_get_physical_device increase refcnt by one */
4e10d12a DSL	187	put_device(dev);
1071695f DB	188
	189	if (!acpi_bus_get_device(dev->archdata.acpi_handle,
	190	&acpi_dev)) {
	191	sysfs_remove_link(&dev->kobj, "firmware_node");
	192	sysfs_remove_link(&acpi_dev->dev.kobj, "physical_node");
	193	}
	194
465ae641 BH	195	acpi_detach_data(dev->archdata.acpi_handle,
	196	acpi_glue_data_handler);
	197	dev->archdata.acpi_handle = NULL;
4e10d12a DSL	198	/* acpi_bind_one increase refcnt by one */
	199	put_device(dev);
	200	} else {
fc3a8828	201	dev_err(dev, "Oops, 'acpi_handle' corrupt\n");
4e10d12a DSL	202	}
	203	return 0;
	204	}
	205
	206	static int acpi_platform_notify(struct device *dev)
	207	{
	208	struct acpi_bus_type *type;
	209	acpi_handle handle;
	210	int ret = -EINVAL;
	211
	212	if (!dev->bus \|\| !dev->parent) {
	213	/* bridge devices genernally haven't bus or parent */
	214	ret = acpi_find_bridge_device(dev, &handle);
	215	goto end;
	216	}
	217	type = acpi_get_bus_type(dev->bus);
	218	if (!type) {
db1461ad	219	DBG("No ACPI bus support for %s\n", dev_name(dev));
4e10d12a DSL	220	ret = -EINVAL;
	221	goto end;
	222	}
	223	if ((ret = type->find_device(dev, &handle)) != 0)
db1461ad	224	DBG("Can't get handler for %s\n", dev_name(dev));
4e10d12a DSL	225	end:
	226	if (!ret)
	227	acpi_bind_one(dev, handle);
	228
	229	#if ACPI_GLUE_DEBUG
	230	if (!ret) {
	231	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
	232
465ae641 BH	233	acpi_get_name(dev->archdata.acpi_handle,
465ae641 BH	234	ACPI_FULL_PATHNAME, &buffer);
db1461ad	235	DBG("Device %s -> %s\n", dev_name(dev), (char *)buffer.pointer);
02438d87	236	kfree(buffer.pointer);
4e10d12a	237	} else
db1461ad	238	DBG("Device %s -> No ACPI support\n", dev_name(dev));
4e10d12a DSL	239	#endif
	240
	241	return ret;
	242	}
	243
	244	static int acpi_platform_notify_remove(struct device *dev)
	245	{
	246	acpi_unbind_one(dev);
	247	return 0;
	248	}
	249
0e46517d	250	int __init init_acpi_device_notify(void)
4e10d12a	251	{
4e10d12a DSL	252	if (platform_notify \|\| platform_notify_remove) {
	253	printk(KERN_ERR PREFIX "Can't use platform_notify\n");
	254	return 0;
	255	}
	256	platform_notify = acpi_platform_notify;
	257	platform_notify_remove = acpi_platform_notify_remove;
	258	return 0;
	259	}