[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/init.h>
#include <linux/list.h>
#include <linux/device.h>
#include <linux/rwsem.h>
#include <linux/acpi.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);

/* ToDo: When a PCI bridge is found, return the PCI device behind the bridge
 *       This should work in general, but did not on a Lenovo T61 for the
 *	 graphics card. But this must be fixed when the PCI device is
 *       bound and the kernel device struct is attached to the acpi device
 * Note: A success call will increase reference count by one
 *       Do call put_device(dev) on the returned device then
 */
struct device *acpi_get_physical_pci_device(acpi_handle handle)
{
	struct device *dev;
	long long device_id;
	acpi_status status;

	status =
		acpi_evaluate_integer(handle, "_ADR", NULL, &device_id);

	if (ACPI_FAILURE(status))
		return NULL;

	/* We need to attempt to determine whether the _ADR refers to a
	   PCI device or not. There's no terribly good way to do this,
	   so the best we can hope for is to assume that there'll never
	   be a device in the host bridge */
	if (device_id >= 0x10000) {
		/* It looks like a PCI device. Does it exist? */
		dev = acpi_get_physical_device(handle);
	} else {
		/* It doesn't look like a PCI device. Does its parent
		   exist? */
		acpi_handle phandle;
		if (acpi_get_parent(handle, &phandle))
			return NULL;
		dev = acpi_get_physical_device(phandle);
	}
	if (!dev)
		return NULL;
	return dev;
}
EXPORT_SYMBOL(acpi_get_physical_pci_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->bus_id);
		ret = -EINVAL;
		goto end;
	}
	if ((ret = type->find_device(dev, &handle)) != 0)
		DBG("Can't get handler for %s\n", dev->bus_id);
      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->bus_id, (char *)buffer.pointer);
		kfree(buffer.pointer);
	} else
		DBG("Device %s -> No ACPI support\n", dev->bus_id);
#endif

	return ret;
}

static int acpi_platform_notify_remove(struct device *dev)
{
	acpi_unbind_one(dev);
	return 0;
}

static int __init init_acpi_device_notify(void)
{
	if (acpi_disabled)
		return 0;
	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;
}

arch_initcall(init_acpi_device_notify);
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
	15	#define ACPI_GLUE_DEBUG 0
	16	#if ACPI_GLUE_DEBUG
	17	#define DBG(x...) printk(PREFIX x)
	18	#else
4ebf83c8	19	#define DBG(x...) do { } while(0)
4e10d12a DSL	20	#endif
	21	static LIST_HEAD(bus_type_list);
	22	static DECLARE_RWSEM(bus_type_sem);
	23
	24	int register_acpi_bus_type(struct acpi_bus_type *type)
	25	{
	26	if (acpi_disabled)
	27	return -ENODEV;
	28	if (type && type->bus && type->find_device) {
	29	down_write(&bus_type_sem);
	30	list_add_tail(&type->list, &bus_type_list);
	31	up_write(&bus_type_sem);
4be44fcd LB	32	printk(KERN_INFO PREFIX "bus type %s registered\n",
4be44fcd LB	33	type->bus->name);
4e10d12a DSL	34	return 0;
	35	}
	36	return -ENODEV;
	37	}
	38
4e10d12a DSL	39	int unregister_acpi_bus_type(struct acpi_bus_type *type)
	40	{
	41	if (acpi_disabled)
	42	return 0;
	43	if (type) {
	44	down_write(&bus_type_sem);
	45	list_del_init(&type->list);
	46	up_write(&bus_type_sem);
4be44fcd LB	47	printk(KERN_INFO PREFIX "ACPI bus type %s unregistered\n",
4be44fcd LB	48	type->bus->name);
4e10d12a DSL	49	return 0;
	50	}
	51	return -ENODEV;
	52	}
	53
4e10d12a DSL	54	static struct acpi_bus_type acpi_get_bus_type(struct bus_type type)
	55	{
	56	struct acpi_bus_type tmp, ret = NULL;
	57
	58	down_read(&bus_type_sem);
	59	list_for_each_entry(tmp, &bus_type_list, list) {
	60	if (tmp->bus == type) {
	61	ret = tmp;
	62	break;
	63	}
	64	}
	65	up_read(&bus_type_sem);
	66	return ret;
	67	}
	68
	69	static int acpi_find_bridge_device(struct device dev, acpi_handle handle)
	70	{
	71	struct acpi_bus_type *tmp;
	72	int ret = -ENODEV;
	73
	74	down_read(&bus_type_sem);
	75	list_for_each_entry(tmp, &bus_type_list, list) {
	76	if (tmp->find_bridge && !tmp->find_bridge(dev, handle)) {
	77	ret = 0;
	78	break;
	79	}
	80	}
	81	up_read(&bus_type_sem);
	82	return ret;
	83	}
	84
4e10d12a DSL	85	/* Get device's handler per its address under its parent */
	86	struct acpi_find_child {
	87	acpi_handle handle;
	88	acpi_integer address;
	89	};
	90
	91	static acpi_status
	92	do_acpi_find_child(acpi_handle handle, u32 lvl, void context, void *rv)
	93	{
	94	acpi_status status;
	95	struct acpi_device_info *info;
	96	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
50dd0969	97	struct acpi_find_child *find = context;
4e10d12a DSL	98
	99	status = acpi_get_object_info(handle, &buffer);
	100	if (ACPI_SUCCESS(status)) {
	101	info = buffer.pointer;
	102	if (info->address == find->address)
	103	find->handle = handle;
02438d87	104	kfree(buffer.pointer);
4e10d12a DSL	105	}
	106	return AE_OK;
	107	}
	108
	109	acpi_handle acpi_get_child(acpi_handle parent, acpi_integer address)
	110	{
	111	struct acpi_find_child find = { NULL, address };
	112
	113	if (!parent)
	114	return NULL;
	115	acpi_walk_namespace(ACPI_TYPE_DEVICE, parent,
	116	1, do_acpi_find_child, &find, NULL);
	117	return find.handle;
	118	}
	119
	120	EXPORT_SYMBOL(acpi_get_child);
	121
	122	/* Link ACPI devices with physical devices */
	123	static void acpi_glue_data_handler(acpi_handle handle,
	124	u32 function, void *context)
	125	{
	126	/* we provide an empty handler */
	127	}
	128
	129	/* Note: a success call will increase reference count by one */
	130	struct device *acpi_get_physical_device(acpi_handle handle)
	131	{
	132	acpi_status status;
	133	struct device *dev;
	134
	135	status = acpi_get_data(handle, acpi_glue_data_handler, (void **)&dev);
	136	if (ACPI_SUCCESS(status))
	137	return get_device(dev);
	138	return NULL;
	139	}
	140
	141	EXPORT_SYMBOL(acpi_get_physical_device);
	142
22c13f9d TR	143	/* ToDo: When a PCI bridge is found, return the PCI device behind the bridge
	144	* This should work in general, but did not on a Lenovo T61 for the
	145	* graphics card. But this must be fixed when the PCI device is
	146	* bound and the kernel device struct is attached to the acpi device
	147	* Note: A success call will increase reference count by one
	148	* Do call put_device(dev) on the returned device then
	149	*/
	150	struct device *acpi_get_physical_pci_device(acpi_handle handle)
	151	{
	152	struct device *dev;
	153	long long device_id;
	154	acpi_status status;
	155
	156	status =
	157	acpi_evaluate_integer(handle, "_ADR", NULL, &device_id);
	158
	159	if (ACPI_FAILURE(status))
	160	return NULL;
	161
	162	/* We need to attempt to determine whether the _ADR refers to a
	163	PCI device or not. There's no terribly good way to do this,
	164	so the best we can hope for is to assume that there'll never
	165	be a device in the host bridge */
	166	if (device_id >= 0x10000) {
	167	/* It looks like a PCI device. Does it exist? */
	168	dev = acpi_get_physical_device(handle);
	169	} else {
	170	/* It doesn't look like a PCI device. Does its parent
	171	exist? */
	172	acpi_handle phandle;
	173	if (acpi_get_parent(handle, &phandle))
	174	return NULL;
	175	dev = acpi_get_physical_device(phandle);
	176	}
	177	if (!dev)
	178	return NULL;
	179	return dev;
	180	}
	181	EXPORT_SYMBOL(acpi_get_physical_pci_device);
	182
4e10d12a DSL	183	static int acpi_bind_one(struct device *dev, acpi_handle handle)
4e10d12a DSL	184	{
1071695f	185	struct acpi_device *acpi_dev;
4e10d12a DSL	186	acpi_status status;
4e10d12a DSL	187
465ae641	188	if (dev->archdata.acpi_handle) {
fc3a8828	189	dev_warn(dev, "Drivers changed 'acpi_handle'\n");
4e10d12a DSL	190	return -EINVAL;
	191	}
	192	get_device(dev);
	193	status = acpi_attach_data(handle, acpi_glue_data_handler, dev);
	194	if (ACPI_FAILURE(status)) {
	195	put_device(dev);
	196	return -EINVAL;
	197	}
465ae641	198	dev->archdata.acpi_handle = handle;
4e10d12a	199
1071695f DB	200	status = acpi_bus_get_device(handle, &acpi_dev);
	201	if (!ACPI_FAILURE(status)) {
	202	int ret;
	203
	204	ret = sysfs_create_link(&dev->kobj, &acpi_dev->dev.kobj,
	205	"firmware_node");
	206	ret = sysfs_create_link(&acpi_dev->dev.kobj, &dev->kobj,
	207	"physical_node");
76acae04	208	if (acpi_dev->wakeup.flags.valid) {
eb9d0fe4	209	device_set_wakeup_capable(dev, true);
76acae04 RW	210	device_set_wakeup_enable(dev,
	211	acpi_dev->wakeup.state.enabled);
	212	}
1071695f DB	213	}
1071695f DB	214
4e10d12a DSL	215	return 0;
	216	}
	217
	218	static int acpi_unbind_one(struct device *dev)
	219	{
465ae641	220	if (!dev->archdata.acpi_handle)
4e10d12a	221	return 0;
465ae641	222	if (dev == acpi_get_physical_device(dev->archdata.acpi_handle)) {
1071695f DB	223	struct acpi_device *acpi_dev;
1071695f DB	224
4e10d12a DSL	225	/* acpi_get_physical_device increase refcnt by one */
4e10d12a DSL	226	put_device(dev);
1071695f DB	227
	228	if (!acpi_bus_get_device(dev->archdata.acpi_handle,
	229	&acpi_dev)) {
	230	sysfs_remove_link(&dev->kobj, "firmware_node");
	231	sysfs_remove_link(&acpi_dev->dev.kobj, "physical_node");
	232	}
	233
465ae641 BH	234	acpi_detach_data(dev->archdata.acpi_handle,
	235	acpi_glue_data_handler);
	236	dev->archdata.acpi_handle = NULL;
4e10d12a DSL	237	/* acpi_bind_one increase refcnt by one */
	238	put_device(dev);
	239	} else {
fc3a8828	240	dev_err(dev, "Oops, 'acpi_handle' corrupt\n");
4e10d12a DSL	241	}
	242	return 0;
	243	}
	244
	245	static int acpi_platform_notify(struct device *dev)
	246	{
	247	struct acpi_bus_type *type;
	248	acpi_handle handle;
	249	int ret = -EINVAL;
	250
	251	if (!dev->bus \|\| !dev->parent) {
	252	/* bridge devices genernally haven't bus or parent */
	253	ret = acpi_find_bridge_device(dev, &handle);
	254	goto end;
	255	}
	256	type = acpi_get_bus_type(dev->bus);
	257	if (!type) {
ef7b06cd	258	DBG("No ACPI bus support for %s\n", dev->bus_id);
4e10d12a DSL	259	ret = -EINVAL;
	260	goto end;
	261	}
	262	if ((ret = type->find_device(dev, &handle)) != 0)
ef7b06cd	263	DBG("Can't get handler for %s\n", dev->bus_id);
4e10d12a DSL	264	end:
	265	if (!ret)
	266	acpi_bind_one(dev, handle);
	267
	268	#if ACPI_GLUE_DEBUG
	269	if (!ret) {
	270	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
	271
465ae641 BH	272	acpi_get_name(dev->archdata.acpi_handle,
465ae641 BH	273	ACPI_FULL_PATHNAME, &buffer);
4e10d12a	274	DBG("Device %s -> %s\n", dev->bus_id, (char *)buffer.pointer);
02438d87	275	kfree(buffer.pointer);
4e10d12a DSL	276	} else
	277	DBG("Device %s -> No ACPI support\n", dev->bus_id);
	278	#endif
	279
	280	return ret;
	281	}
	282
	283	static int acpi_platform_notify_remove(struct device *dev)
	284	{
	285	acpi_unbind_one(dev);
	286	return 0;
	287	}
	288
	289	static int __init init_acpi_device_notify(void)
	290	{
	291	if (acpi_disabled)
	292	return 0;
	293	if (platform_notify \|\| platform_notify_remove) {
	294	printk(KERN_ERR PREFIX "Can't use platform_notify\n");
	295	return 0;
	296	}
	297	platform_notify = acpi_platform_notify;
	298	platform_notify_remove = acpi_platform_notify_remove;
	299	return 0;
	300	}
	301
	302	arch_initcall(init_acpi_device_notify);