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/*

 * scan.c - support for transforming the ACPI namespace into individual objects

 */

#include 

#include 

#include 

#include 

#include 

#include 

#include 

#include 

#include 

#include "internal.h"

#define _COMPONENT		ACPI_BUS_COMPONENT

ACPI_MODULE_NAME("scan");

#define STRUCT_TO_INT(s)	(*((int*)&s))

extern struct acpi_device *acpi_root;

#define ACPI_BUS_CLASS			"system_bus"

#define ACPI_BUS_HID			"LNXSYBUS"

#define ACPI_BUS_DEVICE_NAME		"System Bus"

#define ACPI_IS_ROOT_DEVICE(device)    (!(device)->parent)

static LIST_HEAD(acpi_device_list);

static LIST_HEAD(acpi_bus_id_list);

DEFINE_MUTEX(acpi_device_lock);

LIST_HEAD(acpi_wakeup_device_list);

struct acpi_device_bus_id{

	char bus_id[15];

	unsigned int instance_no;

	struct list_head node;

};

/*

 * Creates hid/cid(s) string needed for modalias and uevent

 * e.g. on a device with hid:IBM0001 and cid:ACPI0001 you get:

 * char *modalias: "acpi:IBM0001:ACPI0001"

*/

static int create_modalias(struct acpi_device *acpi_dev, char *modalias,

			   int size)

{

	int len;

	int count;

	struct acpi_hardware_id *id;

	len = snprintf(modalias, size, "acpi:");

	size -= len;

	list_for_each_entry(id, &acpi_dev->pnp.ids, list) {

		count = snprintf(&modalias[len], size, "%s:", id->id);

		if (count < 0 || count >= size)

			return -EINVAL;

		len += count;

		size -= count;

	}

	modalias[len] = '\0';

	return len;

}

static ssize_t

acpi_device_modalias_show(struct device *dev, struct device_attribute *attr, char *buf) {

	struct acpi_device *acpi_dev = to_acpi_device(dev);

	int len;

	/* Device has no HID and no CID or string is >1024 */

	len = create_modalias(acpi_dev, buf, 1024);

	if (len <= 0)

		return 0;

	buf[len++] = '\n';

	return len;

}

static DEVICE_ATTR(modalias, 0444, acpi_device_modalias_show, NULL);

static void acpi_bus_hot_remove_device(void *context)

{

	struct acpi_device *device;

	acpi_handle handle = context;

	struct acpi_object_list arg_list;

	union acpi_object arg;

	acpi_status status = AE_OK;

	if (acpi_bus_get_device(handle, &device))

		return;

	if (!device)

		return;

	ACPI_DEBUG_PRINT((ACPI_DB_INFO,

		"Hot-removing device %s...\n", dev_name(&device->dev)));

	if (acpi_bus_trim(device, 1)) {

		printk(KERN_ERR PREFIX

				"Removing device failed\n");

		return;

	}

	/* power off device */

	status = acpi_evaluate_object(handle, "_PS3", NULL, NULL);

	if (ACPI_FAILURE(status) && status != AE_NOT_FOUND)

		printk(KERN_WARNING PREFIX

				"Power-off device failed\n");

	if (device->flags.lockable) {

		arg_list.count = 1;

		arg_list.pointer = &arg;

		arg.type = ACPI_TYPE_INTEGER;

		arg.integer.value = 0;

		acpi_evaluate_object(handle, "_LCK", &arg_list, NULL);

	}

	arg_list.count = 1;

	arg_list.pointer = &arg;

	arg.type = ACPI_TYPE_INTEGER;

	arg.integer.value = 1;

	/*

	 * TBD: _EJD support.

	 */

	status = acpi_evaluate_object(handle, "_EJ0", &arg_list, NULL);

	if (ACPI_FAILURE(status))

		printk(KERN_WARNING PREFIX

				"Eject device failed\n");

	return;

}

static ssize_t

acpi_eject_store(struct device *d, struct device_attribute *attr,

		const char *buf, size_t count)

{

	int ret = count;

	acpi_status status;

	acpi_object_type type = 0;

	struct acpi_device *acpi_device = to_acpi_device(d);

	if ((!count) || (buf[0] != '1')) {

		return -EINVAL;

	}

#ifndef FORCE_EJECT

	if (acpi_device->driver == NULL) {

		ret = -ENODEV;

		goto err;

	}

#endif

	status = acpi_get_type(acpi_device->handle, &type);

	if (ACPI_FAILURE(status) || (!acpi_device->flags.ejectable)) {

		ret = -ENODEV;

		goto err;

	}

	acpi_os_hotplug_execute(acpi_bus_hot_remove_device, acpi_device->handle);

err:

	return ret;

}

static DEVICE_ATTR(eject, 0200, NULL, acpi_eject_store);

static ssize_t

acpi_device_hid_show(struct device *dev, struct device_attribute *attr, char *buf) {

	struct acpi_device *acpi_dev = to_acpi_device(dev);

	return sprintf(buf, "%s\n", acpi_device_hid(acpi_dev));

}

static DEVICE_ATTR(hid, 0444, acpi_device_hid_show, NULL);

static ssize_t

acpi_device_path_show(struct device *dev, struct device_attribute *attr, char *buf) {

	struct acpi_device *acpi_dev = to_acpi_device(dev);

	struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL};

	int result;

	result = acpi_get_name(acpi_dev->handle, ACPI_FULL_PATHNAME, &path);

	if (result)

		goto end;

	result = sprintf(buf, "%s\n", (char*)path.pointer);

	kfree(path.pointer);

end:

	return result;

}

static DEVICE_ATTR(path, 0444, acpi_device_path_show, NULL);

static int acpi_device_setup_files(struct acpi_device *dev)

{

	acpi_status status;

	acpi_handle temp;

	int result = 0;

	/*

	 * Devices gotten from FADT don't have a "path" attribute

	 */

	if (dev->handle) {

		result = device_create_file(&dev->dev, &dev_attr_path);

		if (result)

			goto end;

	}

	result = device_create_file(&dev->dev, &dev_attr_hid);

	if (result)

		goto end;

	result = device_create_file(&dev->dev, &dev_attr_modalias);

	if (result)

		goto end;

        /*

         * If device has _EJ0, 'eject' file is created that is used to trigger

         * hot-removal function from userland.

         */

	status = acpi_get_handle(dev->handle, "_EJ0", &temp);

	if (ACPI_SUCCESS(status))

		result = device_create_file(&dev->dev, &dev_attr_eject);

end:

	return result;

}

static void acpi_device_remove_files(struct acpi_device *dev)

{

	acpi_status status;

	acpi_handle temp;

	/*

	 * If device has _EJ0, 'eject' file is created that is used to trigger

	 * hot-removal function from userland.

	 */

	status = acpi_get_handle(dev->handle, "_EJ0", &temp);

	if (ACPI_SUCCESS(status))

		device_remove_file(&dev->dev, &dev_attr_eject);

	device_remove_file(&dev->dev, &dev_attr_modalias);

	device_remove_file(&dev->dev, &dev_attr_hid);

	if (dev->handle)

		device_remove_file(&dev->dev, &dev_attr_path);

}

/* --------------------------------------------------------------------------

			ACPI Bus operations

   -------------------------------------------------------------------------- */

int acpi_match_device_ids(struct acpi_device *device,

			  const struct acpi_device_id *ids)

{

	const struct acpi_device_id *id;

	struct acpi_hardware_id *hwid;

	/*

	 * If the device is not present, it is unnecessary to load device

	 * driver for it.

	 */

	if (!device->status.present)

		return -ENODEV;

	for (id = ids; id->id[0]; id++)

		list_for_each_entry(hwid, &device->pnp.ids, list)

			if (!strcmp((char *) id->id, hwid->id))

				return 0;

	return -ENOENT;

}

EXPORT_SYMBOL(acpi_match_device_ids);

static void acpi_free_ids(struct acpi_device *device)

{

	struct acpi_hardware_id *id, *tmp;

	list_for_each_entry_safe(id, tmp, &device->pnp.ids, list) {

		kfree(id->id);

		kfree(id);

	}

}

static void acpi_device_release(struct device *dev)

{

	struct acpi_device *acpi_dev = to_acpi_device(dev);

	acpi_free_ids(acpi_dev);

	kfree(acpi_dev);

}

static int acpi_device_suspend(struct device *dev, pm_message_t state)

{

	struct acpi_device *acpi_dev = to_acpi_device(dev);

	struct acpi_driver *acpi_drv = acpi_dev->driver;

	if (acpi_drv && acpi_drv->ops.suspend)

		return acpi_drv->ops.suspend(acpi_dev, state);

	return 0;

}

static int acpi_device_resume(struct device *dev)

{

	struct acpi_device *acpi_dev = to_acpi_device(dev);

	struct acpi_driver *acpi_drv = acpi_dev->driver;

	if (acpi_drv && acpi_drv->ops.resume)

		return acpi_drv->ops.resume(acpi_dev);

	return 0;

}

static int acpi_bus_match(struct device *dev, struct device_driver *drv)

{

	struct acpi_device *acpi_dev = to_acpi_device(dev);

	struct acpi_driver *acpi_drv = to_acpi_driver(drv);

	return !acpi_match_device_ids(acpi_dev, acpi_drv->ids);

}

static int acpi_device_uevent(struct device *dev, struct kobj_uevent_env *env)

{

	struct acpi_device *acpi_dev = to_acpi_device(dev);

	int len;

	if (add_uevent_var(env, "MODALIAS="))

		return -ENOMEM;

	len = create_modalias(acpi_dev, &env->buf[env->buflen - 1],

			      sizeof(env->buf) - env->buflen);

	if (len >= (sizeof(env->buf) - env->buflen))

		return -ENOMEM;

	env->buflen += len;

	return 0;

}

static void acpi_device_notify(acpi_handle handle, u32 event, void *data)

{

	struct acpi_device *device = data;

	device->driver->ops.notify(device, event);

}

static acpi_status acpi_device_notify_fixed(void *data)

{

	struct acpi_device *device = data;

	/* Fixed hardware devices have no handles */

	acpi_device_notify(NULL, ACPI_FIXED_HARDWARE_EVENT, device);

	return AE_OK;

}

static int acpi_device_install_notify_handler(struct acpi_device *device)

{

	acpi_status status;

	if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)

		status =

		    acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,

						     acpi_device_notify_fixed,

						     device);

	else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)

		status =

		    acpi_install_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,

						     acpi_device_notify_fixed,

						     device);

	else

		status = acpi_install_notify_handler(device->handle,

						     ACPI_DEVICE_NOTIFY,

						     acpi_device_notify,

						     device);

	if (ACPI_FAILURE(status))

		return -EINVAL;

	return 0;

}

static void acpi_device_remove_notify_handler(struct acpi_device *device)

{

	if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)

		acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,

						acpi_device_notify_fixed);

	else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)

		acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,

						acpi_device_notify_fixed);

	else

		acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,

					   acpi_device_notify);

}

static int acpi_bus_driver_init(struct acpi_device *, struct acpi_driver *);

static int acpi_start_single_object(struct acpi_device *);

static int acpi_device_probe(struct device * dev)

{

	struct acpi_device *acpi_dev = to_acpi_device(dev);

	struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver);

	int ret;

	ret = acpi_bus_driver_init(acpi_dev, acpi_drv);

	if (!ret) {

		if (acpi_dev->bus_ops.acpi_op_start)

			acpi_start_single_object(acpi_dev);

		if (acpi_drv->ops.notify) {

			ret = acpi_device_install_notify_handler(acpi_dev);

			if (ret) {

				if (acpi_drv->ops.remove)

					acpi_drv->ops.remove(acpi_dev,

						     acpi_dev->removal_type);

				return ret;

			}

		}

		ACPI_DEBUG_PRINT((ACPI_DB_INFO,

			"Found driver [%s] for device [%s]\n",

			acpi_drv->name, acpi_dev->pnp.bus_id));

		get_device(dev);

	}

	return ret;

}

static int acpi_device_remove(struct device * dev)

{

	struct acpi_device *acpi_dev = to_acpi_device(dev);

	struct acpi_driver *acpi_drv = acpi_dev->driver;

	if (acpi_drv) {

		if (acpi_drv->ops.notify)

			acpi_device_remove_notify_handler(acpi_dev);

		if (acpi_drv->ops.remove)

			acpi_drv->ops.remove(acpi_dev, acpi_dev->removal_type);

	}

	acpi_dev->driver = NULL;

	acpi_dev->driver_data = NULL;

	put_device(dev);

	return 0;

}

struct bus_type acpi_bus_type = {

	.name		= "acpi",

	.suspend	= acpi_device_suspend,

	.resume		= acpi_device_resume,

	.match		= acpi_bus_match,

	.probe		= acpi_device_probe,

	.remove		= acpi_device_remove,

	.uevent		= acpi_device_uevent,

};

static int acpi_device_register(struct acpi_device *device)

{

	int result;

	struct acpi_device_bus_id *acpi_device_bus_id, *new_bus_id;

	int found = 0;

	/*

	 * Linkage

	 * -------

	 * Link this device to its parent and siblings.

	 */

	INIT_LIST_HEAD(&device->children);

	INIT_LIST_HEAD(&device->node);

	INIT_LIST_HEAD(&device->wakeup_list);

	new_bus_id = kzalloc(sizeof(struct acpi_device_bus_id), GFP_KERNEL);

	if (!new_bus_id) {

		printk(KERN_ERR PREFIX "Memory allocation error\n");

		return -ENOMEM;

	}

	mutex_lock(&acpi_device_lock);

	/*

	 * Find suitable bus_id and instance number in acpi_bus_id_list

	 * If failed, create one and link it into acpi_bus_id_list

	 */

	list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) {

		if (!strcmp(acpi_device_bus_id->bus_id,

			    acpi_device_hid(device))) {

			acpi_device_bus_id->instance_no++;

			found = 1;

			kfree(new_bus_id);

			break;

		}

	}

	if (!found) {

		acpi_device_bus_id = new_bus_id;

		strcpy(acpi_device_bus_id->bus_id, acpi_device_hid(device));

		acpi_device_bus_id->instance_no = 0;

		list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list);

	}

	dev_set_name(&device->dev, "%s:%02x", acpi_device_bus_id->bus_id, acpi_device_bus_id->instance_no);

	if (device->parent)

		list_add_tail(&device->node, &device->parent->children);

	if (device->wakeup.flags.valid)

		list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);

	mutex_unlock(&acpi_device_lock);

	if (device->parent)

		device->dev.parent = &device->parent->dev;

	device->dev.bus = &acpi_bus_type;

	device->dev.release = &acpi_device_release;

	result = device_register(&device->dev);

	if (result) {

		dev_err(&device->dev, "Error registering device\n");

		goto end;

	}

	result = acpi_device_setup_files(device);

	if (result)

		printk(KERN_ERR PREFIX "Error creating sysfs interface for device %s\n",

		       dev_name(&device->dev));

	device->removal_type = ACPI_BUS_REMOVAL_NORMAL;

	return 0;

end:

	mutex_lock(&acpi_device_lock);

	if (device->parent)

		list_del(&device->node);

	list_del(&device->wakeup_list);

	mutex_unlock(&acpi_device_lock);

	return result;

}

static void acpi_device_unregister(struct acpi_device *device, int type)

{

	mutex_lock(&acpi_device_lock);

	if (device->parent)

		list_del(&device->node);

	list_del(&device->wakeup_list);

	mutex_unlock(&acpi_device_lock);

	acpi_detach_data(device->handle, acpi_bus_data_handler);

	acpi_device_remove_files(device);

	device_unregister(&device->dev);

}

/* --------------------------------------------------------------------------

                                 Driver Management

   -------------------------------------------------------------------------- */

/**

 * acpi_bus_driver_init - add a device to a driver

 * @device: the device to add and initialize

 * @driver: driver for the device

 *

 * Used to initialize a device via its device driver.  Called whenever a

 * driver is bound to a device.  Invokes the driver's add() ops.

 */

static int

acpi_bus_driver_init(struct acpi_device *device, struct acpi_driver *driver)

{

	int result = 0;

	if (!device || !driver)

		return -EINVAL;

	if (!driver->ops.add)

		return -ENOSYS;

	result = driver->ops.add(device);

	if (result) {

		device->driver = NULL;

		device->driver_data = NULL;

		return result;

	}

	device->driver = driver;

	/*

	 * TBD - Configuration Management: Assign resources to device based

	 * upon possible configuration and currently allocated resources.

	 */

	ACPI_DEBUG_PRINT((ACPI_DB_INFO,

			  "Driver successfully bound to device\n"));

	return 0;

}

static int acpi_start_single_object(struct acpi_device *device)

{

	int result = 0;

	struct acpi_driver *driver;

	if (!(driver = device->driver))

		return 0;

	if (driver->ops.start) {

		result = driver->ops.start(device);

		if (result && driver->ops.remove)

			driver->ops.remove(device, ACPI_BUS_REMOVAL_NORMAL);

	}

	return result;

}

/**

 * acpi_bus_register_driver - register a driver with the ACPI bus

 * @driver: driver being registered

 *

 * Registers a driver with the ACPI bus.  Searches the namespace for all

 * devices that match the driver's criteria and binds.  Returns zero for

 * success or a negative error status for failure.

 */

int acpi_bus_register_driver(struct acpi_driver *driver)

{

	int ret;

	if (acpi_disabled)

		return -ENODEV;

	driver->drv.name = driver->name;

	driver->drv.bus = &acpi_bus_type;

	driver->drv.owner = driver->owner;

	ret = driver_register(&driver->drv);

	return ret;

}

EXPORT_SYMBOL(acpi_bus_register_driver);

/**

 * acpi_bus_unregister_driver - unregisters a driver with the APIC bus

 * @driver: driver to unregister

 *

 * Unregisters a driver with the ACPI bus.  Searches the namespace for all

 * devices that match the driver's criteria and unbinds.

 */

void acpi_bus_unregister_driver(struct acpi_driver *driver)

{

	driver_unregister(&driver->drv);

}

EXPORT_SYMBOL(acpi_bus_unregister_driver);

/* --------------------------------------------------------------------------

                                 Device Enumeration

   -------------------------------------------------------------------------- */

static struct acpi_device *acpi_bus_get_parent(acpi_handle handle)

{

	acpi_status status;

	int ret;

	struct acpi_device *device;

	/*

	 * Fixed hardware devices do not appear in the namespace and do not

	 * have handles, but we fabricate acpi_devices for them, so we have

	 * to deal with them specially.

	 */

	if (handle == NULL)

		return acpi_root;

	do {

		status = acpi_get_parent(handle, &handle);

		if (status == AE_NULL_ENTRY)

			return NULL;

		if (ACPI_FAILURE(status))

			return acpi_root;

		ret = acpi_bus_get_device(handle, &device);

		if (ret == 0)

			return device;

	} while (1);

}

acpi_status

acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd)

{

	acpi_status status;

	acpi_handle tmp;

	struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};

	union acpi_object *obj;

	status = acpi_get_handle(handle, "_EJD", &tmp);

	if (ACPI_FAILURE(status))

		return status;

	status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer);

	if (ACPI_SUCCESS(status)) {

		obj = buffer.pointer;

		status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer,

					 ejd);

		kfree(buffer.pointer);

	}

	return status;

}

EXPORT_SYMBOL_GPL(acpi_bus_get_ejd);

void acpi_bus_data_handler(acpi_handle handle, void *context)

{

	/* TBD */

	return;

}

static int acpi_bus_get_perf_flags(struct acpi_device *device)

{

	device->performance.state = ACPI_STATE_UNKNOWN;

	return 0;

}

static acpi_status

acpi_bus_extract_wakeup_device_power_package(struct acpi_device *device,

					     union acpi_object *package)

{

	int i = 0;

	union acpi_object *element = NULL;

	if (!device || !package || (package->package.count < 2))

		return AE_BAD_PARAMETER;

	element = &(package->package.elements[0]);

	if (!element)

		return AE_BAD_PARAMETER;

	if (element->type == ACPI_TYPE_PACKAGE) {

		if ((element->package.count < 2) ||

		    (element->package.elements[0].type !=

		     ACPI_TYPE_LOCAL_REFERENCE)

		    || (element->package.elements[1].type != ACPI_TYPE_INTEGER))

			return AE_BAD_DATA;

		device->wakeup.gpe_device =

		    element->package.elements[0].reference.handle;

		device->wakeup.gpe_number =

		    (u32) element->package.elements[1].integer.value;

	} else if (element->type == ACPI_TYPE_INTEGER) {

		device->wakeup.gpe_number = element->integer.value;

	} else

		return AE_BAD_DATA;

	element = &(package->package.elements[1]);

	if (element->type != ACPI_TYPE_INTEGER) {

		return AE_BAD_DATA;

	}

	device->wakeup.sleep_state = element->integer.value;

	if ((package->package.count - 2) > ACPI_MAX_HANDLES) {

		return AE_NO_MEMORY;

	}

	device->wakeup.resources.count = package->package.count - 2;

	for (i = 0; i < device->wakeup.resources.count; i++) {

		element = &(package->package.elements[i + 2]);

		if (element->type != ACPI_TYPE_LOCAL_REFERENCE)

			return AE_BAD_DATA;

		device->wakeup.resources.handles[i] = element->reference.handle;

	}

	acpi_gpe_can_wake(device->wakeup.gpe_device, device->wakeup.gpe_number);

	return AE_OK;

}

static void acpi_bus_set_run_wake_flags(struct acpi_device *device)

{

	struct acpi_device_id button_device_ids[] = {

		{"PNP0C0D", 0},

		{"PNP0C0C", 0},

		{"PNP0C0E", 0},

		{"", 0},

	};

	acpi_status status;

	acpi_event_status event_status;

	device->wakeup.run_wake_count = 0;

	device->wakeup.flags.notifier_present = 0;

	/* Power button, Lid switch always enable wakeup */

	if (!acpi_match_device_ids(device, button_device_ids)) {

		device->wakeup.flags.run_wake = 1;

		device->wakeup.flags.always_enabled = 1;

		return;

	}

	status = acpi_get_gpe_status(device->wakeup.gpe_device,

					device->wakeup.gpe_number,

						&event_status);

	if (status == AE_OK)

		device->wakeup.flags.run_wake =

				!!(event_status & ACPI_EVENT_FLAG_HANDLE);

}

static int acpi_bus_get_wakeup_device_flags(struct acpi_device *device)

{

	acpi_status status = 0;

	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };

	union acpi_object *package = NULL;

	int psw_error;

	/* _PRW */

	status = acpi_evaluate_object(device->handle, "_PRW", NULL, &buffer);

	if (ACPI_FAILURE(status)) {

		ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW"));

		goto end;

	}

	package = (union acpi_object *)buffer.pointer;

	status = acpi_bus_extract_wakeup_device_power_package(device, package);

	if (ACPI_FAILURE(status)) {

		ACPI_EXCEPTION((AE_INFO, status, "Extracting _PRW package"));

		goto end;

	}

	kfree(buffer.pointer);

	device->wakeup.flags.valid = 1;

	device->wakeup.prepare_count = 0;

	acpi_bus_set_run_wake_flags(device);

	/* Call _PSW/_DSW object to disable its ability to wake the sleeping

	 * system for the ACPI device with the _PRW object.

	 * The _PSW object is depreciated in ACPI 3.0 and is replaced by _DSW.

	 * So it is necessary to call _DSW object first. Only when it is not

	 * present will the _PSW object used.

	 */

	psw_error = acpi_device_sleep_wake(device, 0, 0, 0);

	if (psw_error)

		ACPI_DEBUG_PRINT((ACPI_DB_INFO,

				"error in _DSW or _PSW evaluation\n"));

end:

	if (ACPI_FAILURE(status))

		device->flags.wake_capable = 0;

	return 0;

}

static int acpi_bus_get_power_flags(struct acpi_device *device)

{

	acpi_status status = 0;

	acpi_handle handle = NULL;

	u32 i = 0;

	/*

	 * Power Management Flags

	 */

	status = acpi_get_handle(device->handle, "_PSC", &handle);

	if (ACPI_SUCCESS(status))

		device->power.flags.explicit_get = 1;

	status = acpi_get_handle(device->handle, "_IRC", &handle);

	if (ACPI_SUCCESS(status))

		device->power.flags.inrush_current = 1;

	/*

	 * Enumerate supported power management states

	 */

	for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3; i++) {

		struct acpi_device_power_state *ps = &device->power.states[i];

		char object_name[5] = { '_', 'P', 'R', '0' + i, '\0' };

		/* Evaluate "_PRx" to se if power resources are referenced */

		acpi_evaluate_reference(device->handle, object_name, NULL,

					&ps->resources);

		if (ps->resources.count) {

			device->power.flags.power_resources = 1;

			ps->flags.valid = 1;

		}

		/* Evaluate "_PSx" to see if we can do explicit sets */

		object_name[2] = 'S';

		status = acpi_get_handle(device->handle, object_name, &handle);

		if (ACPI_SUCCESS(status)) {

			ps->flags.explicit_set = 1;

			ps->flags.valid = 1;

		}

		/* State is valid if we have some power control */

		if (ps->resources.count || ps->flags.explicit_set)

			ps->flags.valid = 1;

		ps->power = -1;	/* Unknown - driver assigned */

		ps->latency = -1;	/* Unknown - driver assigned */

	}

	/* Set defaults for D0 and D3 states (always valid) */

	device->power.states[ACPI_STATE_D0].flags.valid = 1;

	device->power.states[ACPI_STATE_D0].power = 100;

	device->power.states[ACPI_STATE_D3].flags.valid = 1;

	device->power.states[ACPI_STATE_D3].power = 0;

	/* TBD: System wake support and resource requirements. */

	device->power.state = ACPI_STATE_UNKNOWN;

	acpi_bus_get_power(device->handle, &(device->power.state));

	return 0;

}

static int acpi_bus_get_flags(struct acpi_device *device)

{

	acpi_status status = AE_OK;

	acpi_handle temp = NULL;

	/* Presence of _STA indicates 'dynamic_status' */

	status = acpi_get_handle(device->handle, "_STA", &temp);

	if (ACPI_SUCCESS(status))

		device->flags.dynamic_status = 1;

	/* Presence of _RMV indicates 'removable' */

	status = acpi_get_handle(device->handle, "_RMV", &temp);

	if (ACPI_SUCCESS(status))

		device->flags.removable = 1;

	/* Presence of _EJD|_EJ0 indicates 'ejectable' */

	status = acpi_get_handle(device->handle, "_EJD", &temp);

	if (ACPI_SUCCESS(status))

		device->flags.ejectable = 1;

	else {

		status = acpi_get_handle(device->handle, "_EJ0", &temp);

		if (ACPI_SUCCESS(status))

			device->flags.ejectable = 1;

	}

	/* Presence of _LCK indicates 'lockable' */

	status = acpi_get_handle(device->handle, "_LCK", &temp);

	if (ACPI_SUCCESS(status))

		device->flags.lockable = 1;

	/* Presence of _PS0|_PR0 indicates 'power manageable' */

	status = acpi_get_handle(device->handle, "_PS0", &temp);

	if (ACPI_FAILURE(status))

		status = acpi_get_handle(device->handle, "_PR0", &temp);

	if (ACPI_SUCCESS(status))

		device->flags.power_manageable = 1;

	/* Presence of _PRW indicates wake capable */

	status = acpi_get_handle(device->handle, "_PRW", &temp);

	if (ACPI_SUCCESS(status))

		device->flags.wake_capable = 1;

	/* TBD: Performance management */

	return 0;

}

static void acpi_device_get_busid(struct acpi_device *device)

{

	char bus_id[5] = { '?', 0 };

	struct acpi_buffer buffer = { sizeof(bus_id), bus_id };

	int i = 0;

	/*

	 * Bus ID

	 * ------

	 * The device's Bus ID is simply the object name.

	 * TBD: Shouldn't this value be unique (within the ACPI namespace)?

	 */

	if (ACPI_IS_ROOT_DEVICE(device)) {

		strcpy(device->pnp.bus_id, "ACPI");

		return;

	}

	switch (device->device_type) {

	case ACPI_BUS_TYPE_POWER_BUTTON:

		strcpy(device->pnp.bus_id, "PWRF");

		break;

	case ACPI_BUS_TYPE_SLEEP_BUTTON:

		strcpy(device->pnp.bus_id, "SLPF");

		break;

	default:

		acpi_get_name(device->handle, ACPI_SINGLE_NAME, &buffer);

		/* Clean up trailing underscores (if any) */

		for (i = 3; i > 1; i--) {

			if (bus_id[i] == '_')

				bus_id[i] = '\0';

			else

				break;

		}

		strcpy(device->pnp.bus_id, bus_id);

		break;

	}

}

/*

 * acpi_bay_match - see if a device is an ejectable driver bay

 *

 * If an acpi object is ejectable and has one of the ACPI ATA methods defined,

 * then we can safely call it an ejectable drive bay

 */

static int acpi_bay_match(struct acpi_device *device){

	acpi_status status;

	acpi_handle handle;

	acpi_handle tmp;

	acpi_handle phandle;

	handle = device->handle;

	status = acpi_get_handle(handle, "_EJ0", &tmp);

	if (ACPI_FAILURE(status))

		return -ENODEV;

	if ((ACPI_SUCCESS(acpi_get_handle(handle, "_GTF", &tmp))) ||

		(ACPI_SUCCESS(acpi_get_handle(handle, "_GTM", &tmp))) ||

		(ACPI_SUCCESS(acpi_get_handle(handle, "_STM", &tmp))) ||

		(ACPI_SUCCESS(acpi_get_handle(handle, "_SDD", &tmp))))

		return 0;

	if (acpi_get_parent(handle, &phandle))

		return -ENODEV;

        if ((ACPI_SUCCESS(acpi_get_handle(phandle, "_GTF", &tmp))) ||

                (ACPI_SUCCESS(acpi_get_handle(phandle, "_GTM", &tmp))) ||

                (ACPI_SUCCESS(acpi_get_handle(phandle, "_STM", &tmp))) ||

                (ACPI_SUCCESS(acpi_get_handle(phandle, "_SDD", &tmp))))

                return 0;

	return -ENODEV;

}

/*

 * acpi_dock_match - see if a device has a _DCK method

 */

static int acpi_dock_match(struct acpi_device *device)

{

	acpi_handle tmp;

	return acpi_get_handle(device->handle, "_DCK", &tmp);

}

char *acpi_device_hid(struct acpi_device *device)

{

	struct acpi_hardware_id *hid;

	hid = list_first_entry(&device->pnp.ids, struct acpi_hardware_id, list);

	return hid->id;

}

EXPORT_SYMBOL(acpi_device_hid);

static void acpi_add_id(struct acpi_device *device, const char *dev_id)

{

	struct acpi_hardware_id *id;

	id = kmalloc(sizeof(*id), GFP_KERNEL);

	if (!id)

		return;

	id->id = kmalloc(strlen(dev_id) + 1, GFP_KERNEL);

	if (!id->id) {

		kfree(id);

		return;

	}

	strcpy(id->id, dev_id);

	list_add_tail(&id->list, &device->pnp.ids);

}

/*

 * Old IBM workstations have a DSDT bug wherein the SMBus object

 * lacks the SMBUS01 HID and the methods do not have the necessary "_"

 * prefix.  Work around this.

 */

static int acpi_ibm_smbus_match(struct acpi_device *device)

{

	acpi_handle h_dummy;

	struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL};

	int result;

	if (!dmi_name_in_vendors("IBM"))

		return -ENODEV;

	/* Look for SMBS object */

	result = acpi_get_name(device->handle, ACPI_SINGLE_NAME, &path);

	if (result)

		return result;

	if (strcmp("SMBS", path.pointer)) {

		result = -ENODEV;

		goto out;

	}

	/* Does it have the necessary (but misnamed) methods? */

	result = -ENODEV;

	if (ACPI_SUCCESS(acpi_get_handle(device->handle, "SBI", &h_dummy)) &&

	    ACPI_SUCCESS(acpi_get_handle(device->handle, "SBR", &h_dummy)) &&

	    ACPI_SUCCESS(acpi_get_handle(device->handle, "SBW", &h_dummy)))

		result = 0;

out:

	kfree(path.pointer);

	return result;

}

static void acpi_device_set_id(struct acpi_device *device)

{

	acpi_status status;

	struct acpi_device_info *info;

	struct acpica_device_id_list *cid_list;

	int i;

	switch (device->device_type) {

	case ACPI_BUS_TYPE_DEVICE:

		if (ACPI_IS_ROOT_DEVICE(device)) {

			acpi_add_id(device, ACPI_SYSTEM_HID);

			break;

		}

		status = acpi_get_object_info(device->handle, &info);

		if (ACPI_FAILURE(status)) {

			printk(KERN_ERR PREFIX "%s: Error reading device info\n", __func__);

			return;

		}

		if (info->valid & ACPI_VALID_HID)

			acpi_add_id(device, info->hardware_id.string);

		if (info->valid & ACPI_VALID_CID) {

			cid_list = &info->compatible_id_list;

			for (i = 0; i < cid_list->count; i++)

				acpi_add_id(device, cid_list->ids[i].string);

		}

		if (info->valid & ACPI_VALID_ADR) {

			device->pnp.bus_address = info->address;

			device->flags.bus_address = 1;

		}

		kfree(info);

		/*

		 * Some devices don't reliably have _HIDs & _CIDs, so add

		 * synthetic HIDs to make sure drivers can find them.

		 */

		if (acpi_is_video_device(device))

			acpi_add_id(device, ACPI_VIDEO_HID);

		else if (ACPI_SUCCESS(acpi_bay_match(device)))

			acpi_add_id(device, ACPI_BAY_HID);

		else if (ACPI_SUCCESS(acpi_dock_match(device)))

			acpi_add_id(device, ACPI_DOCK_HID);

		else if (!acpi_ibm_smbus_match(device))

			acpi_add_id(device, ACPI_SMBUS_IBM_HID);

		else if (!acpi_device_hid(device) &&

			 ACPI_IS_ROOT_DEVICE(device->parent)) {

			acpi_add_id(device, ACPI_BUS_HID); /* \_SB, LNXSYBUS */

			strcpy(device->pnp.device_name, ACPI_BUS_DEVICE_NAME);

			strcpy(device->pnp.device_class, ACPI_BUS_CLASS);

		}

		break;

	case ACPI_BUS_TYPE_POWER: