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/******************************************************************************

 *

 * Module Name: evxface - External interfaces for ACPI events

 *

 *****************************************************************************/

/*

 * Copyright (C) 2000 - 2015, Intel Corp.

 * All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 * 1. Redistributions of source code must retain the above copyright

 *    notice, this list of conditions, and the following disclaimer,

 *    without modification.

 * 2. Redistributions in binary form must reproduce at minimum a disclaimer

 *    substantially similar to the "NO WARRANTY" disclaimer below

 *    ("Disclaimer") and any redistribution must be conditioned upon

 *    including a substantially similar Disclaimer requirement for further

 *    binary redistribution.

 * 3. Neither the names of the above-listed copyright holders nor the names

 *    of any contributors may be used to endorse or promote products derived

 *    from this software without specific prior written permission.

 *

 * Alternatively, this software may be distributed under the terms of the

 * GNU General Public License ("GPL") version 2 as published by the Free

 * Software Foundation.

 *

 * NO WARRANTY

 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS

 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT

 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR

 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT

 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL

 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS

 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)

 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,

 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING

 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE

 * POSSIBILITY OF SUCH DAMAGES.

 */

#define EXPORT_ACPI_INTERFACES

#include 

#include "accommon.h"

#include "acnamesp.h"

#include "acevents.h"

#include "acinterp.h"

#define _COMPONENT          ACPI_EVENTS

ACPI_MODULE_NAME("evxface")

#if (!ACPI_REDUCED_HARDWARE)

/* Local prototypes */

static acpi_status

acpi_ev_install_gpe_handler(acpi_handle gpe_device,

			    u32 gpe_number,

			    u32 type,

			    u8 is_raw_handler,

			    acpi_gpe_handler address, void *context);

#endif

/*******************************************************************************

 *

 * FUNCTION:    acpi_install_notify_handler

 *

 * PARAMETERS:  device          - The device for which notifies will be handled

 *              handler_type    - The type of handler:

 *                                  ACPI_SYSTEM_NOTIFY: System Handler (00-7F)

 *                                  ACPI_DEVICE_NOTIFY: Device Handler (80-FF)

 *                                  ACPI_ALL_NOTIFY:    Both System and Device

 *              handler         - Address of the handler

 *              context         - Value passed to the handler on each GPE

 *

 * RETURN:      Status

 *

 * DESCRIPTION: Install a handler for notifications on an ACPI Device,

 *              thermal_zone, or Processor object.

 *

 * NOTES:       The Root namespace object may have only one handler for each

 *              type of notify (System/Device). Device/Thermal/Processor objects

 *              may have one device notify handler, and multiple system notify

 *              handlers.

 *

 ******************************************************************************/

acpi_status

acpi_install_notify_handler(acpi_handle device,

			    u32 handler_type,

			    acpi_notify_handler handler, void *context)

{

	struct acpi_namespace_node *node =

	    ACPI_CAST_PTR(struct acpi_namespace_node, device);

	union acpi_operand_object *obj_desc;

	union acpi_operand_object *handler_obj;

	acpi_status status;

	u32 i;

	ACPI_FUNCTION_TRACE(acpi_install_notify_handler);

	/* Parameter validation */

	if ((!device) || (!handler) || (!handler_type) ||

	    (handler_type > ACPI_MAX_NOTIFY_HANDLER_TYPE)) {

		return_ACPI_STATUS(AE_BAD_PARAMETER);

	}

	status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);

	if (ACPI_FAILURE(status)) {

		return_ACPI_STATUS(status);

	}

	/*

	 * Root Object:

	 * Registering a notify handler on the root object indicates that the

	 * caller wishes to receive notifications for all objects. Note that

	 * only one global handler can be registered per notify type.

	 * Ensure that a handler is not already installed.

	 */

	if (device == ACPI_ROOT_OBJECT) {

		for (i = 0; i < ACPI_NUM_NOTIFY_TYPES; i++) {

			if (handler_type & (i + 1)) {

				if (acpi_gbl_global_notify[i].handler) {

					status = AE_ALREADY_EXISTS;

					goto unlock_and_exit;

				}

				acpi_gbl_global_notify[i].handler = handler;

				acpi_gbl_global_notify[i].context = context;

			}

		}

		goto unlock_and_exit;	/* Global notify handler installed, all done */

	}

	/*

	 * All Other Objects:

	 * Caller will only receive notifications specific to the target

	 * object. Note that only certain object types are allowed to

	 * receive notifications.

	 */

	/* Are Notifies allowed on this object? */

	if (!acpi_ev_is_notify_object(node)) {

		status = AE_TYPE;

		goto unlock_and_exit;

	}

	/* Check for an existing internal object, might not exist */

	obj_desc = acpi_ns_get_attached_object(node);

	if (!obj_desc) {

		/* Create a new object */

		obj_desc = acpi_ut_create_internal_object(node->type);

		if (!obj_desc) {

			status = AE_NO_MEMORY;

			goto unlock_and_exit;

		}

		/* Attach new object to the Node, remove local reference */

		status = acpi_ns_attach_object(device, obj_desc, node->type);

		acpi_ut_remove_reference(obj_desc);

		if (ACPI_FAILURE(status)) {

			goto unlock_and_exit;

		}

	}

	/* Ensure that the handler is not already installed in the lists */

	for (i = 0; i < ACPI_NUM_NOTIFY_TYPES; i++) {

		if (handler_type & (i + 1)) {

			handler_obj = obj_desc->common_notify.notify_list[i];

			while (handler_obj) {

				if (handler_obj->notify.handler == handler) {

					status = AE_ALREADY_EXISTS;

					goto unlock_and_exit;

				}

				handler_obj = handler_obj->notify.next[i];

			}

		}

	}

	/* Create and populate a new notify handler object */

	handler_obj = acpi_ut_create_internal_object(ACPI_TYPE_LOCAL_NOTIFY);

	if (!handler_obj) {

		status = AE_NO_MEMORY;

		goto unlock_and_exit;

	}

	handler_obj->notify.node = node;

	handler_obj->notify.handler_type = handler_type;

	handler_obj->notify.handler = handler;

	handler_obj->notify.context = context;

	/* Install the handler at the list head(s) */

	for (i = 0; i < ACPI_NUM_NOTIFY_TYPES; i++) {

		if (handler_type & (i + 1)) {

			handler_obj->notify.next[i] =

			    obj_desc->common_notify.notify_list[i];

			obj_desc->common_notify.notify_list[i] = handler_obj;

		}

	}

	/* Add an extra reference if handler was installed in both lists */

	if (handler_type == ACPI_ALL_NOTIFY) {

		acpi_ut_add_reference(handler_obj);

	}

unlock_and_exit:

	(void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);

	return_ACPI_STATUS(status);

}

ACPI_EXPORT_SYMBOL(acpi_install_notify_handler)

/*******************************************************************************

 *

 * FUNCTION:    acpi_remove_notify_handler

 *

 * PARAMETERS:  device          - The device for which the handler is installed

 *              handler_type    - The type of handler:

 *                                  ACPI_SYSTEM_NOTIFY: System Handler (00-7F)

 *                                  ACPI_DEVICE_NOTIFY: Device Handler (80-FF)

 *                                  ACPI_ALL_NOTIFY:    Both System and Device

 *              handler         - Address of the handler

 *

 * RETURN:      Status

 *

 * DESCRIPTION: Remove a handler for notifies on an ACPI device

 *

 ******************************************************************************/

acpi_status

acpi_remove_notify_handler(acpi_handle device,

			   u32 handler_type, acpi_notify_handler handler)

{

	struct acpi_namespace_node *node =

	    ACPI_CAST_PTR(struct acpi_namespace_node, device);

	union acpi_operand_object *obj_desc;

	union acpi_operand_object *handler_obj;

	union acpi_operand_object *previous_handler_obj;

	acpi_status status = AE_OK;

	u32 i;

	ACPI_FUNCTION_TRACE(acpi_remove_notify_handler);

	/* Parameter validation */

	if ((!device) || (!handler) || (!handler_type) ||

	    (handler_type > ACPI_MAX_NOTIFY_HANDLER_TYPE)) {

		return_ACPI_STATUS(AE_BAD_PARAMETER);

	}

	/* Root Object. Global handlers are removed here */

	if (device == ACPI_ROOT_OBJECT) {

		for (i = 0; i < ACPI_NUM_NOTIFY_TYPES; i++) {

			if (handler_type & (i + 1)) {

				status =

				    acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);

				if (ACPI_FAILURE(status)) {

					return_ACPI_STATUS(status);

				}

				if (!acpi_gbl_global_notify[i].handler ||

				    (acpi_gbl_global_notify[i].handler !=

				     handler)) {

					status = AE_NOT_EXIST;

					goto unlock_and_exit;

				}

				ACPI_DEBUG_PRINT((ACPI_DB_INFO,

						  "Removing global notify handler\n"));

				acpi_gbl_global_notify[i].handler = NULL;

				acpi_gbl_global_notify[i].context = NULL;

				(void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);

				/* Make sure all deferred notify tasks are completed */

				acpi_os_wait_events_complete();

			}

		}

		return_ACPI_STATUS(AE_OK);

	}

	/* All other objects: Are Notifies allowed on this object? */

	if (!acpi_ev_is_notify_object(node)) {

		return_ACPI_STATUS(AE_TYPE);

	}

	/* Must have an existing internal object */

	obj_desc = acpi_ns_get_attached_object(node);

	if (!obj_desc) {

		return_ACPI_STATUS(AE_NOT_EXIST);

	}

	/* Internal object exists. Find the handler and remove it */

	for (i = 0; i < ACPI_NUM_NOTIFY_TYPES; i++) {

		if (handler_type & (i + 1)) {

			status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);

			if (ACPI_FAILURE(status)) {

				return_ACPI_STATUS(status);

			}

			handler_obj = obj_desc->common_notify.notify_list[i];

			previous_handler_obj = NULL;

			/* Attempt to find the handler in the handler list */

			while (handler_obj &&

			       (handler_obj->notify.handler != handler)) {

				previous_handler_obj = handler_obj;

				handler_obj = handler_obj->notify.next[i];

			}

			if (!handler_obj) {

				status = AE_NOT_EXIST;

				goto unlock_and_exit;

			}

			/* Remove the handler object from the list */

			if (previous_handler_obj) {	/* Handler is not at the list head */

				previous_handler_obj->notify.next[i] =

				    handler_obj->notify.next[i];

			} else {	/* Handler is at the list head */

				obj_desc->common_notify.notify_list[i] =

				    handler_obj->notify.next[i];

			}

			(void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);

			/* Make sure all deferred notify tasks are completed */

			acpi_os_wait_events_complete();

			acpi_ut_remove_reference(handler_obj);

		}

	}

	return_ACPI_STATUS(status);

unlock_and_exit:

	(void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);

	return_ACPI_STATUS(status);

}

ACPI_EXPORT_SYMBOL(acpi_remove_notify_handler)

/*******************************************************************************

 *

 * FUNCTION:    acpi_install_exception_handler

 *

 * PARAMETERS:  handler         - Pointer to the handler function for the

 *                                event

 *

 * RETURN:      Status

 *

 * DESCRIPTION: Saves the pointer to the handler function

 *

 ******************************************************************************/

#ifdef ACPI_FUTURE_USAGE

acpi_status acpi_install_exception_handler(acpi_exception_handler handler)

{

	acpi_status status;

	ACPI_FUNCTION_TRACE(acpi_install_exception_handler);

	status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);

	if (ACPI_FAILURE(status)) {

		return_ACPI_STATUS(status);

	}

	/* Don't allow two handlers. */

	if (acpi_gbl_exception_handler) {

		status = AE_ALREADY_EXISTS;

		goto cleanup;

	}

	/* Install the handler */

	acpi_gbl_exception_handler = handler;

cleanup:

	(void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);

	return_ACPI_STATUS(status);

}

ACPI_EXPORT_SYMBOL(acpi_install_exception_handler)

#endif

#if (!ACPI_REDUCED_HARDWARE)

/*******************************************************************************

 *

 * FUNCTION:    acpi_install_sci_handler

 *

 * PARAMETERS:  address             - Address of the handler

 *              context             - Value passed to the handler on each SCI

 *

 * RETURN:      Status

 *

 * DESCRIPTION: Install a handler for a System Control Interrupt.

 *

 ******************************************************************************/

acpi_status acpi_install_sci_handler(acpi_sci_handler address, void *context)

{

	struct acpi_sci_handler_info *new_sci_handler;

	struct acpi_sci_handler_info *sci_handler;

	acpi_cpu_flags flags;

	acpi_status status;

	ACPI_FUNCTION_TRACE(acpi_install_sci_handler);

	if (!address) {

		return_ACPI_STATUS(AE_BAD_PARAMETER);

	}

	/* Allocate and init a handler object */

	new_sci_handler = ACPI_ALLOCATE(sizeof(struct acpi_sci_handler_info));

	if (!new_sci_handler) {

		return_ACPI_STATUS(AE_NO_MEMORY);

	}

	new_sci_handler->address = address;

	new_sci_handler->context = context;

	status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);

	if (ACPI_FAILURE(status)) {

		goto exit;

	}

	/* Lock list during installation */

	flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);

	sci_handler = acpi_gbl_sci_handler_list;

	/* Ensure handler does not already exist */

	while (sci_handler) {

		if (address == sci_handler->address) {

			status = AE_ALREADY_EXISTS;

			goto unlock_and_exit;

		}

		sci_handler = sci_handler->next;

	}

	/* Install the new handler into the global list (at head) */

	new_sci_handler->next = acpi_gbl_sci_handler_list;

	acpi_gbl_sci_handler_list = new_sci_handler;

unlock_and_exit:

	acpi_os_release_lock(acpi_gbl_gpe_lock, flags);

	(void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);

exit:

	if (ACPI_FAILURE(status)) {

		ACPI_FREE(new_sci_handler);

	}

	return_ACPI_STATUS(status);

}

ACPI_EXPORT_SYMBOL(acpi_install_sci_handler)

/*******************************************************************************

 *

 * FUNCTION:    acpi_remove_sci_handler

 *

 * PARAMETERS:  address             - Address of the handler

 *

 * RETURN:      Status

 *

 * DESCRIPTION: Remove a handler for a System Control Interrupt.

 *

 ******************************************************************************/

acpi_status acpi_remove_sci_handler(acpi_sci_handler address)

{

	struct acpi_sci_handler_info *prev_sci_handler;

	struct acpi_sci_handler_info *next_sci_handler;

	acpi_cpu_flags flags;

	acpi_status status;

	ACPI_FUNCTION_TRACE(acpi_remove_sci_handler);

	if (!address) {

		return_ACPI_STATUS(AE_BAD_PARAMETER);

	}

	status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);

	if (ACPI_FAILURE(status)) {

		return_ACPI_STATUS(status);

	}

	/* Remove the SCI handler with lock */

	flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);

	prev_sci_handler = NULL;

	next_sci_handler = acpi_gbl_sci_handler_list;

	while (next_sci_handler) {

		if (next_sci_handler->address == address) {

			/* Unlink and free the SCI handler info block */

			if (prev_sci_handler) {

				prev_sci_handler->next = next_sci_handler->next;

			} else {

				acpi_gbl_sci_handler_list =

				    next_sci_handler->next;

			}

			acpi_os_release_lock(acpi_gbl_gpe_lock, flags);

			ACPI_FREE(next_sci_handler);

			goto unlock_and_exit;

		}

		prev_sci_handler = next_sci_handler;

		next_sci_handler = next_sci_handler->next;

	}

	acpi_os_release_lock(acpi_gbl_gpe_lock, flags);

	status = AE_NOT_EXIST;

unlock_and_exit:

	(void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);

	return_ACPI_STATUS(status);

}

ACPI_EXPORT_SYMBOL(acpi_remove_sci_handler)

/*******************************************************************************

 *

 * FUNCTION:    acpi_install_global_event_handler

 *

 * PARAMETERS:  handler         - Pointer to the global event handler function

 *              context         - Value passed to the handler on each event

 *

 * RETURN:      Status

 *

 * DESCRIPTION: Saves the pointer to the handler function. The global handler

 *              is invoked upon each incoming GPE and Fixed Event. It is

 *              invoked at interrupt level at the time of the event dispatch.

 *              Can be used to update event counters, etc.

 *

 ******************************************************************************/

acpi_status

acpi_install_global_event_handler(acpi_gbl_event_handler handler, void *context)

{

	acpi_status status;

	ACPI_FUNCTION_TRACE(acpi_install_global_event_handler);

	/* Parameter validation */

	if (!handler) {

		return_ACPI_STATUS(AE_BAD_PARAMETER);

	}

	status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);

	if (ACPI_FAILURE(status)) {

		return_ACPI_STATUS(status);

	}

	/* Don't allow two handlers. */

	if (acpi_gbl_global_event_handler) {

		status = AE_ALREADY_EXISTS;

		goto cleanup;

	}

	acpi_gbl_global_event_handler = handler;

	acpi_gbl_global_event_handler_context = context;

cleanup:

	(void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);

	return_ACPI_STATUS(status);

}

ACPI_EXPORT_SYMBOL(acpi_install_global_event_handler)

/*******************************************************************************

 *

 * FUNCTION:    acpi_install_fixed_event_handler

 *

 * PARAMETERS:  event           - Event type to enable.

 *              handler         - Pointer to the handler function for the

 *                                event

 *              context         - Value passed to the handler on each GPE

 *

 * RETURN:      Status

 *

 * DESCRIPTION: Saves the pointer to the handler function and then enables the

 *              event.

 *

 ******************************************************************************/

acpi_status

acpi_install_fixed_event_handler(u32 event,

				 acpi_event_handler handler, void *context)

{

	acpi_status status;

	ACPI_FUNCTION_TRACE(acpi_install_fixed_event_handler);

	/* Parameter validation */

	if (event > ACPI_EVENT_MAX) {

		return_ACPI_STATUS(AE_BAD_PARAMETER);

	}

	status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);

	if (ACPI_FAILURE(status)) {

		return_ACPI_STATUS(status);

	}

	/* Do not allow multiple handlers */

	if (acpi_gbl_fixed_event_handlers[event].handler) {

		status = AE_ALREADY_EXISTS;

		goto cleanup;

	}

	/* Install the handler before enabling the event */

	acpi_gbl_fixed_event_handlers[event].handler = handler;

	acpi_gbl_fixed_event_handlers[event].context = context;

	status = acpi_clear_event(event);

	if (ACPI_SUCCESS(status))

		status = acpi_enable_event(event, 0);

	if (ACPI_FAILURE(status)) {

		ACPI_WARNING((AE_INFO,

			      "Could not enable fixed event - %s (%u)",

			      acpi_ut_get_event_name(event), event));

		/* Remove the handler */

		acpi_gbl_fixed_event_handlers[event].handler = NULL;

		acpi_gbl_fixed_event_handlers[event].context = NULL;

	} else {

		ACPI_DEBUG_PRINT((ACPI_DB_INFO,

				  "Enabled fixed event %s (%X), Handler=%p\n",

				  acpi_ut_get_event_name(event), event,

				  handler));

	}

cleanup:

	(void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);

	return_ACPI_STATUS(status);

}

ACPI_EXPORT_SYMBOL(acpi_install_fixed_event_handler)

/*******************************************************************************

 *

 * FUNCTION:    acpi_remove_fixed_event_handler

 *

 * PARAMETERS:  event           - Event type to disable.

 *              handler         - Address of the handler

 *

 * RETURN:      Status

 *

 * DESCRIPTION: Disables the event and unregisters the event handler.

 *

 ******************************************************************************/

acpi_status

acpi_remove_fixed_event_handler(u32 event, acpi_event_handler handler)

{

	acpi_status status = AE_OK;

	ACPI_FUNCTION_TRACE(acpi_remove_fixed_event_handler);

	/* Parameter validation */

	if (event > ACPI_EVENT_MAX) {

		return_ACPI_STATUS(AE_BAD_PARAMETER);

	}

	status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);

	if (ACPI_FAILURE(status)) {

		return_ACPI_STATUS(status);

	}

	/* Disable the event before removing the handler */

	status = acpi_disable_event(event, 0);

	/* Always Remove the handler */

	acpi_gbl_fixed_event_handlers[event].handler = NULL;

	acpi_gbl_fixed_event_handlers[event].context = NULL;

	if (ACPI_FAILURE(status)) {

		ACPI_WARNING((AE_INFO,

			      "Could not disable fixed event - %s (%u)",

			      acpi_ut_get_event_name(event), event));

	} else {

		ACPI_DEBUG_PRINT((ACPI_DB_INFO,

				  "Disabled fixed event - %s (%X)\n",

				  acpi_ut_get_event_name(event), event));

	}

	(void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);

	return_ACPI_STATUS(status);

}

ACPI_EXPORT_SYMBOL(acpi_remove_fixed_event_handler)

/*******************************************************************************

 *

 * FUNCTION:    acpi_ev_install_gpe_handler

 *

 * PARAMETERS:  gpe_device      - Namespace node for the GPE (NULL for FADT

 *                                defined GPEs)

 *              gpe_number      - The GPE number within the GPE block

 *              type            - Whether this GPE should be treated as an

 *                                edge- or level-triggered interrupt.

 *              is_raw_handler  - Whether this GPE should be handled using

 *                                the special GPE handler mode.

 *              address         - Address of the handler

 *              context         - Value passed to the handler on each GPE

 *

 * RETURN:      Status

 *

 * DESCRIPTION: Internal function to install a handler for a General Purpose

 *              Event.

 *

 ******************************************************************************/

static acpi_status

acpi_ev_install_gpe_handler(acpi_handle gpe_device,

			    u32 gpe_number,

			    u32 type,

			    u8 is_raw_handler,

			    acpi_gpe_handler address, void *context)

{

	struct acpi_gpe_event_info *gpe_event_info;

	struct acpi_gpe_handler_info *handler;

	acpi_status status;

	acpi_cpu_flags flags;

	ACPI_FUNCTION_TRACE(ev_install_gpe_handler);

	/* Parameter validation */

	if ((!address) || (type & ~ACPI_GPE_XRUPT_TYPE_MASK)) {

		return_ACPI_STATUS(AE_BAD_PARAMETER);

	}

	status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);

	if (ACPI_FAILURE(status)) {

		return_ACPI_STATUS(status);

	}

	/* Allocate and init handler object (before lock) */

	handler = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_gpe_handler_info));

	if (!handler) {

		status = AE_NO_MEMORY;

		goto unlock_and_exit;

	}

	flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);

	/* Ensure that we have a valid GPE number */

	gpe_event_info = acpi_ev_get_gpe_event_info(gpe_device, gpe_number);

	if (!gpe_event_info) {

		status = AE_BAD_PARAMETER;

		goto free_and_exit;

	}

	/* Make sure that there isn't a handler there already */

	if ((ACPI_GPE_DISPATCH_TYPE(gpe_event_info->flags) ==

	     ACPI_GPE_DISPATCH_HANDLER) ||

	    (ACPI_GPE_DISPATCH_TYPE(gpe_event_info->flags) ==

	     ACPI_GPE_DISPATCH_RAW_HANDLER)) {

		status = AE_ALREADY_EXISTS;

		goto free_and_exit;

	}

	handler->address = address;

	handler->context = context;

	handler->method_node = gpe_event_info->dispatch.method_node;

	handler->original_flags = (u8)(gpe_event_info->flags &

				       (ACPI_GPE_XRUPT_TYPE_MASK |

					ACPI_GPE_DISPATCH_MASK));

	/*

	 * If the GPE is associated with a method, it may have been enabled

	 * automatically during initialization, in which case it has to be

	 * disabled now to avoid spurious execution of the handler.

	 */

	if (((ACPI_GPE_DISPATCH_TYPE(handler->original_flags) ==

	      ACPI_GPE_DISPATCH_METHOD) ||

	     (ACPI_GPE_DISPATCH_TYPE(handler->original_flags) ==

	      ACPI_GPE_DISPATCH_NOTIFY)) && gpe_event_info->runtime_count) {

		handler->originally_enabled = TRUE;

		(void)acpi_ev_remove_gpe_reference(gpe_event_info);

		/* Sanity check of original type against new type */

		if (type !=

		    (u32)(gpe_event_info->flags & ACPI_GPE_XRUPT_TYPE_MASK)) {

			ACPI_WARNING((AE_INFO,

				      "GPE type mismatch (level/edge)"));

		}

	}

	/* Install the handler */

	gpe_event_info->dispatch.handler = handler;

	/* Setup up dispatch flags to indicate handler (vs. method/notify) */

	gpe_event_info->flags &=

	    ~(ACPI_GPE_XRUPT_TYPE_MASK | ACPI_GPE_DISPATCH_MASK);

	gpe_event_info->flags |=

	    (u8)(type |

		 (is_raw_handler ? ACPI_GPE_DISPATCH_RAW_HANDLER :

		  ACPI_GPE_DISPATCH_HANDLER));

	acpi_os_release_lock(acpi_gbl_gpe_lock, flags);

unlock_and_exit:

	(void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);

	return_ACPI_STATUS(status);

free_and_exit:

	acpi_os_release_lock(acpi_gbl_gpe_lock, flags);

	ACPI_FREE(handler);

	goto unlock_and_exit;

}

/*******************************************************************************

 *

 * FUNCTION:    acpi_install_gpe_handler

 *

 * PARAMETERS:  gpe_device      - Namespace node for the GPE (NULL for FADT

 *                                defined GPEs)

 *              gpe_number      - The GPE number within the GPE block

 *              type            - Whether this GPE should be treated as an

 *                                edge- or level-triggered interrupt.

 *              address         - Address of the handler

 *              context         - Value passed to the handler on each GPE

 *

 * RETURN:      Status

 *

 * DESCRIPTION: Install a handler for a General Purpose Event.

 *

 ******************************************************************************/

acpi_status

acpi_install_gpe_handler(acpi_handle gpe_device,

			 u32 gpe_number,

			 u32 type, acpi_gpe_handler address, void *context)

{

	acpi_status status;

	ACPI_FUNCTION_TRACE(acpi_install_gpe_handler);

	status =

	    acpi_ev_install_gpe_handler(gpe_device, gpe_number, type, FALSE,

					address, context);

	return_ACPI_STATUS(status);

}

ACPI_EXPORT_SYMBOL(acpi_install_gpe_handler)

/*******************************************************************************

 *

 * FUNCTION:    acpi_install_gpe_raw_handler

 *

 * PARAMETERS:  gpe_device      - Namespace node for the GPE (NULL for FADT

 *                                defined GPEs)

 *              gpe_number      - The GPE number within the GPE block

 *              type            - Whether this GPE should be treated as an

 *                                edge- or level-triggered interrupt.

 *              address         - Address of the handler

 *              context         - Value passed to the handler on each GPE

 *

 * RETURN:      Status

 *

 * DESCRIPTION: Install a handler for a General Purpose Event.

 *

 ******************************************************************************/

acpi_status

acpi_install_gpe_raw_handler(acpi_handle gpe_device,

			     u32 gpe_number,

			     u32 type, acpi_gpe_handler address, void *context)

{

	acpi_status status;

	ACPI_FUNCTION_TRACE(acpi_install_gpe_raw_handler);

	status = acpi_ev_install_gpe_handler(gpe_device, gpe_number, type, TRUE,

					     address, context);

	return_ACPI_STATUS(status);

}

ACPI_EXPORT_SYMBOL(acpi_install_gpe_raw_handler)

/*******************************************************************************

 *

 * FUNCTION:    acpi_remove_gpe_handler

 *

 * PARAMETERS:  gpe_device      - Namespace node for the GPE (NULL for FADT

 *                                defined GPEs)

 *              gpe_number      - The event to remove a handler

 *              address         - Address of the handler

 *

 * RETURN:      Status

 *

 * DESCRIPTION: Remove a handler for a General Purpose acpi_event.

 *

 ******************************************************************************/

acpi_status

acpi_remove_gpe_handler(acpi_handle gpe_device,

			u32 gpe_number, acpi_gpe_handler address)

{

	struct acpi_gpe_event_info *gpe_event_info;

	struct acpi_gpe_handler_info *handler;

	acpi_status status;

	acpi_cpu_flags flags;

	ACPI_FUNCTION_TRACE(acpi_remove_gpe_handler);

	/* Parameter validation */

	if (!address) {

		return_ACPI_STATUS(AE_BAD_PARAMETER);

	}

	status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);

	if (ACPI_FAILURE(status)) {

		return_ACPI_STATUS(status);

	}

	flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);

	/* Ensure that we have a valid GPE number */

	gpe_event_info = acpi_ev_get_gpe_event_info(gpe_device, gpe_number);

	if (!gpe_event_info) {

		status = AE_BAD_PARAMETER;

		goto unlock_and_exit;

	}

	/* Make sure that a handler is indeed installed */

	if ((ACPI_GPE_DISPATCH_TYPE(gpe_event_info->flags) !=

	     ACPI_GPE_DISPATCH_HANDLER) &&

	    (ACPI_GPE_DISPATCH_TYPE(gpe_event_info->flags) !=

	     ACPI_GPE_DISPATCH_RAW_HANDLER)) {

		status = AE_NOT_EXIST;

		goto unlock_and_exit;

	}

	/* Make sure that the installed handler is the same */

	if (gpe_event_info->dispatch.handler->address != address) {

		status = AE_BAD_PARAMETER;

		goto unlock_and_exit;

	}

	/* Remove the handler */

	handler = gpe_event_info->dispatch.handler;

	gpe_event_info->dispatch.handler = NULL;

	/* Restore Method node (if any), set dispatch flags */

	gpe_event_info->dispatch.method_node = handler->method_node;

	gpe_event_info->flags &=

	    ~(ACPI_GPE_XRUPT_TYPE_MASK | ACPI_GPE_DISPATCH_MASK);

	gpe_event_info->flags |= handler->original_flags;

	/*

	 * If the GPE was previously associated with a method and it was

	 * enabled, it should be enabled at this point to restore the

	 * post-initialization configuration.

	 */

	if (((ACPI_GPE_DISPATCH_TYPE(handler->original_flags) ==

	      ACPI_GPE_DISPATCH_METHOD) ||

	     (ACPI_GPE_DISPATCH_TYPE(handler->original_flags) ==

	      ACPI_GPE_DISPATCH_NOTIFY)) && handler->originally_enabled) {

		(void)acpi_ev_add_gpe_reference(gpe_event_info);

	}

	acpi_os_release_lock(acpi_gbl_gpe_lock, flags);

	(void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);

	/* Make sure all deferred GPE tasks are completed */

	acpi_os_wait_events_complete();

	/* Now we can free the handler object */

	ACPI_FREE(handler);

	return_ACPI_STATUS(status);

unlock_and_exit:

	acpi_os_release_lock(acpi_gbl_gpe_lock, flags);

	(void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);

	return_ACPI_STATUS(status);

}

ACPI_EXPORT_SYMBOL(acpi_remove_gpe_handler)

/*******************************************************************************

 *

 * FUNCTION:    acpi_acquire_global_lock

 *

 * PARAMETERS:  timeout         - How long the caller is willing to wait

 *              handle          - Where the handle to the lock is returned

 *                                (if acquired)

 *

 * RETURN:      Status

 *

 * DESCRIPTION: Acquire the ACPI Global Lock

 *

 * Note: Allows callers with the same thread ID to acquire the global lock

 * multiple times. In other words, externally, the behavior of the global lock

 * is identical to an AML mutex. On the first acquire, a new handle is

 * returned. On any subsequent calls to acquire by the same thread, the same

 * handle is returned.

 *

 ******************************************************************************/

acpi_status acpi_acquire_global_lock(u16 timeout, u32 *handle)

{

	acpi_status status;

	if (!handle) {

		return (AE_BAD_PARAMETER);

	}

	/* Must lock interpreter to prevent race conditions */

	acpi_ex_enter_interpreter();

	status = acpi_ex_acquire_mutex_object(timeout,

					      acpi_gbl_global_lock_mutex,

					      acpi_os_get_thread_id());

	if (ACPI_SUCCESS(status)) {

		/* Return the global lock handle (updated in acpi_ev_acquire_global_lock) */

		*handle = acpi_gbl_global_lock_handle;

	}

	acpi_ex_exit_interpreter();

	return (status);

}

ACPI_EXPORT_SYMBOL(acpi_acquire_global_lock)

/*******************************************************************************

 *

 * FUNCTION:    acpi_release_global_lock

 *

 * PARAMETERS:  handle      - Returned from acpi_acquire_global_lock

 *

 * RETURN:      Status

 *

 * DESCRIPTION: Release the ACPI Global Lock. The handle must be valid.

 *

 ******************************************************************************/

acpi_status acpi_release_global_lock(u32 handle)

{

	acpi_status status;

	if (!handle || (handle != acpi_gbl_global_lock_handle)) {

		return (AE_NOT_ACQUIRED);

	}

	status = acpi_ex_release_mutex_object(acpi_gbl_global_lock_mutex);

	return (status);

}

ACPI_EXPORT_SYMBOL(acpi_release_global_lock)

#endif				/* !ACPI_REDUCED_HARDWARE */