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

 *

 * Module Name: evgpe - General Purpose Event handling and dispatch

 *

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

/*

 * 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.

 */

#include 

#include "accommon.h"

#include "acevents.h"

#include "acnamesp.h"

#define _COMPONENT          ACPI_EVENTS

ACPI_MODULE_NAME("evgpe")

#if (!ACPI_REDUCED_HARDWARE)	/* Entire module */

/* Local prototypes */

static void ACPI_SYSTEM_XFACE acpi_ev_asynch_execute_gpe_method(void *context);

static void ACPI_SYSTEM_XFACE acpi_ev_asynch_enable_gpe(void *context);

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

 *

 * FUNCTION:    acpi_ev_update_gpe_enable_mask

 *

 * PARAMETERS:  gpe_event_info          - GPE to update

 *

 * RETURN:      Status

 *

 * DESCRIPTION: Updates GPE register enable mask based upon whether there are

 *              runtime references to this GPE

 *

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

acpi_status

acpi_ev_update_gpe_enable_mask(struct acpi_gpe_event_info *gpe_event_info)

{

	struct acpi_gpe_register_info *gpe_register_info;

	u32 register_bit;

	ACPI_FUNCTION_TRACE(ev_update_gpe_enable_mask);

	gpe_register_info = gpe_event_info->register_info;

	if (!gpe_register_info) {

		return_ACPI_STATUS(AE_NOT_EXIST);

	}

	register_bit = acpi_hw_get_gpe_register_bit(gpe_event_info);

	/* Clear the run bit up front */

	ACPI_CLEAR_BIT(gpe_register_info->enable_for_run, register_bit);

	/* Set the mask bit only if there are references to this GPE */

	if (gpe_event_info->runtime_count) {

		ACPI_SET_BIT(gpe_register_info->enable_for_run,

			     (u8)register_bit);

	}

	gpe_register_info->enable_mask = gpe_register_info->enable_for_run;

	return_ACPI_STATUS(AE_OK);

}

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

 *

 * FUNCTION:    acpi_ev_enable_gpe

 *

 * PARAMETERS:  gpe_event_info          - GPE to enable

 *

 * RETURN:      Status

 *

 * DESCRIPTION: Clear a GPE of stale events and enable it.

 *

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

acpi_status acpi_ev_enable_gpe(struct acpi_gpe_event_info *gpe_event_info)

{

	acpi_status status;

	ACPI_FUNCTION_TRACE(ev_enable_gpe);

	/* Clear the GPE (of stale events) */

	status = acpi_hw_clear_gpe(gpe_event_info);

	if (ACPI_FAILURE(status)) {

		return_ACPI_STATUS(status);

	}

	/* Enable the requested GPE */

	status = acpi_hw_low_set_gpe(gpe_event_info, ACPI_GPE_ENABLE);

	return_ACPI_STATUS(status);

}

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

 *

 * FUNCTION:    acpi_ev_add_gpe_reference

 *

 * PARAMETERS:  gpe_event_info          - Add a reference to this GPE

 *

 * RETURN:      Status

 *

 * DESCRIPTION: Add a reference to a GPE. On the first reference, the GPE is

 *              hardware-enabled.

 *

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

acpi_status

acpi_ev_add_gpe_reference(struct acpi_gpe_event_info *gpe_event_info)

{

	acpi_status status = AE_OK;

	ACPI_FUNCTION_TRACE(ev_add_gpe_reference);

	if (gpe_event_info->runtime_count == ACPI_UINT8_MAX) {

		return_ACPI_STATUS(AE_LIMIT);

	}

	gpe_event_info->runtime_count++;

	if (gpe_event_info->runtime_count == 1) {

		/* Enable on first reference */

		status = acpi_ev_update_gpe_enable_mask(gpe_event_info);

		if (ACPI_SUCCESS(status)) {

			status = acpi_ev_enable_gpe(gpe_event_info);

		}

		if (ACPI_FAILURE(status)) {

			gpe_event_info->runtime_count--;

		}

	}

	return_ACPI_STATUS(status);

}

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

 *

 * FUNCTION:    acpi_ev_remove_gpe_reference

 *

 * PARAMETERS:  gpe_event_info          - Remove a reference to this GPE

 *

 * RETURN:      Status

 *

 * DESCRIPTION: Remove a reference to a GPE. When the last reference is

 *              removed, the GPE is hardware-disabled.

 *

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

acpi_status

acpi_ev_remove_gpe_reference(struct acpi_gpe_event_info *gpe_event_info)

{

	acpi_status status = AE_OK;

	ACPI_FUNCTION_TRACE(ev_remove_gpe_reference);

	if (!gpe_event_info->runtime_count) {

		return_ACPI_STATUS(AE_LIMIT);

	}

	gpe_event_info->runtime_count--;

	if (!gpe_event_info->runtime_count) {

		/* Disable on last reference */

		status = acpi_ev_update_gpe_enable_mask(gpe_event_info);

		if (ACPI_SUCCESS(status)) {

			status =

			    acpi_hw_low_set_gpe(gpe_event_info,

						ACPI_GPE_DISABLE);

		}

		if (ACPI_FAILURE(status)) {

			gpe_event_info->runtime_count++;

		}

	}

	return_ACPI_STATUS(status);

}

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

 *

 * FUNCTION:    acpi_ev_low_get_gpe_info

 *

 * PARAMETERS:  gpe_number          - Raw GPE number

 *              gpe_block           - A GPE info block

 *

 * RETURN:      A GPE event_info struct. NULL if not a valid GPE (The gpe_number

 *              is not within the specified GPE block)

 *

 * DESCRIPTION: Returns the event_info struct associated with this GPE. This is

 *              the low-level implementation of ev_get_gpe_event_info.

 *

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

struct acpi_gpe_event_info *acpi_ev_low_get_gpe_info(u32 gpe_number,

						     struct acpi_gpe_block_info

						     *gpe_block)

{

	u32 gpe_index;

	/*

	 * Validate that the gpe_number is within the specified gpe_block.

	 * (Two steps)

	 */

	if (!gpe_block || (gpe_number < gpe_block->block_base_number)) {

		return (NULL);

	}

	gpe_index = gpe_number - gpe_block->block_base_number;

	if (gpe_index >= gpe_block->gpe_count) {

		return (NULL);

	}

	return (&gpe_block->event_info[gpe_index]);

}

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

 *

 * FUNCTION:    acpi_ev_get_gpe_event_info

 *

 * PARAMETERS:  gpe_device          - Device node. NULL for GPE0/GPE1

 *              gpe_number          - Raw GPE number

 *

 * RETURN:      A GPE event_info struct. NULL if not a valid GPE

 *

 * DESCRIPTION: Returns the event_info struct associated with this GPE.

 *              Validates the gpe_block and the gpe_number

 *

 *              Should be called only when the GPE lists are semaphore locked

 *              and not subject to change.

 *

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

struct acpi_gpe_event_info *acpi_ev_get_gpe_event_info(acpi_handle gpe_device,

						       u32 gpe_number)

{

	union acpi_operand_object *obj_desc;

	struct acpi_gpe_event_info *gpe_info;

	u32 i;

	ACPI_FUNCTION_ENTRY();

	/* A NULL gpe_device means use the FADT-defined GPE block(s) */

	if (!gpe_device) {

		/* Examine GPE Block 0 and 1 (These blocks are permanent) */

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

			gpe_info = acpi_ev_low_get_gpe_info(gpe_number,

							    acpi_gbl_gpe_fadt_blocks

							    [i]);

			if (gpe_info) {

				return (gpe_info);

			}

		}

		/* The gpe_number was not in the range of either FADT GPE block */

		return (NULL);

	}

	/* A Non-NULL gpe_device means this is a GPE Block Device */

	obj_desc =

	    acpi_ns_get_attached_object((struct acpi_namespace_node *)

					       gpe_device);

	if (!obj_desc || !obj_desc->device.gpe_block) {

		return (NULL);

	}

	return (acpi_ev_low_get_gpe_info

		(gpe_number, obj_desc->device.gpe_block));

}

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

 *

 * FUNCTION:    acpi_ev_gpe_detect

 *

 * PARAMETERS:  gpe_xrupt_list      - Interrupt block for this interrupt.

 *                                    Can have multiple GPE blocks attached.

 *

 * RETURN:      INTERRUPT_HANDLED or INTERRUPT_NOT_HANDLED

 *

 * DESCRIPTION: Detect if any GP events have occurred. This function is

 *              executed at interrupt level.

 *

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

u32 acpi_ev_gpe_detect(struct acpi_gpe_xrupt_info *gpe_xrupt_list)

{

	acpi_status status;

	struct acpi_gpe_block_info *gpe_block;

	struct acpi_namespace_node *gpe_device;

	struct acpi_gpe_register_info *gpe_register_info;

	struct acpi_gpe_event_info *gpe_event_info;

	u32 gpe_number;

	struct acpi_gpe_handler_info *gpe_handler_info;

	u32 int_status = ACPI_INTERRUPT_NOT_HANDLED;

	u8 enabled_status_byte;

	u32 status_reg;

	u32 enable_reg;

	acpi_cpu_flags flags;

	u32 i;

	u32 j;

	ACPI_FUNCTION_NAME(ev_gpe_detect);

	/* Check for the case where there are no GPEs */

	if (!gpe_xrupt_list) {

		return (int_status);

	}

	/*

	 * We need to obtain the GPE lock for both the data structs and registers

	 * Note: Not necessary to obtain the hardware lock, since the GPE

	 * registers are owned by the gpe_lock.

	 */

	flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);

	/* Examine all GPE blocks attached to this interrupt level */

	gpe_block = gpe_xrupt_list->gpe_block_list_head;

	while (gpe_block) {

		gpe_device = gpe_block->node;

		/*

		 * Read all of the 8-bit GPE status and enable registers in this GPE

		 * block, saving all of them. Find all currently active GP events.

		 */

		for (i = 0; i < gpe_block->register_count; i++) {

			/* Get the next status/enable pair */

			gpe_register_info = &gpe_block->register_info[i];

			/*

			 * Optimization: If there are no GPEs enabled within this

			 * register, we can safely ignore the entire register.

			 */

			if (!(gpe_register_info->enable_for_run |

			      gpe_register_info->enable_for_wake)) {

				ACPI_DEBUG_PRINT((ACPI_DB_INTERRUPTS,

						  "Ignore disabled registers for GPE %02X-%02X: "

						  "RunEnable=%02X, WakeEnable=%02X\n",

						  gpe_register_info->

						  base_gpe_number,

						  gpe_register_info->

						  base_gpe_number +

						  (ACPI_GPE_REGISTER_WIDTH - 1),

						  gpe_register_info->

						  enable_for_run,

						  gpe_register_info->

						  enable_for_wake));

				continue;

			}

			/* Read the Status Register */

			status =

			    acpi_hw_read(&status_reg,

					 &gpe_register_info->status_address);

			if (ACPI_FAILURE(status)) {

				goto unlock_and_exit;

			}

			/* Read the Enable Register */

			status =

			    acpi_hw_read(&enable_reg,

					 &gpe_register_info->enable_address);

			if (ACPI_FAILURE(status)) {

				goto unlock_and_exit;

			}

			ACPI_DEBUG_PRINT((ACPI_DB_INTERRUPTS,

					  "Read registers for GPE %02X-%02X: Status=%02X, Enable=%02X, "

					  "RunEnable=%02X, WakeEnable=%02X\n",

					  gpe_register_info->base_gpe_number,

					  gpe_register_info->base_gpe_number +

					  (ACPI_GPE_REGISTER_WIDTH - 1),

					  status_reg, enable_reg,

					  gpe_register_info->enable_for_run,

					  gpe_register_info->enable_for_wake));

			/* Check if there is anything active at all in this register */

			enabled_status_byte = (u8)(status_reg & enable_reg);

			if (!enabled_status_byte) {

				/* No active GPEs in this register, move on */

				continue;

			}

			/* Now look at the individual GPEs in this byte register */

			for (j = 0; j < ACPI_GPE_REGISTER_WIDTH; j++) {

				/* Examine one GPE bit */

				gpe_event_info =

				    &gpe_block->

				    event_info[((acpi_size) i *

						ACPI_GPE_REGISTER_WIDTH) + j];

				gpe_number =

				    j + gpe_register_info->base_gpe_number;

				if (enabled_status_byte & (1 << j)) {

					/* Invoke global event handler if present */

					acpi_gpe_count++;

					if (acpi_gbl_global_event_handler) {

						acpi_gbl_global_event_handler

						    (ACPI_EVENT_TYPE_GPE,

						     gpe_device, gpe_number,

						     acpi_gbl_global_event_handler_context);

					}

					/* Found an active GPE */

					if (ACPI_GPE_DISPATCH_TYPE

					    (gpe_event_info->flags) ==

					    ACPI_GPE_DISPATCH_RAW_HANDLER) {

						/* Dispatch the event to a raw handler */

						gpe_handler_info =

						    gpe_event_info->dispatch.

						    handler;

						/*

						 * There is no protection around the namespace node

						 * and the GPE handler to ensure a safe destruction

						 * because:

						 * 1. The namespace node is expected to always

						 *    exist after loading a table.

						 * 2. The GPE handler is expected to be flushed by

						 *    acpi_os_wait_events_complete() before the

						 *    destruction.

						 */

						acpi_os_release_lock

						    (acpi_gbl_gpe_lock, flags);

						int_status |=

						    gpe_handler_info->

						    address(gpe_device,

							    gpe_number,

							    gpe_handler_info->

							    context);

						flags =

						    acpi_os_acquire_lock

						    (acpi_gbl_gpe_lock);

					} else {

						/*

						 * Dispatch the event to a standard handler or

						 * method.

						 */

						int_status |=

						    acpi_ev_gpe_dispatch

						    (gpe_device, gpe_event_info,

						     gpe_number);

					}

				}

			}

		}

		gpe_block = gpe_block->next;

	}

unlock_and_exit:

	acpi_os_release_lock(acpi_gbl_gpe_lock, flags);

	return (int_status);

}

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

 *

 * FUNCTION:    acpi_ev_asynch_execute_gpe_method

 *

 * PARAMETERS:  Context (gpe_event_info) - Info for this GPE

 *

 * RETURN:      None

 *

 * DESCRIPTION: Perform the actual execution of a GPE control method. This

 *              function is called from an invocation of acpi_os_execute and

 *              therefore does NOT execute at interrupt level - so that

 *              the control method itself is not executed in the context of

 *              an interrupt handler.

 *

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

static void ACPI_SYSTEM_XFACE acpi_ev_asynch_execute_gpe_method(void *context)

{

	struct acpi_gpe_event_info *gpe_event_info = context;

	acpi_status status = AE_OK;

	struct acpi_evaluate_info *info;

	struct acpi_gpe_notify_info *notify;

	ACPI_FUNCTION_TRACE(ev_asynch_execute_gpe_method);

	/* Do the correct dispatch - normal method or implicit notify */

	switch (ACPI_GPE_DISPATCH_TYPE(gpe_event_info->flags)) {

	case ACPI_GPE_DISPATCH_NOTIFY:

		/*

		 * Implicit notify.

		 * Dispatch a DEVICE_WAKE notify to the appropriate handler.

		 * NOTE: the request is queued for execution after this method

		 * completes. The notify handlers are NOT invoked synchronously

		 * from this thread -- because handlers may in turn run other

		 * control methods.

		 *

		 * June 2012: Expand implicit notify mechanism to support

		 * notifies on multiple device objects.

		 */

		notify = gpe_event_info->dispatch.notify_list;

		while (ACPI_SUCCESS(status) && notify) {

			status =

			    acpi_ev_queue_notify_request(notify->device_node,

							 ACPI_NOTIFY_DEVICE_WAKE);

			notify = notify->next;

		}

		break;

	case ACPI_GPE_DISPATCH_METHOD:

		/* Allocate the evaluation information block */

		info = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_evaluate_info));

		if (!info) {

			status = AE_NO_MEMORY;

		} else {

			/*

			 * Invoke the GPE Method (_Lxx, _Exx) i.e., evaluate the

			 * _Lxx/_Exx control method that corresponds to this GPE

			 */

			info->prefix_node =

			    gpe_event_info->dispatch.method_node;

			info->flags = ACPI_IGNORE_RETURN_VALUE;

			status = acpi_ns_evaluate(info);

			ACPI_FREE(info);

		}

		if (ACPI_FAILURE(status)) {

			ACPI_EXCEPTION((AE_INFO, status,

					"while evaluating GPE method [%4.4s]",

					acpi_ut_get_node_name(gpe_event_info->

							      dispatch.

							      method_node)));

		}

		break;

	default:

		goto error_exit;	/* Should never happen */

	}

	/* Defer enabling of GPE until all notify handlers are done */

	status = acpi_os_execute(OSL_NOTIFY_HANDLER,

				 acpi_ev_asynch_enable_gpe, gpe_event_info);

	if (ACPI_SUCCESS(status)) {

		return_VOID;

	}

error_exit:

	acpi_ev_asynch_enable_gpe(gpe_event_info);

	return_VOID;

}

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

 *

 * FUNCTION:    acpi_ev_asynch_enable_gpe

 *

 * PARAMETERS:  Context (gpe_event_info) - Info for this GPE

 *              Callback from acpi_os_execute

 *

 * RETURN:      None

 *

 * DESCRIPTION: Asynchronous clear/enable for GPE. This allows the GPE to

 *              complete (i.e., finish execution of Notify)

 *

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

static void ACPI_SYSTEM_XFACE acpi_ev_asynch_enable_gpe(void *context)

{

	struct acpi_gpe_event_info *gpe_event_info = context;

	acpi_cpu_flags flags;

	flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);

	(void)acpi_ev_finish_gpe(gpe_event_info);

	acpi_os_release_lock(acpi_gbl_gpe_lock, flags);

	return;

}

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

 *

 * FUNCTION:    acpi_ev_finish_gpe

 *

 * PARAMETERS:  gpe_event_info      - Info for this GPE

 *

 * RETURN:      Status

 *

 * DESCRIPTION: Clear/Enable a GPE. Common code that is used after execution

 *              of a GPE method or a synchronous or asynchronous GPE handler.

 *

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

acpi_status acpi_ev_finish_gpe(struct acpi_gpe_event_info * gpe_event_info)

{

	acpi_status status;

	if ((gpe_event_info->flags & ACPI_GPE_XRUPT_TYPE_MASK) ==

	    ACPI_GPE_LEVEL_TRIGGERED) {

		/*

		 * GPE is level-triggered, we clear the GPE status bit after

		 * handling the event.

		 */

		status = acpi_hw_clear_gpe(gpe_event_info);

		if (ACPI_FAILURE(status)) {

			return (status);

		}

	}

	/*

	 * Enable this GPE, conditionally. This means that the GPE will

	 * only be physically enabled if the enable_mask bit is set

	 * in the event_info.

	 */

	(void)acpi_hw_low_set_gpe(gpe_event_info, ACPI_GPE_CONDITIONAL_ENABLE);

	return (AE_OK);

}

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

 *

 * FUNCTION:    acpi_ev_gpe_dispatch

 *

 * PARAMETERS:  gpe_device          - Device node. NULL for GPE0/GPE1

 *              gpe_event_info      - Info for this GPE

 *              gpe_number          - Number relative to the parent GPE block

 *

 * RETURN:      INTERRUPT_HANDLED or INTERRUPT_NOT_HANDLED

 *

 * DESCRIPTION: Dispatch a General Purpose Event to either a function (e.g. EC)

 *              or method (e.g. _Lxx/_Exx) handler.

 *

 *              This function executes at interrupt level.

 *

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

u32

acpi_ev_gpe_dispatch(struct acpi_namespace_node *gpe_device,

		     struct acpi_gpe_event_info *gpe_event_info, u32 gpe_number)

{

	acpi_status status;

	u32 return_value;

	ACPI_FUNCTION_TRACE(ev_gpe_dispatch);

	/*

	 * Always disable the GPE so that it does not keep firing before

	 * any asynchronous activity completes (either from the execution

	 * of a GPE method or an asynchronous GPE handler.)

	 *

	 * If there is no handler or method to run, just disable the

	 * GPE and leave it disabled permanently to prevent further such

	 * pointless events from firing.

	 */

	status = acpi_hw_low_set_gpe(gpe_event_info, ACPI_GPE_DISABLE);

	if (ACPI_FAILURE(status)) {

		ACPI_EXCEPTION((AE_INFO, status,

				"Unable to disable GPE %02X", gpe_number));

		return_UINT32(ACPI_INTERRUPT_NOT_HANDLED);

	}

	/*

	 * If edge-triggered, clear the GPE status bit now. Note that

	 * level-triggered events are cleared after the GPE is serviced.

	 */

	if ((gpe_event_info->flags & ACPI_GPE_XRUPT_TYPE_MASK) ==

	    ACPI_GPE_EDGE_TRIGGERED) {

		status = acpi_hw_clear_gpe(gpe_event_info);

		if (ACPI_FAILURE(status)) {

			ACPI_EXCEPTION((AE_INFO, status,

					"Unable to clear GPE %02X",

					gpe_number));

			(void)acpi_hw_low_set_gpe(gpe_event_info,

						  ACPI_GPE_CONDITIONAL_ENABLE);

			return_UINT32(ACPI_INTERRUPT_NOT_HANDLED);

		}

	}

	/*

	 * Dispatch the GPE to either an installed handler or the control

	 * method associated with this GPE (_Lxx or _Exx). If a handler

	 * exists, we invoke it and do not attempt to run the method.

	 * If there is neither a handler nor a method, leave the GPE

	 * disabled.

	 */

	switch (ACPI_GPE_DISPATCH_TYPE(gpe_event_info->flags)) {

	case ACPI_GPE_DISPATCH_HANDLER:

		/* Invoke the installed handler (at interrupt level) */

		return_value =

		    gpe_event_info->dispatch.handler->address(gpe_device,

							      gpe_number,

							      gpe_event_info->

							      dispatch.handler->

							      context);

		/* If requested, clear (if level-triggered) and reenable the GPE */

		if (return_value & ACPI_REENABLE_GPE) {

			(void)acpi_ev_finish_gpe(gpe_event_info);

		}

		break;

	case ACPI_GPE_DISPATCH_METHOD:

	case ACPI_GPE_DISPATCH_NOTIFY:

		/*

		 * Execute the method associated with the GPE

		 * NOTE: Level-triggered GPEs are cleared after the method completes.

		 */

		status = acpi_os_execute(OSL_GPE_HANDLER,

					 acpi_ev_asynch_execute_gpe_method,

					 gpe_event_info);

		if (ACPI_FAILURE(status)) {

			ACPI_EXCEPTION((AE_INFO, status,

					"Unable to queue handler for GPE %02X - event disabled",

					gpe_number));

		}

		break;

	default:

		/*

		 * No handler or method to run!

		 * 03/2010: This case should no longer be possible. We will not allow

		 * a GPE to be enabled if it has no handler or method.

		 */

		ACPI_ERROR((AE_INFO,

			    "No handler or method for GPE %02X, disabling event",

			    gpe_number));

		break;

	}

	return_UINT32(ACPI_INTERRUPT_HANDLED);

}

#endif				/* !ACPI_REDUCED_HARDWARE */