Exemplo n.º 1
0
/*******************************************************************************
 *
 * 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);

	/*
	 * We will only allow a GPE to be enabled if it has either an associated
	 * method (_Lxx/_Exx) or a handler, or is using the implicit notify
	 * feature. Otherwise, the GPE will be immediately disabled by
	 * acpi_ev_gpe_dispatch the first time it fires.
	 */
	if ((gpe_event_info->flags & ACPI_GPE_DISPATCH_MASK) ==
	    ACPI_GPE_DISPATCH_NONE) {
		return_ACPI_STATUS(AE_NO_HANDLER);
	}

	/* 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);
}
Exemplo n.º 2
0
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);
}
acpi_status
acpi_hw_write_gpe_enable_reg(struct acpi_gpe_event_info * gpe_event_info)
{
	acpi_status status;

	ACPI_FUNCTION_ENTRY();

	status = acpi_hw_low_set_gpe(gpe_event_info, ACPI_GPE_COND_ENABLE);
	return (status);
}
Exemplo n.º 4
0
/*******************************************************************************
 *
 * FUNCTION:    acpi_set_gpe
 *
 * PARAMETERS:  gpe_device          - Parent GPE Device. NULL for GPE0/GPE1
 *              gpe_number          - GPE level within the GPE block
 *              action              - ACPI_GPE_ENABLE or ACPI_GPE_DISABLE
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Enable or disable an individual GPE. This function bypasses
 *              the reference count mechanism used in the acpi_enable_gpe(),
 *              acpi_disable_gpe() interfaces.
 *              This API is typically used by the GPE raw handler mode driver
 *              to switch between the polling mode and the interrupt mode after
 *              the driver has enabled the GPE.
 *              The APIs should be invoked in this order:
 *               acpi_enable_gpe()            <- Ensure the reference count > 0
 *               acpi_set_gpe(ACPI_GPE_DISABLE) <- Enter polling mode
 *               acpi_set_gpe(ACPI_GPE_ENABLE) <- Leave polling mode
 *               acpi_disable_gpe()           <- Decrease the reference count
 *
 * Note: If a GPE is shared by 2 silicon components, then both the drivers
 *       should support GPE polling mode or disabling the GPE for long period
 *       for one driver may break the other. So use it with care since all
 *       firmware _Lxx/_Exx handlers currently rely on the GPE interrupt mode.
 *
 ******************************************************************************/
acpi_status acpi_set_gpe(acpi_handle gpe_device, u32 gpe_number, u8 action)
{
	struct acpi_gpe_event_info *gpe_event_info;
	acpi_status status;
	acpi_cpu_flags flags;

	ACPI_FUNCTION_TRACE(acpi_set_gpe);

	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;
	}

	/* Perform the action */

	switch (action) {
	case ACPI_GPE_ENABLE:

		status = acpi_hw_low_set_gpe(gpe_event_info, ACPI_GPE_ENABLE);
		gpe_event_info->disable_for_dispatch = FALSE;
		break;

	case ACPI_GPE_DISABLE:

		status = acpi_hw_low_set_gpe(gpe_event_info, ACPI_GPE_DISABLE);
		gpe_event_info->disable_for_dispatch = TRUE;
		break;

	default:

		status = AE_BAD_PARAMETER;
		break;
	}

unlock_and_exit:
	acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
	return_ACPI_STATUS(status);
}
Exemplo n.º 5
0
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);
}
Exemplo n.º 6
0
acpi_status acpi_raw_disable_gpe(struct acpi_gpe_event_info *gpe_event_info)
{
	acpi_status status = AE_OK;

	if (!gpe_event_info->runtime_count) {
		return_ACPI_STATUS(AE_LIMIT);
	}

	gpe_event_info->runtime_count--;
	if (!gpe_event_info->runtime_count) {
		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);
}
Exemplo n.º 7
0
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);
}
Exemplo n.º 8
0
static void acpi_ev_asynch_enable_gpe(void *context)
{
	struct acpi_gpe_event_info *gpe_event_info = context;
	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_VOID;
		}
	}

	/*
	 * Enable this GPE, conditionally. This means that the GPE will only be
	 * physically enabled if the enable_for_run bit is set in the event_info
	 */
	(void)acpi_hw_low_set_gpe(gpe_event_info, ACPI_GPE_COND_ENABLE);

	return_VOID;
}
Exemplo n.º 9
0
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);
}
Exemplo n.º 10
0
acpi_status
acpi_ev_match_gpe_method(acpi_handle obj_handle,
			 u32 level, void *context, void **return_value)
{
	struct acpi_namespace_node *method_node =
	    ACPI_CAST_PTR(struct acpi_namespace_node, obj_handle);
	struct acpi_gpe_walk_info *walk_info =
	    ACPI_CAST_PTR(struct acpi_gpe_walk_info, context);
	struct acpi_gpe_event_info *gpe_event_info;
	u32 gpe_number;
	char name[ACPI_NAME_SIZE + 1];
	u8 type;

	ACPI_FUNCTION_TRACE(ev_match_gpe_method);

	/* Check if requested owner_id matches this owner_id */

	if ((walk_info->execute_by_owner_id) &&
	    (method_node->owner_id != walk_info->owner_id)) {
		return_ACPI_STATUS(AE_OK);
	}

	/*
	 * Match and decode the _Lxx and _Exx GPE method names
	 *
	 * 1) Extract the method name and null terminate it
	 */
	ACPI_MOVE_32_TO_32(name, &method_node->name.integer);
	name[ACPI_NAME_SIZE] = 0;

	/* 2) Name must begin with an underscore */

	if (name[0] != '_') {
		return_ACPI_STATUS(AE_OK);	/* Ignore this method */
	}

	/*
	 * 3) Edge/Level determination is based on the 2nd character
	 *    of the method name
	 */
	switch (name[1]) {
	case 'L':

		type = ACPI_GPE_LEVEL_TRIGGERED;
		break;

	case 'E':

		type = ACPI_GPE_EDGE_TRIGGERED;
		break;

	default:

		/* Unknown method type, just ignore it */

		ACPI_DEBUG_PRINT((ACPI_DB_LOAD,
				  "Ignoring unknown GPE method type: %s "
				  "(name not of form _Lxx or _Exx)", name));
		return_ACPI_STATUS(AE_OK);
	}

	/* 4) The last two characters of the name are the hex GPE Number */

	gpe_number = strtoul(&name[2], NULL, 16);
	if (gpe_number == ACPI_UINT32_MAX) {

		/* Conversion failed; invalid method, just ignore it */

		ACPI_DEBUG_PRINT((ACPI_DB_LOAD,
				  "Could not extract GPE number from name: %s "
				  "(name is not of form _Lxx or _Exx)", name));
		return_ACPI_STATUS(AE_OK);
	}

	/* Ensure that we have a valid GPE number for this GPE block */

	gpe_event_info =
	    acpi_ev_low_get_gpe_info(gpe_number, walk_info->gpe_block);
	if (!gpe_event_info) {
		/*
		 * This gpe_number is not valid for this GPE block, just ignore it.
		 * However, it may be valid for a different GPE block, since GPE0
		 * and GPE1 methods both appear under \_GPE.
		 */
		return_ACPI_STATUS(AE_OK);
	}

	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)) {

		/* If there is already a handler, ignore this GPE method */

		return_ACPI_STATUS(AE_OK);
	}

	if (ACPI_GPE_DISPATCH_TYPE(gpe_event_info->flags) ==
	    ACPI_GPE_DISPATCH_METHOD) {
		/*
		 * If there is already a method, ignore this method. But check
		 * for a type mismatch (if both the _Lxx AND _Exx exist)
		 */
		if (type != (gpe_event_info->flags & ACPI_GPE_XRUPT_TYPE_MASK)) {
			ACPI_ERROR((AE_INFO,
				    "For GPE 0x%.2X, found both _L%2.2X and _E%2.2X methods",
				    gpe_number, gpe_number, gpe_number));
		}
		return_ACPI_STATUS(AE_OK);
	}

	/* Disable the GPE in case it's been enabled already. */

	(void)acpi_hw_low_set_gpe(gpe_event_info, ACPI_GPE_DISABLE);

	/*
	 * Add the GPE information from above to the gpe_event_info block for
	 * use during dispatch of this GPE.
	 */
	gpe_event_info->flags &= ~(ACPI_GPE_DISPATCH_MASK);
	gpe_event_info->flags |= (u8)(type | ACPI_GPE_DISPATCH_METHOD);
	gpe_event_info->dispatch.method_node = method_node;

	ACPI_DEBUG_PRINT((ACPI_DB_LOAD,
			  "Registered GPE method %s as GPE number 0x%.2X\n",
			  name, gpe_number));
	return_ACPI_STATUS(AE_OK);
}
Exemplo n.º 11
0
acpi_status
acpi_ev_match_gpe_method(acpi_handle obj_handle,
			 u32 level, void *context, void **return_value)
{
	struct acpi_namespace_node *method_node =
	    ACPI_CAST_PTR(struct acpi_namespace_node, obj_handle);
	struct acpi_gpe_walk_info *walk_info =
	    ACPI_CAST_PTR(struct acpi_gpe_walk_info, context);
	struct acpi_gpe_event_info *gpe_event_info;
	u32 gpe_number;
	char name[ACPI_NAME_SIZE + 1];
	u8 type;

	ACPI_FUNCTION_TRACE(ev_match_gpe_method);

	

	if ((walk_info->execute_by_owner_id) &&
	    (method_node->owner_id != walk_info->owner_id)) {
		return_ACPI_STATUS(AE_OK);
	}

	ACPI_MOVE_32_TO_32(name, &method_node->name.integer);
	name[ACPI_NAME_SIZE] = 0;

	

	if (name[0] != '_') {
		return_ACPI_STATUS(AE_OK);	
	}

	switch (name[1]) {
	case 'L':
		type = ACPI_GPE_LEVEL_TRIGGERED;
		break;

	case 'E':
		type = ACPI_GPE_EDGE_TRIGGERED;
		break;

	default:
		

		ACPI_DEBUG_PRINT((ACPI_DB_LOAD,
				  "Ignoring unknown GPE method type: %s "
				  "(name not of form _Lxx or _Exx)", name));
		return_ACPI_STATUS(AE_OK);
	}

	

	gpe_number = ACPI_STRTOUL(&name[2], NULL, 16);
	if (gpe_number == ACPI_UINT32_MAX) {

		

		ACPI_DEBUG_PRINT((ACPI_DB_LOAD,
				  "Could not extract GPE number from name: %s "
				  "(name is not of form _Lxx or _Exx)", name));
		return_ACPI_STATUS(AE_OK);
	}

	

	gpe_event_info =
	    acpi_ev_low_get_gpe_info(gpe_number, walk_info->gpe_block);
	if (!gpe_event_info) {
		return_ACPI_STATUS(AE_OK);
	}

	if ((gpe_event_info->flags & ACPI_GPE_DISPATCH_MASK) ==
	    ACPI_GPE_DISPATCH_HANDLER) {

		

		return_ACPI_STATUS(AE_OK);
	}

	if ((gpe_event_info->flags & ACPI_GPE_DISPATCH_MASK) ==
	    ACPI_GPE_DISPATCH_METHOD) {
		if (type != (gpe_event_info->flags & ACPI_GPE_XRUPT_TYPE_MASK)) {
			ACPI_ERROR((AE_INFO,
				    "For GPE 0x%.2X, found both _L%2.2X and _E%2.2X methods",
				    gpe_number, gpe_number, gpe_number));
		}
		return_ACPI_STATUS(AE_OK);
	}

	
	(void)acpi_hw_low_set_gpe(gpe_event_info, ACPI_GPE_DISABLE);

	gpe_event_info->flags &= ~(ACPI_GPE_DISPATCH_MASK);
	gpe_event_info->flags |= (u8)(type | ACPI_GPE_DISPATCH_METHOD);
	gpe_event_info->dispatch.method_node = method_node;

	ACPI_DEBUG_PRINT((ACPI_DB_LOAD,
			  "Registered GPE method %s as GPE number 0x%.2X\n",
			  name, gpe_number));
	return_ACPI_STATUS(AE_OK);
}
Exemplo n.º 12
0
u32
acpi_ev_gpe_dispatch(struct acpi_gpe_event_info *gpe_event_info, u32 gpe_number)
{
	acpi_status status;

	ACPI_FUNCTION_TRACE(ev_gpe_dispatch);

	acpi_os_gpe_count(gpe_number);

	/*
	 * 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[0x%2X]",
					gpe_number));
			return_UINT32(ACPI_INTERRUPT_NOT_HANDLED);
		}
	}

	/*
	 * Dispatch the GPE to either any installed handler or control
	 * method associated with this GPE (_Lxx or _Exx). We invoke
	 * the method first in case it has side effects that would be
	 * interfered with if the handler has already altered hardware
	 * state. If there is neither a handler nor a method, we
	 * disable this GPE to prevent further such pointless events
	 * from firing.
	 */
	if (gpe_event_info->flags & ACPI_GPE_DISPATCH_METHOD) {
		/*
		 * Disable the GPE, so it doesn't keep firing before the method has a
		 * chance to run (it runs asynchronously with interrupts enabled).
		 */
		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[0x%2X]",
					gpe_number));
			return_UINT32(ACPI_INTERRUPT_NOT_HANDLED);
		}

		/*
		 * 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[0x%2X] - event disabled",
					gpe_number));
		}
	}

	if (gpe_event_info->flags & ACPI_GPE_DISPATCH_HANDLER) {
		/*
		 * Invoke the installed handler (at interrupt level)
		 * Ignore return status for now.
		 * TBD: leave GPE disabled on error?
		 */
		(void)gpe_event_info->dispatch.handler->address(gpe_event_info->
								dispatch.
								handler->
								context);

		/* It is now safe to clear level-triggered events. */

		if ((gpe_event_info->flags & ACPI_GPE_XRUPT_TYPE_MASK) ==
		    ACPI_GPE_LEVEL_TRIGGERED) {
			status = acpi_hw_clear_gpe(gpe_event_info);
			if (ACPI_FAILURE(status)) {
				ACPI_EXCEPTION((AE_INFO, status,
					"Unable to clear GPE[0x%2X]",
						gpe_number));
				return_UINT32(ACPI_INTERRUPT_NOT_HANDLED);
			}
		}
	}

	if (!(gpe_event_info->flags & ACPI_GPE_DISPATCH_MASK)) {
		/*
		 * 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[0x%2X], disabling event",
			    gpe_number));

		/*
		 * Disable the GPE. The GPE will remain disabled a handler
		 * is installed or ACPICA is restarted.
		 */
		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[0x%2X]",
					gpe_number));
			return_UINT32(ACPI_INTERRUPT_NOT_HANDLED);
		}
	}

	return_UINT32(ACPI_INTERRUPT_HANDLED);
}
u32
acpi_ev_gpe_dispatch(struct acpi_gpe_event_info *gpe_event_info, u32 gpe_number)
{
	acpi_status status;

	ACPI_FUNCTION_TRACE(ev_gpe_dispatch);

	acpi_os_gpe_count(gpe_number);

	/*
	 * 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[%2X]",
					gpe_number));
			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, we disable this GPE to prevent further such pointless
	 * events from firing.
	 */
	switch (gpe_event_info->flags & ACPI_GPE_DISPATCH_MASK) {
	case ACPI_GPE_DISPATCH_HANDLER:

		/*
		 * Invoke the installed handler (at interrupt level)
		 * Ignore return status for now.
		 * TBD: leave GPE disabled on error?
		 */
		(void)gpe_event_info->dispatch.handler->address(gpe_event_info->
								dispatch.
								handler->
								context);

		/* It is now safe to clear level-triggered events. */

		if ((gpe_event_info->flags & ACPI_GPE_XRUPT_TYPE_MASK) ==
		    ACPI_GPE_LEVEL_TRIGGERED) {
			status = acpi_hw_clear_gpe(gpe_event_info);
			if (ACPI_FAILURE(status)) {
				ACPI_EXCEPTION((AE_INFO, status,
						"Unable to clear GPE[%2X]",
						gpe_number));
				return_UINT32(ACPI_INTERRUPT_NOT_HANDLED);
			}
		}
		break;

	case ACPI_GPE_DISPATCH_METHOD:

		/*
		 * Disable the GPE, so it doesn't keep firing before the method has a
		 * chance to run (it runs asynchronously with interrupts enabled).
		 */
		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[%2X]",
					gpe_number));
			return_UINT32(ACPI_INTERRUPT_NOT_HANDLED);
		}

		/*
		 * 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[%2X] - event disabled",
					gpe_number));
		}
		break;

	default:

		/* No handler or method to run! */

		ACPI_ERROR((AE_INFO,
			    "No handler or method for GPE[%2X], disabling event",
			    gpe_number));

		/*
		 * Disable the GPE. The GPE will remain disabled until the ACPICA
		 * Core Subsystem is restarted, or a handler is installed.
		 */
		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[%2X]",
					gpe_number));
			return_UINT32(ACPI_INTERRUPT_NOT_HANDLED);
		}
		break;
	}

	return_UINT32(ACPI_INTERRUPT_HANDLED);
}