Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6

1 files changed, 722 insertions, 0 deletions

diff --git a/drivers/acpi/acpica/evgpe.c b/drivers/acpi/acpica/evgpe.c
new file mode 100644
index 00000000000..f345ced3647
--- /dev/null
+++ b/drivers/acpi/acpica/evgpe.c
@@ -0,0 +1,722 @@
+/******************************************************************************
+ *
+ * Module Name: evgpe - General Purpose Event handling and dispatch
+ *
+ *****************************************************************************/
+
+/*
+ * Copyright (C) 2000 - 2008, 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 <acpi/acpi.h>
+#include "accommon.h"
+#include "acevents.h"
+#include "acnamesp.h"
+
+#define _COMPONENT          ACPI_EVENTS
+ACPI_MODULE_NAME("evgpe")
+
+/* Local prototypes */
+static void ACPI_SYSTEM_XFACE acpi_ev_asynch_execute_gpe_method(void *context);
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ev_set_gpe_type
+ *
+ * PARAMETERS:  gpe_event_info          - GPE to set
+ *              Type                    - New type
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: Sets the new type for the GPE (wake, run, or wake/run)
+ *
+ ******************************************************************************/
+
+acpi_status
+acpi_ev_set_gpe_type(struct acpi_gpe_event_info *gpe_event_info, u8 type)
+{
+	acpi_status status;
+
+	ACPI_FUNCTION_TRACE(ev_set_gpe_type);
+
+	/* Validate type and update register enable masks */
+
+	switch (type) {
+	case ACPI_GPE_TYPE_WAKE:
+	case ACPI_GPE_TYPE_RUNTIME:
+	case ACPI_GPE_TYPE_WAKE_RUN:
+		break;
+
+	default:
+		return_ACPI_STATUS(AE_BAD_PARAMETER);
+	}
+
+	/* Disable the GPE if currently enabled */
+
+	status = acpi_ev_disable_gpe(gpe_event_info);
+
+	/* Type was validated above */
+
+	gpe_event_info->flags &= ~ACPI_GPE_TYPE_MASK;	/* Clear type bits */
+	gpe_event_info->flags |= type;	/* Insert type */
+	return_ACPI_STATUS(status);
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ev_update_gpe_enable_masks
+ *
+ * PARAMETERS:  gpe_event_info          - GPE to update
+ *              Type                    - What to do: ACPI_GPE_DISABLE or
+ *                                        ACPI_GPE_ENABLE
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: Updates GPE register enable masks based on the GPE type
+ *
+ ******************************************************************************/
+
+acpi_status
+acpi_ev_update_gpe_enable_masks(struct acpi_gpe_event_info *gpe_event_info,
+				u8 type)
+{
+	struct acpi_gpe_register_info *gpe_register_info;
+	u8 register_bit;
+
+	ACPI_FUNCTION_TRACE(ev_update_gpe_enable_masks);
+
+	gpe_register_info = gpe_event_info->register_info;
+	if (!gpe_register_info) {
+		return_ACPI_STATUS(AE_NOT_EXIST);
+	}
+	register_bit = (u8)
+	    (1 <<
+	     (gpe_event_info->gpe_number - gpe_register_info->base_gpe_number));
+
+	/* 1) Disable case. Simply clear all enable bits */
+
+	if (type == ACPI_GPE_DISABLE) {
+		ACPI_CLEAR_BIT(gpe_register_info->enable_for_wake,
+			       register_bit);
+		ACPI_CLEAR_BIT(gpe_register_info->enable_for_run, register_bit);
+		return_ACPI_STATUS(AE_OK);
+	}
+
+	/* 2) Enable case. Set/Clear the appropriate enable bits */
+
+	switch (gpe_event_info->flags & ACPI_GPE_TYPE_MASK) {
+	case ACPI_GPE_TYPE_WAKE:
+		ACPI_SET_BIT(gpe_register_info->enable_for_wake, register_bit);
+		ACPI_CLEAR_BIT(gpe_register_info->enable_for_run, register_bit);
+		break;
+
+	case ACPI_GPE_TYPE_RUNTIME:
+		ACPI_CLEAR_BIT(gpe_register_info->enable_for_wake,
+			       register_bit);
+		ACPI_SET_BIT(gpe_register_info->enable_for_run, register_bit);
+		break;
+
+	case ACPI_GPE_TYPE_WAKE_RUN:
+		ACPI_SET_BIT(gpe_register_info->enable_for_wake, register_bit);
+		ACPI_SET_BIT(gpe_register_info->enable_for_run, register_bit);
+		break;
+
+	default:
+		return_ACPI_STATUS(AE_BAD_PARAMETER);
+	}
+
+	return_ACPI_STATUS(AE_OK);
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ev_enable_gpe
+ *
+ * PARAMETERS:  gpe_event_info          - GPE to enable
+ *              write_to_hardware       - Enable now, or just mark data structs
+ *                                        (WAKE GPEs should be deferred)
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: Enable a GPE based on the GPE type
+ *
+ ******************************************************************************/
+
+acpi_status
+acpi_ev_enable_gpe(struct acpi_gpe_event_info *gpe_event_info,
+		   u8 write_to_hardware)
+{
+	acpi_status status;
+
+	ACPI_FUNCTION_TRACE(ev_enable_gpe);
+
+	/* Make sure HW enable masks are updated */
+
+	status =
+	    acpi_ev_update_gpe_enable_masks(gpe_event_info, ACPI_GPE_ENABLE);
+	if (ACPI_FAILURE(status)) {
+		return_ACPI_STATUS(status);
+	}
+
+	/* Mark wake-enabled or HW enable, or both */
+
+	switch (gpe_event_info->flags & ACPI_GPE_TYPE_MASK) {
+	case ACPI_GPE_TYPE_WAKE:
+
+		ACPI_SET_BIT(gpe_event_info->flags, ACPI_GPE_WAKE_ENABLED);
+		break;
+
+	case ACPI_GPE_TYPE_WAKE_RUN:
+
+		ACPI_SET_BIT(gpe_event_info->flags, ACPI_GPE_WAKE_ENABLED);
+
+		/*lint -fallthrough */
+
+	case ACPI_GPE_TYPE_RUNTIME:
+
+		ACPI_SET_BIT(gpe_event_info->flags, ACPI_GPE_RUN_ENABLED);
+
+		if (write_to_hardware) {
+
+			/* Clear the GPE (of stale events), then enable it */
+
+			status = acpi_hw_clear_gpe(gpe_event_info);
+			if (ACPI_FAILURE(status)) {
+				return_ACPI_STATUS(status);
+			}
+
+			/* Enable the requested runtime GPE */
+
+			status = acpi_hw_write_gpe_enable_reg(gpe_event_info);
+		}
+		break;
+
+	default:
+		return_ACPI_STATUS(AE_BAD_PARAMETER);
+	}
+
+	return_ACPI_STATUS(AE_OK);
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ev_disable_gpe
+ *
+ * PARAMETERS:  gpe_event_info          - GPE to disable
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: Disable a GPE based on the GPE type
+ *
+ ******************************************************************************/
+
+acpi_status acpi_ev_disable_gpe(struct acpi_gpe_event_info *gpe_event_info)
+{
+	acpi_status status;
+
+	ACPI_FUNCTION_TRACE(ev_disable_gpe);
+
+	/* Make sure HW enable masks are updated */
+
+	status =
+	    acpi_ev_update_gpe_enable_masks(gpe_event_info, ACPI_GPE_DISABLE);
+	if (ACPI_FAILURE(status)) {
+		return_ACPI_STATUS(status);
+	}
+
+	/* Clear the appropriate enabled flags for this GPE */
+
+	switch (gpe_event_info->flags & ACPI_GPE_TYPE_MASK) {
+	case ACPI_GPE_TYPE_WAKE:
+		ACPI_CLEAR_BIT(gpe_event_info->flags, ACPI_GPE_WAKE_ENABLED);
+		break;
+
+	case ACPI_GPE_TYPE_WAKE_RUN:
+		ACPI_CLEAR_BIT(gpe_event_info->flags, ACPI_GPE_WAKE_ENABLED);
+
+		/* fallthrough */
+
+	case ACPI_GPE_TYPE_RUNTIME:
+
+		/* Disable the requested runtime GPE */
+
+		ACPI_CLEAR_BIT(gpe_event_info->flags, ACPI_GPE_RUN_ENABLED);
+		break;
+
+	default:
+		break;
+	}
+
+	/*
+	 * Even if we don't know the GPE type, make sure that we always
+	 * disable it. low_disable_gpe will just clear the enable bit for this
+	 * GPE and write it. It will not write out the current GPE enable mask,
+	 * since this may inadvertently enable GPEs too early, if a rogue GPE has
+	 * come in during ACPICA initialization - possibly as a result of AML or
+	 * other code that has enabled the GPE.
+	 */
+	status = acpi_hw_low_disable_gpe(gpe_event_info);
+	return_ACPI_STATUS(status);
+}
+
+/*******************************************************************************
+ *
+ * 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_block_info *gpe_block;
+	u32 i;
+
+	ACPI_FUNCTION_ENTRY();
+
+	/* A NULL gpe_block 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_block = acpi_gbl_gpe_fadt_blocks[i];
+			if (gpe_block) {
+				if ((gpe_number >= gpe_block->block_base_number)
+				    && (gpe_number <
+					gpe_block->block_base_number +
+					(gpe_block->register_count * 8))) {
+					return (&gpe_block->
+						event_info[gpe_number -
+							   gpe_block->
+							   block_base_number]);
+				}
+			}
+		}
+
+		/* 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);
+	}
+
+	gpe_block = obj_desc->device.gpe_block;
+
+	if ((gpe_number >= gpe_block->block_base_number) &&
+	    (gpe_number <
+	     gpe_block->block_base_number + (gpe_block->register_count * 8))) {
+		return (&gpe_block->
+			event_info[gpe_number - gpe_block->block_base_number]);
+	}
+
+	return (NULL);
+}
+
+/*******************************************************************************
+ *
+ * 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_gpe_register_info *gpe_register_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) {
+		/*
+		 * 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];
+
+			/* Read the Status Register */
+
+			status =
+			    acpi_read(&status_reg,
+				      &gpe_register_info->status_address);
+			if (ACPI_FAILURE(status)) {
+				goto unlock_and_exit;
+			}
+
+			/* Read the Enable Register */
+
+			status =
+			    acpi_read(&enable_reg,
+				      &gpe_register_info->enable_address);
+			if (ACPI_FAILURE(status)) {
+				goto unlock_and_exit;
+			}
+
+			ACPI_DEBUG_PRINT((ACPI_DB_INTERRUPTS,
+					  "Read GPE Register at GPE%X: Status=%02X, Enable=%02X\n",
+					  gpe_register_info->base_gpe_number,
+					  status_reg, enable_reg));
+
+			/* 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 */
+
+				if (enabled_status_byte & (1 << j)) {
+					/*
+					 * Found an active GPE. Dispatch the event to a handler
+					 * or method.
+					 */
+					int_status |=
+					    acpi_ev_gpe_dispatch(&gpe_block->
+						event_info[((acpi_size) i * ACPI_GPE_REGISTER_WIDTH) + j], j + gpe_register_info->base_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_ev_asynch_enable_gpe(void *context);
+
+static void ACPI_SYSTEM_XFACE acpi_ev_asynch_execute_gpe_method(void *context)
+{
+	struct acpi_gpe_event_info *gpe_event_info = (void *)context;
+	acpi_status status;
+	struct acpi_gpe_event_info local_gpe_event_info;
+	struct acpi_evaluate_info *info;
+
+	ACPI_FUNCTION_TRACE(ev_asynch_execute_gpe_method);
+
+	status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
+	if (ACPI_FAILURE(status)) {
+		return_VOID;
+	}
+
+	/* Must revalidate the gpe_number/gpe_block */
+
+	if (!acpi_ev_valid_gpe_event(gpe_event_info)) {
+		status = acpi_ut_release_mutex(ACPI_MTX_EVENTS);
+		return_VOID;
+	}
+
+	/* Set the GPE flags for return to enabled state */
+
+	(void)acpi_ev_enable_gpe(gpe_event_info, FALSE);
+
+	/*
+	 * Take a snapshot of the GPE info for this level - we copy the info to
+	 * prevent a race condition with remove_handler/remove_block.
+	 */
+	ACPI_MEMCPY(&local_gpe_event_info, gpe_event_info,
+		    sizeof(struct acpi_gpe_event_info));
+
+	status = acpi_ut_release_mutex(ACPI_MTX_EVENTS);
+	if (ACPI_FAILURE(status)) {
+		return_VOID;
+	}
+
+	/*
+	 * Must check for control method type dispatch one more time to avoid a
+	 * race with ev_gpe_install_handler
+	 */
+	if ((local_gpe_event_info.flags & ACPI_GPE_DISPATCH_MASK) ==
+	    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 =
+			    local_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
+					(local_gpe_event_info.dispatch.
+					 method_node)));
+		}
+	}
+	/* Defer enabling of GPE until all notify handlers are done */
+	acpi_os_execute(OSL_NOTIFY_HANDLER, acpi_ev_asynch_enable_gpe,
+				gpe_event_info);
+	return_VOID;
+}
+
+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 */
+	(void)acpi_hw_write_gpe_enable_reg(gpe_event_info);
+	return_VOID;
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ev_gpe_dispatch
+ *
+ * PARAMETERS:  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_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_ev_disable_gpe(gpe_event_info);
+		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_ev_disable_gpe(gpe_event_info);
+		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);
+}