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authorAnton Arapov <anton@redhat.com>2012-04-16 10:05:28 +0200
committerAnton Arapov <anton@redhat.com>2012-04-16 10:05:28 +0200
commitb4b6116a13633898cf868f2f103c96a90c4c20f8 (patch)
tree93d1b7e2cfcdf473d8d4ff3ad141fa864f8491f6 /drivers/acpi/acpica/evgpe.c
parentedd4be777c953e5faafc80d091d3084b4343f5d3 (diff)
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fedora kernel: d9aad82f3319f3cfd1aebc01234254ef0c37ad84v3.3.2-1
Signed-off-by: Anton Arapov <anton@redhat.com>
Diffstat (limited to 'drivers/acpi/acpica/evgpe.c')
-rw-r--r--drivers/acpi/acpica/evgpe.c768
1 files changed, 768 insertions, 0 deletions
diff --git a/drivers/acpi/acpica/evgpe.c b/drivers/acpi/acpica/evgpe.c
new file mode 100644
index 00000000000..9e88cb6fb25
--- /dev/null
+++ b/drivers/acpi/acpica/evgpe.c
@@ -0,0 +1,768 @@
+/******************************************************************************
+ *
+ * Module Name: evgpe - General Purpose Event handling and dispatch
+ *
+ *****************************************************************************/
+
+/*
+ * Copyright (C) 2000 - 2012, 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);
+
+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,
+ gpe_register_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);
+ }
+
+ 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);
+
+ /*
+ * 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);
+}
+
+
+/*******************************************************************************
+ *
+ * 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_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];
+
+ /*
+ * 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)) {
+ 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 GPE Register at GPE%02X: 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->
+ node,
+ &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_SYSTEM_XFACE acpi_ev_asynch_execute_gpe_method(void *context)
+{
+ struct acpi_gpe_event_info *gpe_event_info = context;
+ acpi_status status;
+ struct acpi_gpe_event_info *local_gpe_event_info;
+ struct acpi_evaluate_info *info;
+ struct acpi_gpe_notify_object *notify_object;
+
+ ACPI_FUNCTION_TRACE(ev_asynch_execute_gpe_method);
+
+ /* Allocate a local GPE block */
+
+ local_gpe_event_info =
+ ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_gpe_event_info));
+ if (!local_gpe_event_info) {
+ ACPI_EXCEPTION((AE_INFO, AE_NO_MEMORY, "while handling a GPE"));
+ return_VOID;
+ }
+
+ status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
+ if (ACPI_FAILURE(status)) {
+ ACPI_FREE(local_gpe_event_info);
+ 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);
+ ACPI_FREE(local_gpe_event_info);
+ return_VOID;
+ }
+
+ /*
+ * 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;
+ }
+
+ /* Do the correct dispatch - normal method or implicit notify */
+
+ switch (local_gpe_event_info->flags & ACPI_GPE_DISPATCH_MASK) {
+ 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.
+ */
+ status = acpi_ev_queue_notify_request(
+ local_gpe_event_info->dispatch.device.node,
+ ACPI_NOTIFY_DEVICE_WAKE);
+
+ notify_object = local_gpe_event_info->dispatch.device.next;
+ while (ACPI_SUCCESS(status) && notify_object) {
+ status = acpi_ev_queue_notify_request(
+ notify_object->node,
+ ACPI_NOTIFY_DEVICE_WAKE);
+ notify_object = notify_object->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 =
+ 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)));
+ }
+
+ break;
+
+ default:
+ return_VOID; /* 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,
+ local_gpe_event_info);
+ if (ACPI_FAILURE(status)) {
+ ACPI_FREE(local_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;
+
+ (void)acpi_ev_finish_gpe(gpe_event_info);
+
+ ACPI_FREE(gpe_event_info);
+ 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_for_run 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);
+
+ /* 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);
+ }
+
+ /*
+ * 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));
+ return_UINT32(ACPI_INTERRUPT_NOT_HANDLED);
+ }
+ }
+
+ /*
+ * 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);
+ }
+
+ /*
+ * 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 (gpe_event_info->flags & ACPI_GPE_DISPATCH_MASK) {
+ 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%2X - 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);
+}