Linux-2.6.12-rc2

[linux-2.6/kvm.git] / drivers / acpi / events / evgpe.c

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

/*
 * Copyright (C) 2000 - 2005, R. Byron Moore
 * 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 <acpi/acevents.h>
#include <acpi/acnamesp.h>

#define _COMPONENT          ACPI_EVENTS
         ACPI_MODULE_NAME    ("evgpe")


/*******************************************************************************
 *
 * 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 = gpe_event_info->register_bit;

        /* 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");


        if (!(gpe_event_info->flags & ACPI_GPE_ENABLE_MASK)) {
                return_ACPI_STATUS (AE_OK);
        }

        /* 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);
        }

        /* Mark wake-disabled or HW disable, or both */

        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);

                /*lint -fallthrough */

        case ACPI_GPE_TYPE_RUNTIME:

                /* Disable the requested runtime GPE */

                ACPI_CLEAR_BIT (gpe_event_info->flags, ACPI_GPE_RUN_ENABLED);
                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_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;
        acpi_native_uint                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)
{
        u32                             int_status = ACPI_INTERRUPT_NOT_HANDLED;
        u8                              enabled_status_byte;
        struct acpi_gpe_register_info   *gpe_register_info;
        u32                             status_reg;
        u32                             enable_reg;
        acpi_status                     status;
        struct acpi_gpe_block_info      *gpe_block;
        acpi_native_uint                i;
        acpi_native_uint                j;


        ACPI_FUNCTION_NAME ("ev_gpe_detect");

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

        if (!gpe_xrupt_list) {
                return (int_status);
        }

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

        acpi_os_acquire_lock (acpi_gbl_gpe_lock, ACPI_ISR);
        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_hw_low_level_read (ACPI_GPE_REGISTER_WIDTH, &status_reg,
                                         &gpe_register_info->status_address);
                        if (ACPI_FAILURE (status)) {
                                goto unlock_and_exit;
                        }

                        /* Read the Enable Register */

                        status = acpi_hw_low_level_read (ACPI_GPE_REGISTER_WIDTH, &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));

                        /* First 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 & acpi_gbl_decode_to8bit[j]) {
                                        /*
                                         * Found an active GPE. Dispatch the event to a handler
                                         * or method.
                                         */
                                        int_status |= acpi_ev_gpe_dispatch (
                                                          &gpe_block->event_info[(i * ACPI_GPE_REGISTER_WIDTH) + j],
                                                          (u32) j + gpe_register_info->base_gpe_number);
                                }
                        }
                }

                gpe_block = gpe_block->next;
        }

unlock_and_exit:

        acpi_os_release_lock (acpi_gbl_gpe_lock, ACPI_ISR);
        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_queue_for_execution
 *              (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 = (void *) context;
        u32                             gpe_number = 0;
        acpi_status                     status;
        struct acpi_gpe_event_info      local_gpe_event_info;
        struct acpi_parameter_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 race with ev_gpe_install_handler
         */
        if ((local_gpe_event_info.flags & ACPI_GPE_DISPATCH_MASK) == ACPI_GPE_DISPATCH_METHOD) {
                /*
                 * Invoke the GPE Method (_Lxx, _Exx) i.e., evaluate the _Lxx/_Exx
                 * control method that corresponds to this GPE
                 */
                info.node = local_gpe_event_info.dispatch.method_node;
                info.parameters = ACPI_CAST_PTR (union acpi_operand_object *, gpe_event_info);
                info.parameter_type = ACPI_PARAM_GPE;

                status = acpi_ns_evaluate_by_handle (&info);
                if (ACPI_FAILURE (status)) {
                        ACPI_REPORT_ERROR ((
                                "%s while evaluating method [%4.4s] for GPE[%2X]\n",
                                acpi_format_exception (status),
                                acpi_ut_get_node_name (local_gpe_event_info.dispatch.method_node),
                                gpe_number));
                }
        }

        if ((local_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 (&local_gpe_event_info);
                if (ACPI_FAILURE (status)) {
                        return_VOID;
                }
        }

        /* Enable this GPE */

        (void) acpi_hw_write_gpe_enable_reg (&local_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");


        /*
         * 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_REPORT_ERROR (("acpi_ev_gpe_dispatch: %s, Unable to clear GPE[%2X]\n",
                                acpi_format_exception (status), gpe_number));
                        return_VALUE (ACPI_INTERRUPT_NOT_HANDLED);
                }
        }

        /* Save current system state */

        if (acpi_gbl_system_awake_and_running) {
                ACPI_SET_BIT (gpe_event_info->flags, ACPI_GPE_SYSTEM_RUNNING);
        }
        else {
                ACPI_CLEAR_BIT (gpe_event_info->flags, ACPI_GPE_SYSTEM_RUNNING);
        }

        /*
         * 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 the level to
         * prevent further events from coming in here.
         */
        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_REPORT_ERROR ((
                                        "acpi_ev_gpe_dispatch: %s, Unable to clear GPE[%2X]\n",
                                        acpi_format_exception (status), gpe_number));
                                return_VALUE (ACPI_INTERRUPT_NOT_HANDLED);
                        }
                }
                break;

        case ACPI_GPE_DISPATCH_METHOD:

                /*
                 * Disable GPE, so it doesn't keep firing before the method has a
                 * chance to run.
                 */
                status = acpi_ev_disable_gpe (gpe_event_info);
                if (ACPI_FAILURE (status)) {
                        ACPI_REPORT_ERROR ((
                                "acpi_ev_gpe_dispatch: %s, Unable to disable GPE[%2X]\n",
                                acpi_format_exception (status), gpe_number));
                        return_VALUE (ACPI_INTERRUPT_NOT_HANDLED);
                }

                /*
                 * Execute the method associated with the GPE
                 * NOTE: Level-triggered GPEs are cleared after the method completes.
                 */
                status = acpi_os_queue_for_execution (OSD_PRIORITY_GPE,
                                 acpi_ev_asynch_execute_gpe_method, gpe_event_info);
                if (ACPI_FAILURE (status)) {
                        ACPI_REPORT_ERROR ((
                                "acpi_ev_gpe_dispatch: %s, Unable to queue handler for GPE[%2X] - event disabled\n",
                                acpi_format_exception (status), gpe_number));
                }
                break;

        default:

                /* No handler or method to run! */

                ACPI_REPORT_ERROR ((
                        "acpi_ev_gpe_dispatch: No handler or method for GPE[%2X], disabling event\n",
                        gpe_number));

                /*
                 * Disable the GPE.  The GPE will remain disabled until the ACPI
                 * Core Subsystem is restarted, or a handler is installed.
                 */
                status = acpi_ev_disable_gpe (gpe_event_info);
                if (ACPI_FAILURE (status)) {
                        ACPI_REPORT_ERROR ((
                                "acpi_ev_gpe_dispatch: %s, Unable to disable GPE[%2X]\n",
                                acpi_format_exception (status), gpe_number));
                        return_VALUE (ACPI_INTERRUPT_NOT_HANDLED);
                }
                break;
        }

        return_VALUE (ACPI_INTERRUPT_HANDLED);
}


#ifdef ACPI_GPE_NOTIFY_CHECK

/*******************************************************************************
 * TBD: NOT USED, PROTOTYPE ONLY AND WILL PROBABLY BE REMOVED
 *
 * FUNCTION:    acpi_ev_check_for_wake_only_gpe
 *
 * PARAMETERS:  gpe_event_info  - info for this GPE
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Determine if a a GPE is "wake-only".
 *
 *              Called from Notify() code in interpreter when a "device_wake"
 *              Notify comes in.
 *
 ******************************************************************************/

acpi_status
acpi_ev_check_for_wake_only_gpe (
        struct acpi_gpe_event_info      *gpe_event_info)
{
        acpi_status                     status;


        ACPI_FUNCTION_TRACE ("ev_check_for_wake_only_gpe");


        if ((gpe_event_info) &&  /* Only >0 for _Lxx/_Exx */
           ((gpe_event_info->flags & ACPI_GPE_SYSTEM_MASK) == ACPI_GPE_SYSTEM_RUNNING)) /* System state at GPE time */ {
                /* This must be a wake-only GPE, disable it */

                status = acpi_ev_disable_gpe (gpe_event_info);

                /* Set GPE to wake-only.  Do not change wake disabled/enabled status */

                acpi_ev_set_gpe_type (gpe_event_info, ACPI_GPE_TYPE_WAKE);

                ACPI_REPORT_INFO (("GPE %p was updated from wake/run to wake-only\n",
                                gpe_event_info));

                /* This was a wake-only GPE */

                return_ACPI_STATUS (AE_WAKE_ONLY_GPE);
        }

        return_ACPI_STATUS (AE_OK);
}
#endif