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

 *

 * Module Name: evxfevnt - External Interfaces, ACPI event disable/enable

 *

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

/*

 * Copyright (C) 2000 - 2004, 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    ("evxfevnt")

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

 *

 * FUNCTION:    acpi_enable

 *

 * PARAMETERS:  None

 *

 * RETURN:      Status

 *

 * DESCRIPTION: Transfers the system into ACPI mode.

 *

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

acpi_status

acpi_enable (void)

{

        acpi_status                     status = AE_OK;

        ACPI_FUNCTION_TRACE ("acpi_enable");

        /* Make sure we have the FADT*/

        if (!acpi_gbl_FADT) {

                ACPI_DEBUG_PRINT ((ACPI_DB_WARN, "No FADT information present!\n"));

                return_ACPI_STATUS (AE_NO_ACPI_TABLES);

        }

        if (acpi_hw_get_mode() == ACPI_SYS_MODE_ACPI) {

                ACPI_DEBUG_PRINT ((ACPI_DB_INIT, "System is already in ACPI mode\n"));

        }

        else {

                /* Transition to ACPI mode */

                status = acpi_hw_set_mode (ACPI_SYS_MODE_ACPI);

                if (ACPI_FAILURE (status)) {

                        ACPI_REPORT_ERROR (("Could not transition to ACPI mode.\n"));

                        return_ACPI_STATUS (status);

                }

                ACPI_DEBUG_PRINT ((ACPI_DB_INIT, "Transition to ACPI mode successful\n"));

        }

        return_ACPI_STATUS (status);

}

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

 *

 * FUNCTION:    acpi_disable

 *

 * PARAMETERS:  None

 *

 * RETURN:      Status

 *

 * DESCRIPTION: Transfers the system into LEGACY mode.

 *

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

acpi_status

acpi_disable (void)

{

        acpi_status                     status = AE_OK;

        ACPI_FUNCTION_TRACE ("acpi_disable");

        if (!acpi_gbl_FADT) {

                ACPI_DEBUG_PRINT ((ACPI_DB_WARN, "No FADT information present!\n"));

                return_ACPI_STATUS (AE_NO_ACPI_TABLES);

        }

        if (acpi_hw_get_mode() == ACPI_SYS_MODE_LEGACY) {

                ACPI_DEBUG_PRINT ((ACPI_DB_INIT, "System is already in legacy (non-ACPI) mode\n"));

        }

        else {

                /* Transition to LEGACY mode */

                status = acpi_hw_set_mode (ACPI_SYS_MODE_LEGACY);

                if (ACPI_FAILURE (status)) {

                        ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Could not exit ACPI mode to legacy mode"));

                        return_ACPI_STATUS (status);

                }

                ACPI_DEBUG_PRINT ((ACPI_DB_INIT, "ACPI mode disabled\n"));

        }

        return_ACPI_STATUS (status);

}

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

 *

 * FUNCTION:    acpi_enable_event

 *

 * PARAMETERS:  Event           - The fixed eventto be enabled

 *              Flags           - Reserved

 *

 * RETURN:      Status

 *

 * DESCRIPTION: Enable an ACPI event (fixed)

 *

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

acpi_status

acpi_enable_event (

        u32                             event,

        u32                             flags)

{

        acpi_status                     status = AE_OK;

        u32                             value;

        ACPI_FUNCTION_TRACE ("acpi_enable_event");

        /* Decode the Fixed Event */

        if (event > ACPI_EVENT_MAX) {

                return_ACPI_STATUS (AE_BAD_PARAMETER);

        }

        /*

         * Enable the requested fixed event (by writing a one to the

         * enable register bit)

         */

        status = acpi_set_register (acpi_gbl_fixed_event_info[event].enable_register_id,

                         1, ACPI_MTX_LOCK);

        if (ACPI_FAILURE (status)) {

                return_ACPI_STATUS (status);

        }

        /* Make sure that the hardware responded */

        status = acpi_get_register (acpi_gbl_fixed_event_info[event].enable_register_id,

                          &value, ACPI_MTX_LOCK);

        if (ACPI_FAILURE (status)) {

                return_ACPI_STATUS (status);

        }

        if (value != 1) {

                ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,

                        "Could not enable %s event\n", acpi_ut_get_event_name (event)));

                return_ACPI_STATUS (AE_NO_HARDWARE_RESPONSE);

        }

        return_ACPI_STATUS (status);

}

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

 *

 * FUNCTION:    acpi_enable_gpe

 *

 * PARAMETERS:  gpe_device      - Parent GPE Device

 *              gpe_number      - GPE level within the GPE block

 *              Flags           - Just enable, or also wake enable?

 *                                Called from ISR or not

 *

 * RETURN:      Status

 *

 * DESCRIPTION: Enable an ACPI event (general purpose)

 *

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

acpi_status

acpi_enable_gpe (

        acpi_handle                     gpe_device,

        u32                             gpe_number,

        u32                             flags)

{

        acpi_status                     status = AE_OK;

        struct acpi_gpe_event_info      *gpe_event_info;

        ACPI_FUNCTION_TRACE ("acpi_enable_gpe");

        /* Use semaphore lock if not executing at interrupt level */

        if (flags & ACPI_NOT_ISR) {

                status = acpi_ut_acquire_mutex (ACPI_MTX_EVENTS);

                if (ACPI_FAILURE (status)) {

                        return_ACPI_STATUS (status);

                }

        }

        /* 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;

        }

        /* Check for Wake vs Runtime GPE */

        if (flags & ACPI_EVENT_WAKE_ENABLE) {

                /* Ensure the requested wake GPE is disabled */

                status = acpi_hw_disable_gpe (gpe_event_info);

                if (ACPI_FAILURE (status)) {

                        goto unlock_and_exit;

                }

                /* Defer Enable of Wake GPE until sleep time */

                acpi_hw_enable_gpe_for_wakeup (gpe_event_info);

        }

        else {

                /* Enable the requested runtime GPE  */

                status = acpi_hw_enable_gpe (gpe_event_info);

                if (ACPI_FAILURE (status)) {

                        goto unlock_and_exit;

                }

        }

unlock_and_exit:

        if (flags & ACPI_NOT_ISR) {

                (void) acpi_ut_release_mutex (ACPI_MTX_EVENTS);

        }

        return_ACPI_STATUS (status);

}

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

 *

 * FUNCTION:    acpi_disable_event

 *

 * PARAMETERS:  Event           - The fixed eventto be enabled

 *              Flags           - Reserved

 *

 * RETURN:      Status

 *

 * DESCRIPTION: Disable an ACPI event (fixed)

 *

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

acpi_status

acpi_disable_event (

        u32                             event,

        u32                             flags)

{

        acpi_status                     status = AE_OK;

        u32                             value;

        ACPI_FUNCTION_TRACE ("acpi_disable_event");

        /* Decode the Fixed Event */

        if (event > ACPI_EVENT_MAX) {

                return_ACPI_STATUS (AE_BAD_PARAMETER);

        }

        /*

         * Disable the requested fixed event (by writing a zero to the

         * enable register bit)

         */

        status = acpi_set_register (acpi_gbl_fixed_event_info[event].enable_register_id,

                         0, ACPI_MTX_LOCK);

        if (ACPI_FAILURE (status)) {

                return_ACPI_STATUS (status);

        }

        status = acpi_get_register (acpi_gbl_fixed_event_info[event].enable_register_id,

                         &value, ACPI_MTX_LOCK);

        if (ACPI_FAILURE (status)) {

                return_ACPI_STATUS (status);

        }

        if (value != 0) {

                ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,

                        "Could not disable %s events\n", acpi_ut_get_event_name (event)));

                return_ACPI_STATUS (AE_NO_HARDWARE_RESPONSE);

        }

        return_ACPI_STATUS (status);

}

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

 *

 * FUNCTION:    acpi_disable_gpe

 *

 * PARAMETERS:  gpe_device      - Parent GPE Device

 *              gpe_number      - GPE level within the GPE block

 *              Flags           - Just enable, or also wake enable?

 *                                Called from ISR or not

 *

 * RETURN:      Status

 *

 * DESCRIPTION: Disable an ACPI event (general purpose)

 *

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

acpi_status

acpi_disable_gpe (

        acpi_handle                     gpe_device,

        u32                             gpe_number,

        u32                             flags)

{

        acpi_status                     status = AE_OK;

        struct acpi_gpe_event_info      *gpe_event_info;

        ACPI_FUNCTION_TRACE ("acpi_disable_gpe");

        /* Use semaphore lock if not executing at interrupt level */

        if (flags & ACPI_NOT_ISR) {

                status = acpi_ut_acquire_mutex (ACPI_MTX_EVENTS);

                if (ACPI_FAILURE (status)) {

                        return_ACPI_STATUS (status);

                }

        }

        /* 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;

        }

        /*

         * Only disable the requested GPE number for wake if specified.

         * Otherwise, turn it totally off

         */

        if (flags & ACPI_EVENT_WAKE_DISABLE) {

                acpi_hw_disable_gpe_for_wakeup (gpe_event_info);

        }

        else {

                status = acpi_hw_disable_gpe (gpe_event_info);

        }

unlock_and_exit:

        if (flags & ACPI_NOT_ISR) {

                (void) acpi_ut_release_mutex (ACPI_MTX_EVENTS);

        }

        return_ACPI_STATUS (status);

}

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

 *

 * FUNCTION:    acpi_clear_event

 *

 * PARAMETERS:  Event           - The fixed event to be cleared

 *

 * RETURN:      Status

 *

 * DESCRIPTION: Clear an ACPI event (fixed)

 *

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

acpi_status

acpi_clear_event (

        u32                             event)

{

        acpi_status                     status = AE_OK;

        ACPI_FUNCTION_TRACE ("acpi_clear_event");

        /* Decode the Fixed Event */

        if (event > ACPI_EVENT_MAX) {

                return_ACPI_STATUS (AE_BAD_PARAMETER);

        }

        /*

         * Clear the requested fixed event (By writing a one to the

         * status register bit)

         */

        status = acpi_set_register (acpi_gbl_fixed_event_info[event].status_register_id,

                        1, ACPI_MTX_LOCK);

        return_ACPI_STATUS (status);

}

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

 *

 * FUNCTION:    acpi_clear_gpe

 *

 * PARAMETERS:  gpe_device      - Parent GPE Device

 *              gpe_number      - GPE level within the GPE block

 *              Flags           - Called from an ISR or not

 *

 * RETURN:      Status

 *

 * DESCRIPTION: Clear an ACPI event (general purpose)

 *

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

acpi_status

acpi_clear_gpe (

        acpi_handle                     gpe_device,

        u32                             gpe_number,

        u32                             flags)

{

        acpi_status                     status = AE_OK;

        struct acpi_gpe_event_info      *gpe_event_info;

        ACPI_FUNCTION_TRACE ("acpi_clear_gpe");

        /* Use semaphore lock if not executing at interrupt level */

        if (flags & ACPI_NOT_ISR) {

                status = acpi_ut_acquire_mutex (ACPI_MTX_EVENTS);

                if (ACPI_FAILURE (status)) {

                        return_ACPI_STATUS (status);

                }

        }

        /* 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;

        }

        status = acpi_hw_clear_gpe (gpe_event_info);

unlock_and_exit:

        if (flags & ACPI_NOT_ISR) {

                (void) acpi_ut_release_mutex (ACPI_MTX_EVENTS);

        }

        return_ACPI_STATUS (status);

}

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

 *

 * FUNCTION:    acpi_get_event_status

 *

 * PARAMETERS:  Event           - The fixed event

 *              Event Status    - Where the current status of the event will

 *                                be returned

 *

 * RETURN:      Status

 *

 * DESCRIPTION: Obtains and returns the current status of the event

 *

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

acpi_status

acpi_get_event_status (

        u32                             event,

        acpi_event_status               *event_status)

{

        acpi_status                     status = AE_OK;

        ACPI_FUNCTION_TRACE ("acpi_get_event_status");

        if (!event_status) {

                return_ACPI_STATUS (AE_BAD_PARAMETER);

        }

        /* Decode the Fixed Event */

        if (event > ACPI_EVENT_MAX) {

                return_ACPI_STATUS (AE_BAD_PARAMETER);

        }

        /* Get the status of the requested fixed event */

        status = acpi_get_register (acpi_gbl_fixed_event_info[event].status_register_id,

                          event_status, ACPI_MTX_LOCK);

        return_ACPI_STATUS (status);

}

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

 *

 * FUNCTION:    acpi_get_gpe_status

 *

 * PARAMETERS:  gpe_device      - Parent GPE Device

 *              gpe_number      - GPE level within the GPE block

 *              Flags           - Called from an ISR or not

 *              Event Status    - Where the current status of the event will

 *                                be returned

 *

 * RETURN:      Status

 *

 * DESCRIPTION: Get status of an event (general purpose)

 *

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

acpi_status

acpi_get_gpe_status (

        acpi_handle                     gpe_device,

        u32                             gpe_number,

        u32                             flags,

        acpi_event_status               *event_status)

{

        acpi_status                     status = AE_OK;

        struct acpi_gpe_event_info      *gpe_event_info;

        ACPI_FUNCTION_TRACE ("acpi_get_gpe_status");

        /* Use semaphore lock if not executing at interrupt level */

        if (flags & ACPI_NOT_ISR) {

                status = acpi_ut_acquire_mutex (ACPI_MTX_EVENTS);

                if (ACPI_FAILURE (status)) {

                        return_ACPI_STATUS (status);

                }

        }

        /* 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;

        }

        /* Obtain status on the requested GPE number */

        status = acpi_hw_get_gpe_status (gpe_event_info, event_status);

unlock_and_exit:

        if (flags & ACPI_NOT_ISR) {

                (void) acpi_ut_release_mutex (ACPI_MTX_EVENTS);

        }

        return_ACPI_STATUS (status);

}

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

 *

 * FUNCTION:    acpi_install_gpe_block

 *

 * PARAMETERS:  gpe_device          - Handle to the parent GPE Block Device

 *              gpe_block_address   - Address and space_iD

 *              register_count      - Number of GPE register pairs in the block

 *              interrupt_level     - H/W interrupt for the block

 *

 * RETURN:      Status

 *

 * DESCRIPTION: Create and Install a block of GPE registers

 *

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

acpi_status

acpi_install_gpe_block (

        acpi_handle                     gpe_device,

        struct acpi_generic_address     *gpe_block_address,

        u32                             register_count,

        u32                             interrupt_level)

{

        acpi_status                     status;

        union acpi_operand_object       *obj_desc;

        struct acpi_namespace_node      *node;

        struct acpi_gpe_block_info      *gpe_block;

        ACPI_FUNCTION_TRACE ("acpi_install_gpe_block");

        if ((!gpe_device)      ||

                (!gpe_block_address) ||

                (!register_count)) {

                return_ACPI_STATUS (AE_BAD_PARAMETER);

        }

        status = acpi_ut_acquire_mutex (ACPI_MTX_NAMESPACE);

        if (ACPI_FAILURE (status)) {

                return (status);

        }

        node = acpi_ns_map_handle_to_node (gpe_device);

        if (!node) {

                status = AE_BAD_PARAMETER;

                goto unlock_and_exit;

        }

        /*

         * For user-installed GPE Block Devices, the gpe_block_base_number

         * is always zero

         */

        status = acpi_ev_create_gpe_block (node, gpe_block_address, register_count,

                          0, interrupt_level, &gpe_block);

        if (ACPI_FAILURE (status)) {

                goto unlock_and_exit;

        }

        /* Get the device_object attached to the node */

        obj_desc = acpi_ns_get_attached_object (node);

        if (!obj_desc) {

                /* No object, create a new one */

                obj_desc = acpi_ut_create_internal_object (ACPI_TYPE_DEVICE);

                if (!obj_desc) {

                        status = AE_NO_MEMORY;

                        goto unlock_and_exit;

                }

                status = acpi_ns_attach_object (node, obj_desc, ACPI_TYPE_DEVICE);

                /* Remove local reference to the object */

                acpi_ut_remove_reference (obj_desc);

                if (ACPI_FAILURE (status)) {

                        goto unlock_and_exit;

                }

        }

        /* Install the GPE block in the device_object */

        obj_desc->device.gpe_block = gpe_block;

unlock_and_exit:

        (void) acpi_ut_release_mutex (ACPI_MTX_NAMESPACE);

        return_ACPI_STATUS (status);

}

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

 *

 * FUNCTION:    acpi_remove_gpe_block

 *

 * PARAMETERS:  gpe_device          - Handle to the parent GPE Block Device

 *

 * RETURN:      Status

 *

 * DESCRIPTION: Remove a previously installed block of GPE registers

 *

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

acpi_status

acpi_remove_gpe_block (

        acpi_handle                     gpe_device)

{

        union acpi_operand_object       *obj_desc;

        acpi_status                     status;

        struct acpi_namespace_node      *node;

        ACPI_FUNCTION_TRACE ("acpi_remove_gpe_block");

        if (!gpe_device) {

                return_ACPI_STATUS (AE_BAD_PARAMETER);

        }

        status = acpi_ut_acquire_mutex (ACPI_MTX_NAMESPACE);

        if (ACPI_FAILURE (status)) {

                return (status);

        }

        node = acpi_ns_map_handle_to_node (gpe_device);

        if (!node) {

                status = AE_BAD_PARAMETER;

                goto unlock_and_exit;

        }

        /* Get the device_object attached to the node */

        obj_desc = acpi_ns_get_attached_object (node);

        if (!obj_desc ||

                !obj_desc->device.gpe_block) {

                return_ACPI_STATUS (AE_NULL_OBJECT);

        }

        /* Delete the GPE block (but not the device_object) */

        status = acpi_ev_delete_gpe_block (obj_desc->device.gpe_block);

        if (ACPI_SUCCESS (status)) {

                obj_desc->device.gpe_block = NULL;

        }

unlock_and_exit:

        (void) acpi_ut_release_mutex (ACPI_MTX_NAMESPACE);

        return_ACPI_STATUS (status);

}