// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
/******************************************************************************
 *
 * Module Name: evmisc - Miscellaneous event manager support functions
 *
 * Copyright (C) 2000 - 2019, Intel Corp.
 *
 *****************************************************************************/

#include <acpi/acpi.h>
#include "accommon.h"
#include "acevents.h"
#include "acnamesp.h"

#define _COMPONENT          ACPI_EVENTS
ACPI_MODULE_NAME("evmisc")

/* Local prototypes */
static void ACPI_SYSTEM_XFACE acpi_ev_notify_dispatch(void *context);

/*******************************************************************************
 *
 * FUNCTION:    acpi_ev_is_notify_object
 *
 * PARAMETERS:  node            - Node to check
 *
 * RETURN:      TRUE if notifies allowed on this object
 *
 * DESCRIPTION: Check type of node for a object that supports notifies.
 *
 *              TBD: This could be replaced by a flag bit in the node.
 *
 ******************************************************************************/

u8 acpi_ev_is_notify_object(struct acpi_namespace_node *node)
{

        switch (node->type) {
        case ACPI_TYPE_DEVICE:
        case ACPI_TYPE_PROCESSOR:
        case ACPI_TYPE_THERMAL:
                /*
                 * These are the ONLY objects that can receive ACPI notifications
                 */
                return (TRUE);

        default:

                return (FALSE);
        }
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ev_queue_notify_request
 *
 * PARAMETERS:  node            - NS node for the notified object
 *              notify_value    - Value from the Notify() request
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Dispatch a device notification event to a previously
 *              installed handler.
 *
 ******************************************************************************/

acpi_status
acpi_ev_queue_notify_request(struct acpi_namespace_node *node, u32 notify_value)
{
        union acpi_operand_object *obj_desc;
        union acpi_operand_object *handler_list_head = NULL;
        union acpi_generic_state *info;
        u8 handler_list_id = 0;
        acpi_status status = AE_OK;

        ACPI_FUNCTION_NAME(ev_queue_notify_request);

        /* Are Notifies allowed on this object? */

        if (!acpi_ev_is_notify_object(node)) {
                return (AE_TYPE);
        }

        /* Get the correct notify list type (System or Device) */

        if (notify_value <= ACPI_MAX_SYS_NOTIFY) {
                handler_list_id = ACPI_SYSTEM_HANDLER_LIST;
        } else {
                handler_list_id = ACPI_DEVICE_HANDLER_LIST;
        }

        /* Get the notify object attached to the namespace Node */

        obj_desc = acpi_ns_get_attached_object(node);
        if (obj_desc) {

                /* We have an attached object, Get the correct handler list */

                handler_list_head =
                    obj_desc->common_notify.notify_list[handler_list_id];
        }

        /*
         * If there is no notify handler (Global or Local)
         * for this object, just ignore the notify
         */
        if (!acpi_gbl_global_notify[handler_list_id].handler
            && !handler_list_head) {
                ACPI_DEBUG_PRINT((ACPI_DB_INFO,
                                  "No notify handler for Notify, ignoring (%4.4s, %X) node %p\n",
                                  acpi_ut_get_node_name(node), notify_value,
                                  node));

                return (AE_OK);
        }

        /* Setup notify info and schedule the notify dispatcher */

        info = acpi_ut_create_generic_state();
        if (!info) {
                return (AE_NO_MEMORY);
        }

        info->common.descriptor_type = ACPI_DESC_TYPE_STATE_NOTIFY;

        info->notify.node = node;
        info->notify.value = (u16)notify_value;
        info->notify.handler_list_id = handler_list_id;
        info->notify.handler_list_head = handler_list_head;
        info->notify.global = &acpi_gbl_global_notify[handler_list_id];

        ACPI_DEBUG_PRINT((ACPI_DB_INFO,
                          "Dispatching Notify on [%4.4s] (%s) Value 0x%2.2X (%s) Node %p\n",
                          acpi_ut_get_node_name(node),
                          acpi_ut_get_type_name(node->type), notify_value,
                          acpi_ut_get_notify_name(notify_value, ACPI_TYPE_ANY),
                          node));

        status = acpi_os_execute(OSL_NOTIFY_HANDLER,
                                 acpi_ev_notify_dispatch, info);
        if (ACPI_FAILURE(status)) {
                acpi_ut_delete_generic_state(info);
        }

        return (status);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ev_notify_dispatch
 *
 * PARAMETERS:  context         - To be passed to the notify handler
 *
 * RETURN:      None.
 *
 * DESCRIPTION: Dispatch a device notification event to a previously
 *              installed handler.
 *
 ******************************************************************************/

static void ACPI_SYSTEM_XFACE acpi_ev_notify_dispatch(void *context)
{
        union acpi_generic_state *info = (union acpi_generic_state *)context;
        union acpi_operand_object *handler_obj;

        ACPI_FUNCTION_ENTRY();

        /* Invoke a global notify handler if installed */

        if (info->notify.global->handler) {
                info->notify.global->handler(info->notify.node,
                                             info->notify.value,
                                             info->notify.global->context);
        }

        /* Now invoke the local notify handler(s) if any are installed */

        handler_obj = info->notify.handler_list_head;
        while (handler_obj) {
                handler_obj->notify.handler(info->notify.node,
                                            info->notify.value,
                                            handler_obj->notify.context);

                handler_obj =
                    handler_obj->notify.next[info->notify.handler_list_id];
        }

        /* All done with the info object */

        acpi_ut_delete_generic_state(info);
}

#if (!ACPI_REDUCED_HARDWARE)
/******************************************************************************
 *
 * FUNCTION:    acpi_ev_terminate
 *
 * PARAMETERS:  none
 *
 * RETURN:      none
 *
 * DESCRIPTION: Disable events and free memory allocated for table storage.
 *
 ******************************************************************************/

void acpi_ev_terminate(void)
{
        u32 i;
        acpi_status status;

        ACPI_FUNCTION_TRACE(ev_terminate);

        if (acpi_gbl_events_initialized) {
                /*
                 * Disable all event-related functionality. In all cases, on error,
                 * print a message but obviously we don't abort.
                 */

                /* Disable all fixed events */

                for (i = 0; i < ACPI_NUM_FIXED_EVENTS; i++) {
                        status = acpi_disable_event(i, 0);
                        if (ACPI_FAILURE(status)) {
                                ACPI_ERROR((AE_INFO,
                                            "Could not disable fixed event %u",
                                            (u32) i));
                        }
                }

                /* Disable all GPEs in all GPE blocks */

                status = acpi_ev_walk_gpe_list(acpi_hw_disable_gpe_block, NULL);

                status = acpi_ev_remove_global_lock_handler();
                if (ACPI_FAILURE(status)) {
                        ACPI_ERROR((AE_INFO,
                                    "Could not remove Global Lock handler"));
                }

                acpi_gbl_events_initialized = FALSE;
        }

        /* Remove SCI handlers */

        status = acpi_ev_remove_all_sci_handlers();
        if (ACPI_FAILURE(status)) {
                ACPI_ERROR((AE_INFO, "Could not remove SCI handler"));
        }

        /* Deallocate all handler objects installed within GPE info structs */

        status = acpi_ev_walk_gpe_list(acpi_ev_delete_gpe_handlers, NULL);

        /* Return to original mode if necessary */

        if (acpi_gbl_original_mode == ACPI_SYS_MODE_LEGACY) {
                status = acpi_disable();
                if (ACPI_FAILURE(status)) {
                        ACPI_WARNING((AE_INFO, "AcpiDisable failed"));
                }
        }
        return_VOID;
}

#endif                          /* !ACPI_REDUCED_HARDWARE */