evmisc.c

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/******************************************************************************
 *
 * Module Name: evmisc - Miscellaneous event manager support functions
 *
 *****************************************************************************/

/*
 * 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("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), 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);

        /* Remove SCI handler */

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

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