/drivers/acpi/acpica/evmisc.c
http://github.com/mirrors/linux · C · 273 lines · 136 code · 55 blank · 82 comment · 21 complexity · dc4a08967606fb7fbce7a06b99f46870 MD5 · raw file
- // SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
- /******************************************************************************
- *
- * Module Name: evmisc - Miscellaneous event manager support functions
- *
- * Copyright (C) 2000 - 2020, 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);
- if (ACPI_FAILURE(status)) {
- ACPI_EXCEPTION((AE_INFO, status,
- "Could not disable GPEs in GPE block"));
- }
- status = acpi_ev_remove_global_lock_handler();
- if (ACPI_FAILURE(status)) {
- ACPI_EXCEPTION((AE_INFO, status,
- "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);
- if (ACPI_FAILURE(status)) {
- ACPI_EXCEPTION((AE_INFO, status,
- "Could not delete GPE handlers"));
- }
- /* 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 */