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// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
/******************************************************************************
*
* Module Name: evxfregn - External Interfaces, ACPI Operation Regions and
* Address Spaces.
*
* Copyright (C) 2000 - 2020, Intel Corp.
*
*****************************************************************************/
#define EXPORT_ACPI_INTERFACES
#include <acpi/acpi.h>
#include "accommon.h"
#include "acnamesp.h"
#include "acevents.h"
#define _COMPONENT ACPI_EVENTS
ACPI_MODULE_NAME("evxfregn")
/*******************************************************************************
*
* FUNCTION: acpi_install_address_space_handler
*
* PARAMETERS: device - Handle for the device
* space_id - The address space ID
* handler - Address of the handler
* setup - Address of the setup function
* context - Value passed to the handler on each access
*
* RETURN: Status
*
* DESCRIPTION: Install a handler for all op_regions of a given space_id.
*
* NOTE: This function should only be called after acpi_enable_subsystem has
* been called. This is because any _REG methods associated with the Space ID
* are executed here, and these methods can only be safely executed after
* the default handlers have been installed and the hardware has been
* initialized (via acpi_enable_subsystem.)
*
******************************************************************************/
acpi_status
acpi_install_address_space_handler(acpi_handle device,
acpi_adr_space_type space_id,
acpi_adr_space_handler handler,
acpi_adr_space_setup setup, void *context)
{
struct acpi_namespace_node *node;
acpi_status status;
ACPI_FUNCTION_TRACE(acpi_install_address_space_handler);
/* Parameter validation */
if (!device) {
return_ACPI_STATUS(AE_BAD_PARAMETER);
}
status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
if (ACPI_FAILURE(status)) {
return_ACPI_STATUS(status);
}
/* Convert and validate the device handle */
node = acpi_ns_validate_handle(device);
if (!node) {
status = AE_BAD_PARAMETER;
goto unlock_and_exit;
}
/* Install the handler for all Regions for this Space ID */
status =
acpi_ev_install_space_handler(node, space_id, handler, setup,
context);
if (ACPI_FAILURE(status)) {
goto unlock_and_exit;
}
/* Run all _REG methods for this address space */
acpi_ev_execute_reg_methods(node, space_id, ACPI_REG_CONNECT);
unlock_and_exit:
(void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
return_ACPI_STATUS(status);
}
ACPI_EXPORT_SYMBOL(acpi_install_address_space_handler)
/*******************************************************************************
*
* FUNCTION: acpi_remove_address_space_handler
*
* PARAMETERS: device - Handle for the device
* space_id - The address space ID
* handler - Address of the handler
*
* RETURN: Status
*
* DESCRIPTION: Remove a previously installed handler.
*
******************************************************************************/
acpi_status
acpi_remove_address_space_handler(acpi_handle device,
acpi_adr_space_type space_id,
acpi_adr_space_handler handler)
{
union acpi_operand_object *obj_desc;
union acpi_operand_object *handler_obj;
union acpi_operand_object *region_obj;
union acpi_operand_object **last_obj_ptr;
struct acpi_namespace_node *node;
acpi_status status;
ACPI_FUNCTION_TRACE(acpi_remove_address_space_handler);
/* Parameter validation */
if (!device) {
return_ACPI_STATUS(AE_BAD_PARAMETER);
}
status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
if (ACPI_FAILURE(status)) {
return_ACPI_STATUS(status);
}
/* Convert and validate the device handle */
node = acpi_ns_validate_handle(device);
if (!node ||
((node->type != ACPI_TYPE_DEVICE) &&
(node->type != ACPI_TYPE_PROCESSOR) &&
(node->type != ACPI_TYPE_THERMAL) &&
(node != acpi_gbl_root_node))) {
status = AE_BAD_PARAMETER;
goto unlock_and_exit;
}
/* Make sure the internal object exists */
obj_desc = acpi_ns_get_attached_object(node);
if (!obj_desc) {
status = AE_NOT_EXIST;
goto unlock_and_exit;
}
/* Find the address handler the user requested */
handler_obj = obj_desc->common_notify.handler;
last_obj_ptr = &obj_desc->common_notify.handler;
while (handler_obj) {
/* We have a handler, see if user requested this one */
if (handler_obj->address_space.space_id == space_id) {
/* Handler must be the same as the installed handler */
if (handler_obj->address_space.handler != handler) {
status = AE_BAD_PARAMETER;
goto unlock_and_exit;
}
/* Matched space_id, first dereference this in the Regions */
ACPI_DEBUG_PRINT((ACPI_DB_OPREGION,
"Removing address handler %p(%p) for region %s "
"on Device %p(%p)\n",
handler_obj, handler,
acpi_ut_get_region_name(space_id),
node, obj_desc));
region_obj = handler_obj->address_space.region_list;
/* Walk the handler's region list */
while (region_obj) {
/*
* First disassociate the handler from the region.
*
* NOTE: this doesn't mean that the region goes away
* The region is just inaccessible as indicated to
* the _REG method
*/
acpi_ev_detach_region(region_obj, TRUE);
/*
* Walk the list: Just grab the head because the
* detach_region removed the previous head.
*/
region_obj =
handler_obj->address_space.region_list;
}
/* Remove this Handler object from the list */
*last_obj_ptr = handler_obj->address_space.next;
/* Now we can delete the handler object */
acpi_ut_remove_reference(handler_obj);
goto unlock_and_exit;
}
/* Walk the linked list of handlers */
last_obj_ptr = &handler_obj->address_space.next;
handler_obj = handler_obj->address_space.next;
}
/* The handler does not exist */
ACPI_DEBUG_PRINT((ACPI_DB_OPREGION,
"Unable to remove address handler %p for %s(%X), DevNode %p, obj %p\n",
handler, acpi_ut_get_region_name(space_id), space_id,
node, obj_desc));
status = AE_NOT_EXIST;
unlock_and_exit:
(void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
return_ACPI_STATUS(status);
}
ACPI_EXPORT_SYMBOL(acpi_remove_address_space_handler)
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