316 lines
8.4 KiB
C
316 lines
8.4 KiB
C
// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
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/******************************************************************************
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*
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* Module Name: uteval - Object evaluation
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*
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* Copyright (C) 2000 - 2021, Intel Corp.
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*
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*****************************************************************************/
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#include <acpi/acpi.h>
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#include "accommon.h"
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#include "acnamesp.h"
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#define _COMPONENT ACPI_UTILITIES
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ACPI_MODULE_NAME("uteval")
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/*******************************************************************************
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*
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* FUNCTION: acpi_ut_evaluate_object
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*
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* PARAMETERS: prefix_node - Starting node
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* path - Path to object from starting node
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* expected_return_types - Bitmap of allowed return types
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* return_desc - Where a return value is stored
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*
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* RETURN: Status
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*
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* DESCRIPTION: Evaluates a namespace object and verifies the type of the
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* return object. Common code that simplifies accessing objects
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* that have required return objects of fixed types.
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*
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* NOTE: Internal function, no parameter validation
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*
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******************************************************************************/
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acpi_status
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acpi_ut_evaluate_object(struct acpi_namespace_node *prefix_node,
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const char *path,
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u32 expected_return_btypes,
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union acpi_operand_object **return_desc)
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{
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struct acpi_evaluate_info *info;
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acpi_status status;
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u32 return_btype;
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ACPI_FUNCTION_TRACE(ut_evaluate_object);
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/* Allocate the evaluation information block */
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info = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_evaluate_info));
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if (!info) {
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return_ACPI_STATUS(AE_NO_MEMORY);
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}
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info->prefix_node = prefix_node;
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info->relative_pathname = path;
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/* Evaluate the object/method */
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status = acpi_ns_evaluate(info);
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if (ACPI_FAILURE(status)) {
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if (status == AE_NOT_FOUND) {
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ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
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"[%4.4s.%s] was not found\n",
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acpi_ut_get_node_name(prefix_node),
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path));
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} else {
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ACPI_ERROR_METHOD("Method execution failed",
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prefix_node, path, status);
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}
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goto cleanup;
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}
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/* Did we get a return object? */
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if (!info->return_object) {
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if (expected_return_btypes) {
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ACPI_ERROR_METHOD("No object was returned from",
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prefix_node, path, AE_NOT_EXIST);
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status = AE_NOT_EXIST;
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}
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goto cleanup;
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}
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/* Map the return object type to the bitmapped type */
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switch ((info->return_object)->common.type) {
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case ACPI_TYPE_INTEGER:
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return_btype = ACPI_BTYPE_INTEGER;
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break;
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case ACPI_TYPE_BUFFER:
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return_btype = ACPI_BTYPE_BUFFER;
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break;
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case ACPI_TYPE_STRING:
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return_btype = ACPI_BTYPE_STRING;
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break;
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case ACPI_TYPE_PACKAGE:
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return_btype = ACPI_BTYPE_PACKAGE;
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break;
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default:
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return_btype = 0;
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break;
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}
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if ((acpi_gbl_enable_interpreter_slack) && (!expected_return_btypes)) {
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/*
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* We received a return object, but one was not expected. This can
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* happen frequently if the "implicit return" feature is enabled.
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* Just delete the return object and return AE_OK.
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*/
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acpi_ut_remove_reference(info->return_object);
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goto cleanup;
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}
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/* Is the return object one of the expected types? */
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if (!(expected_return_btypes & return_btype)) {
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ACPI_ERROR_METHOD("Return object type is incorrect",
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prefix_node, path, AE_TYPE);
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ACPI_ERROR((AE_INFO,
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"Type returned from %s was incorrect: %s, expected Btypes: 0x%X",
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path,
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acpi_ut_get_object_type_name(info->return_object),
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expected_return_btypes));
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/* On error exit, we must delete the return object */
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acpi_ut_remove_reference(info->return_object);
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status = AE_TYPE;
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goto cleanup;
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}
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/* Object type is OK, return it */
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*return_desc = info->return_object;
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cleanup:
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ACPI_FREE(info);
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return_ACPI_STATUS(status);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ut_evaluate_numeric_object
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*
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* PARAMETERS: object_name - Object name to be evaluated
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* device_node - Node for the device
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* value - Where the value is returned
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*
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* RETURN: Status
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*
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* DESCRIPTION: Evaluates a numeric namespace object for a selected device
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* and stores result in *Value.
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*
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* NOTE: Internal function, no parameter validation
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*
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******************************************************************************/
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acpi_status
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acpi_ut_evaluate_numeric_object(const char *object_name,
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struct acpi_namespace_node *device_node,
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u64 *value)
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{
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union acpi_operand_object *obj_desc;
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acpi_status status;
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ACPI_FUNCTION_TRACE(ut_evaluate_numeric_object);
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status = acpi_ut_evaluate_object(device_node, object_name,
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ACPI_BTYPE_INTEGER, &obj_desc);
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if (ACPI_FAILURE(status)) {
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return_ACPI_STATUS(status);
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}
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/* Get the returned Integer */
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*value = obj_desc->integer.value;
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/* On exit, we must delete the return object */
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acpi_ut_remove_reference(obj_desc);
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return_ACPI_STATUS(status);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ut_execute_STA
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*
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* PARAMETERS: device_node - Node for the device
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* flags - Where the status flags are returned
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*
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* RETURN: Status
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*
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* DESCRIPTION: Executes _STA for selected device and stores results in
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* *Flags. If _STA does not exist, then the device is assumed
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* to be present/functional/enabled (as per the ACPI spec).
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*
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* NOTE: Internal function, no parameter validation
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*
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******************************************************************************/
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acpi_status
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acpi_ut_execute_STA(struct acpi_namespace_node *device_node, u32 * flags)
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{
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union acpi_operand_object *obj_desc;
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acpi_status status;
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ACPI_FUNCTION_TRACE(ut_execute_STA);
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status = acpi_ut_evaluate_object(device_node, METHOD_NAME__STA,
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ACPI_BTYPE_INTEGER, &obj_desc);
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if (ACPI_FAILURE(status)) {
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if (AE_NOT_FOUND == status) {
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/*
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* if _STA does not exist, then (as per the ACPI specification),
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* the returned flags will indicate that the device is present,
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* functional, and enabled.
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*/
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ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
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"_STA on %4.4s was not found, assuming device is present\n",
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acpi_ut_get_node_name(device_node)));
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*flags = ACPI_UINT32_MAX;
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status = AE_OK;
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}
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return_ACPI_STATUS(status);
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}
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/* Extract the status flags */
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*flags = (u32) obj_desc->integer.value;
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/* On exit, we must delete the return object */
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acpi_ut_remove_reference(obj_desc);
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return_ACPI_STATUS(status);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ut_execute_power_methods
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*
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* PARAMETERS: device_node - Node for the device
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* method_names - Array of power method names
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* method_count - Number of methods to execute
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* out_values - Where the power method values are returned
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*
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* RETURN: Status, out_values
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*
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* DESCRIPTION: Executes the specified power methods for the device and returns
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* the result(s).
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*
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* NOTE: Internal function, no parameter validation
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*
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******************************************************************************/
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acpi_status
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acpi_ut_execute_power_methods(struct acpi_namespace_node *device_node,
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const char **method_names,
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u8 method_count, u8 *out_values)
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{
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union acpi_operand_object *obj_desc;
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acpi_status status;
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acpi_status final_status = AE_NOT_FOUND;
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u32 i;
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ACPI_FUNCTION_TRACE(ut_execute_power_methods);
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for (i = 0; i < method_count; i++) {
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/*
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* Execute the power method (_sx_d or _sx_w). The only allowable
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* return type is an Integer.
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*/
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status = acpi_ut_evaluate_object(device_node,
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ACPI_CAST_PTR(char,
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method_names[i]),
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ACPI_BTYPE_INTEGER, &obj_desc);
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if (ACPI_SUCCESS(status)) {
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out_values[i] = (u8)obj_desc->integer.value;
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/* Delete the return object */
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acpi_ut_remove_reference(obj_desc);
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final_status = AE_OK; /* At least one value is valid */
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continue;
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}
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out_values[i] = ACPI_UINT8_MAX;
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if (status == AE_NOT_FOUND) {
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continue; /* Ignore if not found */
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}
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ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
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"Failed %s on Device %4.4s, %s\n",
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ACPI_CAST_PTR(char, method_names[i]),
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acpi_ut_get_node_name(device_node),
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acpi_format_exception(status)));
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}
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return_ACPI_STATUS(final_status);
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}
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