- 根目录:
- drivers
- acpi
- acpica
- uteval.c
/******************************************************************************
*
* Module Name: uteval - Object evaluation
*
*****************************************************************************/
/*
* Copyright (C) 2000 - 2014, 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 "acnamesp.h"
#define _COMPONENT ACPI_UTILITIES
ACPI_MODULE_NAME("uteval")
/*******************************************************************************
*
* FUNCTION: acpi_ut_evaluate_object
*
* PARAMETERS: prefix_node - Starting node
* path - Path to object from starting node
* expected_return_types - Bitmap of allowed return types
* return_desc - Where a return value is stored
*
* RETURN: Status
*
* DESCRIPTION: Evaluates a namespace object and verifies the type of the
* return object. Common code that simplifies accessing objects
* that have required return objects of fixed types.
*
* NOTE: Internal function, no parameter validation
*
******************************************************************************/
acpi_status
acpi_ut_evaluate_object(struct acpi_namespace_node *prefix_node,
char *path,
u32 expected_return_btypes,
union acpi_operand_object **return_desc)
{
struct acpi_evaluate_info *info;
acpi_status status;
u32 return_btype;
ACPI_FUNCTION_TRACE(ut_evaluate_object);
/* Allocate the evaluation information block */
info = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_evaluate_info));
if (!info) {
return_ACPI_STATUS(AE_NO_MEMORY);
}
info->prefix_node = prefix_node;
info->relative_pathname = path;
/* Evaluate the object/method */
status = acpi_ns_evaluate(info);
if (ACPI_FAILURE(status)) {
if (status == AE_NOT_FOUND) {
ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
"[%4.4s.%s] was not found\n",
acpi_ut_get_node_name(prefix_node),
path));
} else {
ACPI_ERROR_METHOD("Method execution failed",
prefix_node, path, status);
}
goto cleanup;
}
/* Did we get a return object? */
if (!info->return_object) {
if (expected_return_btypes) {
ACPI_ERROR_METHOD("No object was returned from",
prefix_node, path, AE_NOT_EXIST);
status = AE_NOT_EXIST;
}
goto cleanup;
}
/* Map the return object type to the bitmapped type */
switch ((info->return_object)->common.type) {
case ACPI_TYPE_INTEGER:
return_btype = ACPI_BTYPE_INTEGER;
break;
case ACPI_TYPE_BUFFER:
return_btype = ACPI_BTYPE_BUFFER;
break;
case ACPI_TYPE_STRING:
return_btype = ACPI_BTYPE_STRING;
break;
case ACPI_TYPE_PACKAGE:
return_btype = ACPI_BTYPE_PACKAGE;
break;
default:
return_btype = 0;
break;
}
if ((acpi_gbl_enable_interpreter_slack) && (!expected_return_btypes)) {
/*
* We received a return object, but one was not expected. This can
* happen frequently if the "implicit return" feature is enabled.
* Just delete the return object and return AE_OK.
*/
acpi_ut_remove_reference(info->return_object);
goto cleanup;
}
/* Is the return object one of the expected types? */
if (!(expected_return_btypes & return_btype)) {
ACPI_ERROR_METHOD("Return object type is incorrect",
prefix_node, path, AE_TYPE);
ACPI_ERROR((AE_INFO,
"Type returned from %s was incorrect: %s, expected Btypes: 0x%X",
path,
acpi_ut_get_object_type_name(info->return_object),
expected_return_btypes));
/* On error exit, we must delete the return object */
acpi_ut_remove_reference(info->return_object);
status = AE_TYPE;
goto cleanup;
}
/* Object type is OK, return it */
*return_desc = info->return_object;
cleanup:
ACPI_FREE(info);
return_ACPI_STATUS(status);
}
/*******************************************************************************
*
* FUNCTION: acpi_ut_evaluate_numeric_object
*
* PARAMETERS: object_name - Object name to be evaluated
* device_node - Node for the device
* value - Where the value is returned
*
* RETURN: Status
*
* DESCRIPTION: Evaluates a numeric namespace object for a selected device
* and stores result in *Value.
*
* NOTE: Internal function, no parameter validation
*
******************************************************************************/
acpi_status
acpi_ut_evaluate_numeric_object(char *object_name,
struct acpi_namespace_node *device_node,
u64 *value)
{
union acpi_operand_object *obj_desc;
acpi_status status;
ACPI_FUNCTION_TRACE(ut_evaluate_numeric_object);
status = acpi_ut_evaluate_object(device_node, object_name,
ACPI_BTYPE_INTEGER, &obj_desc);
if (ACPI_FAILURE(status)) {
return_ACPI_STATUS(status);
}
/* Get the returned Integer */
*value = obj_desc->integer.value;
/* On exit, we must delete the return object */
acpi_ut_remove_reference(obj_desc);
return_ACPI_STATUS(status);
}
/*******************************************************************************
*
* FUNCTION: acpi_ut_execute_STA
*
* PARAMETERS: device_node - Node for the device
* flags - Where the status flags are returned
*
* RETURN: Status
*
* DESCRIPTION: Executes _STA for selected device and stores results in
* *Flags. If _STA does not exist, then the device is assumed
* to be present/functional/enabled (as per the ACPI spec).
*
* NOTE: Internal function, no parameter validation
*
******************************************************************************/
acpi_status
acpi_ut_execute_STA(struct acpi_namespace_node *device_node, u32 * flags)
{
union acpi_operand_object *obj_desc;
acpi_status status;
ACPI_FUNCTION_TRACE(ut_execute_STA);
status = acpi_ut_evaluate_object(device_node, METHOD_NAME__STA,
ACPI_BTYPE_INTEGER, &obj_desc);
if (ACPI_FAILURE(status)) {
if (AE_NOT_FOUND == status) {
/*
* if _STA does not exist, then (as per the ACPI specification),
* the returned flags will indicate that the device is present,
* functional, and enabled.
*/
ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
"_STA on %4.4s was not found, assuming device is present\n",
acpi_ut_get_node_name(device_node)));
*flags = ACPI_UINT32_MAX;
status = AE_OK;
}
return_ACPI_STATUS(status);
}
/* Extract the status flags */
*flags = (u32) obj_desc->integer.value;
/* On exit, we must delete the return object */
acpi_ut_remove_reference(obj_desc);
return_ACPI_STATUS(status);
}
/*******************************************************************************
*
* FUNCTION: acpi_ut_execute_power_methods
*
* PARAMETERS: device_node - Node for the device
* method_names - Array of power method names
* method_count - Number of methods to execute
* out_values - Where the power method values are returned
*
* RETURN: Status, out_values
*
* DESCRIPTION: Executes the specified power methods for the device and returns
* the result(s).
*
* NOTE: Internal function, no parameter validation
*
******************************************************************************/
acpi_status
acpi_ut_execute_power_methods(struct acpi_namespace_node *device_node,
const char **method_names,
u8 method_count, u8 *out_values)
{
union acpi_operand_object *obj_desc;
acpi_status status;
acpi_status final_status = AE_NOT_FOUND;
u32 i;
ACPI_FUNCTION_TRACE(ut_execute_power_methods);
for (i = 0; i < method_count; i++) {
/*
* Execute the power method (_sx_d or _sx_w). The only allowable
* return type is an Integer.
*/
status = acpi_ut_evaluate_object(device_node,
ACPI_CAST_PTR(char,
method_names[i]),
ACPI_BTYPE_INTEGER, &obj_desc);
if (ACPI_SUCCESS(status)) {
out_values[i] = (u8)obj_desc->integer.value;
/* Delete the return object */
acpi_ut_remove_reference(obj_desc);
final_status = AE_OK; /* At least one value is valid */
continue;
}
out_values[i] = ACPI_UINT8_MAX;
if (status == AE_NOT_FOUND) {
continue; /* Ignore if not found */
}
ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
"Failed %s on Device %4.4s, %s\n",
ACPI_CAST_PTR(char, method_names[i]),
acpi_ut_get_node_name(device_node),
acpi_format_exception(status)));
}
return_ACPI_STATUS(final_status);
}