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linux/drivers/acpi/utilities/uteval.c

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/******************************************************************************
*
* Module Name: uteval - Object evaluation
*
*****************************************************************************/
/*
* Copyright (C) 2000 - 2005, R. Byron Moore
* 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 <acpi/acnamesp.h>
#include <acpi/acinterp.h>
#define _COMPONENT ACPI_UTILITIES
ACPI_MODULE_NAME("uteval")
/* Local prototypes */
static void
acpi_ut_copy_id_string(char *destination, char *source, acpi_size max_length);
static acpi_status
acpi_ut_translate_one_cid(union acpi_operand_object *obj_desc,
struct acpi_compatible_id *one_cid);
/*******************************************************************************
*
* FUNCTION: acpi_ut_osi_implementation
*
* PARAMETERS: walk_state - Current walk state
*
* RETURN: Status
*
* DESCRIPTION: Implementation of _OSI predefined control method
* Supported = _OSI (String)
*
******************************************************************************/
acpi_status acpi_ut_osi_implementation(struct acpi_walk_state *walk_state)
{
union acpi_operand_object *string_desc;
union acpi_operand_object *return_desc;
acpi_native_uint i;
ACPI_FUNCTION_TRACE("ut_osi_implementation");
/* Validate the string input argument */
string_desc = walk_state->arguments[0].object;
if (!string_desc || (string_desc->common.type != ACPI_TYPE_STRING)) {
return_ACPI_STATUS(AE_TYPE);
}
/* Create a return object (Default value = 0) */
return_desc = acpi_ut_create_internal_object(ACPI_TYPE_INTEGER);
if (!return_desc) {
return_ACPI_STATUS(AE_NO_MEMORY);
}
/* Compare input string to table of supported strings */
for (i = 0; i < ACPI_NUM_OSI_STRINGS; i++) {
if (!ACPI_STRCMP(string_desc->string.pointer,
(char *)acpi_gbl_valid_osi_strings[i])) {
/* This string is supported */
return_desc->integer.value = 0xFFFFFFFF;
break;
}
}
walk_state->return_desc = return_desc;
return_ACPI_STATUS(AE_CTRL_TERMINATE);
}
/*******************************************************************************
*
* 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_parameter_info info;
acpi_status status;
u32 return_btype;
ACPI_FUNCTION_TRACE("ut_evaluate_object");
info.node = prefix_node;
info.parameters = NULL;
info.parameter_type = ACPI_PARAM_ARGS;
/* Evaluate the object/method */
status = acpi_ns_evaluate_relative(path, &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_REPORT_METHOD_ERROR("Method execution failed",
prefix_node, path, status);
}
return_ACPI_STATUS(status);
}
/* Did we get a return object? */
if (!info.return_object) {
if (expected_return_btypes) {
ACPI_REPORT_METHOD_ERROR("No object was returned from",
prefix_node, path,
AE_NOT_EXIST);
return_ACPI_STATUS(AE_NOT_EXIST);
}
return_ACPI_STATUS(AE_OK);
}
/* Map the return object type to the bitmapped type */
switch (ACPI_GET_OBJECT_TYPE(info.return_object)) {
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);
return_ACPI_STATUS(AE_OK);
}
/* Is the return object one of the expected types? */
if (!(expected_return_btypes & return_btype)) {
ACPI_REPORT_METHOD_ERROR("Return object type is incorrect",
prefix_node, path, AE_TYPE);
ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
"Type returned from %s was incorrect: %s, expected Btypes: %X\n",
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);
return_ACPI_STATUS(AE_TYPE);
}
/* Object type is OK, return it */
*return_desc = info.return_object;
return_ACPI_STATUS(AE_OK);
}
/*******************************************************************************
*
* FUNCTION: acpi_ut_evaluate_numeric_object
*
* PARAMETERS: object_name - Object name to be evaluated
* device_node - Node for the device
* Address - Where the value is returned
*
* RETURN: Status
*
* DESCRIPTION: Evaluates a numeric namespace object for a selected device
* and stores result in *Address.
*
* NOTE: Internal function, no parameter validation
*
******************************************************************************/
acpi_status
acpi_ut_evaluate_numeric_object(char *object_name,
struct acpi_namespace_node *device_node,
acpi_integer * address)
{
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 */
*address = 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_copy_id_string
*
* PARAMETERS: Destination - Where to copy the string
* Source - Source string
* max_length - Length of the destination buffer
*
* RETURN: None
*
* DESCRIPTION: Copies an ID string for the _HID, _CID, and _UID methods.
* Performs removal of a leading asterisk if present -- workaround
* for a known issue on a bunch of machines.
*
******************************************************************************/
static void
acpi_ut_copy_id_string(char *destination, char *source, acpi_size max_length)
{
/*
* Workaround for ID strings that have a leading asterisk. This construct
* is not allowed by the ACPI specification (ID strings must be
* alphanumeric), but enough existing machines have this embedded in their
* ID strings that the following code is useful.
*/
if (*source == '*') {
source++;
}
/* Do the actual copy */
ACPI_STRNCPY(destination, source, max_length);
}
/*******************************************************************************
*
* FUNCTION: acpi_ut_execute_HID
*
* PARAMETERS: device_node - Node for the device
* Hid - Where the HID is returned
*
* RETURN: Status
*
* DESCRIPTION: Executes the _HID control method that returns the hardware
* ID of the device.
*
* NOTE: Internal function, no parameter validation
*
******************************************************************************/
acpi_status
acpi_ut_execute_HID(struct acpi_namespace_node *device_node,
struct acpi_device_id *hid)
{
union acpi_operand_object *obj_desc;
acpi_status status;
ACPI_FUNCTION_TRACE("ut_execute_HID");
status = acpi_ut_evaluate_object(device_node, METHOD_NAME__HID,
ACPI_BTYPE_INTEGER | ACPI_BTYPE_STRING,
&obj_desc);
if (ACPI_FAILURE(status)) {
return_ACPI_STATUS(status);
}
if (ACPI_GET_OBJECT_TYPE(obj_desc) == ACPI_TYPE_INTEGER) {
/* Convert the Numeric HID to string */
acpi_ex_eisa_id_to_string((u32) obj_desc->integer.value,
hid->value);
} else {
/* Copy the String HID from the returned object */
acpi_ut_copy_id_string(hid->value, obj_desc->string.pointer,
sizeof(hid->value));
}
/* On exit, we must delete the return object */
acpi_ut_remove_reference(obj_desc);
return_ACPI_STATUS(status);
}
/*******************************************************************************
*
* FUNCTION: acpi_ut_translate_one_cid
*
* PARAMETERS: obj_desc - _CID object, must be integer or string
* one_cid - Where the CID string is returned
*
* RETURN: Status
*
* DESCRIPTION: Return a numeric or string _CID value as a string.
* (Compatible ID)
*
* NOTE: Assumes a maximum _CID string length of
* ACPI_MAX_CID_LENGTH.
*
******************************************************************************/
static acpi_status
acpi_ut_translate_one_cid(union acpi_operand_object *obj_desc,
struct acpi_compatible_id *one_cid)
{
switch (ACPI_GET_OBJECT_TYPE(obj_desc)) {
case ACPI_TYPE_INTEGER:
/* Convert the Numeric CID to string */
acpi_ex_eisa_id_to_string((u32) obj_desc->integer.value,
one_cid->value);
return (AE_OK);
case ACPI_TYPE_STRING:
if (obj_desc->string.length > ACPI_MAX_CID_LENGTH) {
return (AE_AML_STRING_LIMIT);
}
/* Copy the String CID from the returned object */
acpi_ut_copy_id_string(one_cid->value, obj_desc->string.pointer,
ACPI_MAX_CID_LENGTH);
return (AE_OK);
default:
return (AE_TYPE);
}
}
/*******************************************************************************
*
* FUNCTION: acpi_ut_execute_CID
*
* PARAMETERS: device_node - Node for the device
* return_cid_list - Where the CID list is returned
*
* RETURN: Status
*
* DESCRIPTION: Executes the _CID control method that returns one or more
* compatible hardware IDs for the device.
*
* NOTE: Internal function, no parameter validation
*
******************************************************************************/
acpi_status
acpi_ut_execute_CID(struct acpi_namespace_node * device_node,
struct acpi_compatible_id_list ** return_cid_list)
{
union acpi_operand_object *obj_desc;
acpi_status status;
u32 count;
u32 size;
struct acpi_compatible_id_list *cid_list;
acpi_native_uint i;
ACPI_FUNCTION_TRACE("ut_execute_CID");
/* Evaluate the _CID method for this device */
status = acpi_ut_evaluate_object(device_node, METHOD_NAME__CID,
ACPI_BTYPE_INTEGER | ACPI_BTYPE_STRING
| ACPI_BTYPE_PACKAGE, &obj_desc);
if (ACPI_FAILURE(status)) {
return_ACPI_STATUS(status);
}
/* Get the number of _CIDs returned */
count = 1;
if (ACPI_GET_OBJECT_TYPE(obj_desc) == ACPI_TYPE_PACKAGE) {
count = obj_desc->package.count;
}
/* Allocate a worst-case buffer for the _CIDs */
size = (((count - 1) * sizeof(struct acpi_compatible_id)) +
sizeof(struct acpi_compatible_id_list));
cid_list = ACPI_MEM_CALLOCATE((acpi_size) size);
if (!cid_list) {
return_ACPI_STATUS(AE_NO_MEMORY);
}
/* Init CID list */
cid_list->count = count;
cid_list->size = size;
/*
* A _CID can return either a single compatible ID or a package of
* compatible IDs. Each compatible ID can be one of the following:
* 1) Integer (32 bit compressed EISA ID) or
* 2) String (PCI ID format, e.g. "PCI\VEN_vvvv&DEV_dddd&SUBSYS_ssssssss")
*/
/* The _CID object can be either a single CID or a package (list) of CIDs */
if (ACPI_GET_OBJECT_TYPE(obj_desc) == ACPI_TYPE_PACKAGE) {
/* Translate each package element */
for (i = 0; i < count; i++) {
status =
acpi_ut_translate_one_cid(obj_desc->package.
elements[i],
&cid_list->id[i]);
if (ACPI_FAILURE(status)) {
break;
}
}
} else {
/* Only one CID, translate to a string */
status = acpi_ut_translate_one_cid(obj_desc, cid_list->id);
}
/* Cleanup on error */
if (ACPI_FAILURE(status)) {
ACPI_MEM_FREE(cid_list);
} else {
*return_cid_list = cid_list;
}
/* On exit, we must delete the _CID return object */
acpi_ut_remove_reference(obj_desc);
return_ACPI_STATUS(status);
}
/*******************************************************************************
*
* FUNCTION: acpi_ut_execute_UID
*
* PARAMETERS: device_node - Node for the device
* Uid - Where the UID is returned
*
* RETURN: Status
*
* DESCRIPTION: Executes the _UID control method that returns the hardware
* ID of the device.
*
* NOTE: Internal function, no parameter validation
*
******************************************************************************/
acpi_status
acpi_ut_execute_UID(struct acpi_namespace_node *device_node,
struct acpi_device_id *uid)
{
union acpi_operand_object *obj_desc;
acpi_status status;
ACPI_FUNCTION_TRACE("ut_execute_UID");
status = acpi_ut_evaluate_object(device_node, METHOD_NAME__UID,
ACPI_BTYPE_INTEGER | ACPI_BTYPE_STRING,
&obj_desc);
if (ACPI_FAILURE(status)) {
return_ACPI_STATUS(status);
}
if (ACPI_GET_OBJECT_TYPE(obj_desc) == ACPI_TYPE_INTEGER) {
/* Convert the Numeric UID to string */
acpi_ex_unsigned_integer_to_string(obj_desc->integer.value,
uid->value);
} else {
/* Copy the String UID from the returned object */
acpi_ut_copy_id_string(uid->value, obj_desc->string.pointer,
sizeof(uid->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.
*
* 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) {
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 = 0x0F;
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_Sxds
*
* 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.
*
* NOTE: Internal function, no parameter validation
*
******************************************************************************/
acpi_status
acpi_ut_execute_sxds(struct acpi_namespace_node *device_node, u8 * highest)
{
union acpi_operand_object *obj_desc;
acpi_status status;
u32 i;
ACPI_FUNCTION_TRACE("ut_execute_Sxds");
for (i = 0; i < 4; i++) {
highest[i] = 0xFF;
status = acpi_ut_evaluate_object(device_node,
(char *)
acpi_gbl_highest_dstate_names
[i], ACPI_BTYPE_INTEGER,
&obj_desc);
if (ACPI_FAILURE(status)) {
if (status != AE_NOT_FOUND) {
ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
"%s on Device %4.4s, %s\n",
(char *)
acpi_gbl_highest_dstate_names
[i],
acpi_ut_get_node_name
(device_node),
acpi_format_exception
(status)));
return_ACPI_STATUS(status);
}
} else {
/* Extract the Dstate value */
highest[i] = (u8) obj_desc->integer.value;
/* Delete the return object */
acpi_ut_remove_reference(obj_desc);
}
}
return_ACPI_STATUS(AE_OK);
}
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