linux/drivers/acpi/acpica/nsxfname.c

511 lines
14 KiB
C

/******************************************************************************
*
* Module Name: nsxfname - Public interfaces to the ACPI subsystem
* ACPI Namespace oriented interfaces
*
*****************************************************************************/
/*
* Copyright (C) 2000 - 2008, 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"
#include "acparser.h"
#include "amlcode.h"
#define _COMPONENT ACPI_NAMESPACE
ACPI_MODULE_NAME("nsxfname")
/******************************************************************************
*
* FUNCTION: acpi_get_handle
*
* PARAMETERS: Parent - Object to search under (search scope).
* Pathname - Pointer to an asciiz string containing the
* name
* ret_handle - Where the return handle is returned
*
* RETURN: Status
*
* DESCRIPTION: This routine will search for a caller specified name in the
* name space. The caller can restrict the search region by
* specifying a non NULL parent. The parent value is itself a
* namespace handle.
*
******************************************************************************/
acpi_status
acpi_get_handle(acpi_handle parent,
acpi_string pathname, acpi_handle * ret_handle)
{
acpi_status status;
struct acpi_namespace_node *node = NULL;
struct acpi_namespace_node *prefix_node = NULL;
ACPI_FUNCTION_ENTRY();
/* Parameter Validation */
if (!ret_handle || !pathname) {
return (AE_BAD_PARAMETER);
}
/* Convert a parent handle to a prefix node */
if (parent) {
prefix_node = acpi_ns_map_handle_to_node(parent);
if (!prefix_node) {
return (AE_BAD_PARAMETER);
}
}
/*
* Valid cases are:
* 1) Fully qualified pathname
* 2) Parent + Relative pathname
*
* Error for <null Parent + relative path>
*/
if (acpi_ns_valid_root_prefix(pathname[0])) {
/* Pathname is fully qualified (starts with '\') */
/* Special case for root-only, since we can't search for it */
if (!ACPI_STRCMP(pathname, ACPI_NS_ROOT_PATH)) {
*ret_handle =
acpi_ns_convert_entry_to_handle(acpi_gbl_root_node);
return (AE_OK);
}
} else if (!prefix_node) {
/* Relative path with null prefix is disallowed */
return (AE_BAD_PARAMETER);
}
/* Find the Node and convert to a handle */
status =
acpi_ns_get_node(prefix_node, pathname, ACPI_NS_NO_UPSEARCH, &node);
if (ACPI_SUCCESS(status)) {
*ret_handle = acpi_ns_convert_entry_to_handle(node);
}
return (status);
}
ACPI_EXPORT_SYMBOL(acpi_get_handle)
/******************************************************************************
*
* FUNCTION: acpi_get_name
*
* PARAMETERS: Handle - Handle to be converted to a pathname
* name_type - Full pathname or single segment
* Buffer - Buffer for returned path
*
* RETURN: Pointer to a string containing the fully qualified Name.
*
* DESCRIPTION: This routine returns the fully qualified name associated with
* the Handle parameter. This and the acpi_pathname_to_handle are
* complementary functions.
*
******************************************************************************/
acpi_status
acpi_get_name(acpi_handle handle, u32 name_type, struct acpi_buffer * buffer)
{
acpi_status status;
struct acpi_namespace_node *node;
/* Parameter validation */
if (name_type > ACPI_NAME_TYPE_MAX) {
return (AE_BAD_PARAMETER);
}
status = acpi_ut_validate_buffer(buffer);
if (ACPI_FAILURE(status)) {
return (status);
}
if (name_type == ACPI_FULL_PATHNAME) {
/* Get the full pathname (From the namespace root) */
status = acpi_ns_handle_to_pathname(handle, buffer);
return (status);
}
/*
* Wants the single segment ACPI name.
* Validate handle and convert to a namespace Node
*/
status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
if (ACPI_FAILURE(status)) {
return (status);
}
node = acpi_ns_map_handle_to_node(handle);
if (!node) {
status = AE_BAD_PARAMETER;
goto unlock_and_exit;
}
/* Validate/Allocate/Clear caller buffer */
status = acpi_ut_initialize_buffer(buffer, ACPI_PATH_SEGMENT_LENGTH);
if (ACPI_FAILURE(status)) {
goto unlock_and_exit;
}
/* Just copy the ACPI name from the Node and zero terminate it */
ACPI_STRNCPY(buffer->pointer, acpi_ut_get_node_name(node),
ACPI_NAME_SIZE);
((char *)buffer->pointer)[ACPI_NAME_SIZE] = 0;
status = AE_OK;
unlock_and_exit:
(void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
return (status);
}
ACPI_EXPORT_SYMBOL(acpi_get_name)
/******************************************************************************
*
* FUNCTION: acpi_get_object_info
*
* PARAMETERS: Handle - Object Handle
* Buffer - Where the info is returned
*
* RETURN: Status
*
* DESCRIPTION: Returns information about an object as gleaned from the
* namespace node and possibly by running several standard
* control methods (Such as in the case of a device.)
*
******************************************************************************/
acpi_status
acpi_get_object_info(acpi_handle handle, struct acpi_buffer * buffer)
{
acpi_status status;
struct acpi_namespace_node *node;
struct acpi_device_info *info;
struct acpi_device_info *return_info;
struct acpi_compatible_id_list *cid_list = NULL;
acpi_size size;
/* Parameter validation */
if (!handle || !buffer) {
return (AE_BAD_PARAMETER);
}
status = acpi_ut_validate_buffer(buffer);
if (ACPI_FAILURE(status)) {
return (status);
}
info = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_device_info));
if (!info) {
return (AE_NO_MEMORY);
}
status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
if (ACPI_FAILURE(status)) {
goto cleanup;
}
node = acpi_ns_map_handle_to_node(handle);
if (!node) {
(void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
status = AE_BAD_PARAMETER;
goto cleanup;
}
/* Init return structure */
size = sizeof(struct acpi_device_info);
info->type = node->type;
info->name = node->name.integer;
info->valid = 0;
if (node->type == ACPI_TYPE_METHOD) {
info->param_count = node->object->method.param_count;
}
status = acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
if (ACPI_FAILURE(status)) {
goto cleanup;
}
/* If not a device, we are all done */
if (info->type == ACPI_TYPE_DEVICE) {
/*
* Get extra info for ACPI Devices objects only:
* Run the Device _HID, _UID, _CID, _STA, _ADR and _sx_d methods.
*
* Note: none of these methods are required, so they may or may
* not be present for this device. The Info->Valid bitfield is used
* to indicate which methods were found and ran successfully.
*/
/* Execute the Device._HID method */
status = acpi_ut_execute_HID(node, &info->hardware_id);
if (ACPI_SUCCESS(status)) {
info->valid |= ACPI_VALID_HID;
}
/* Execute the Device._UID method */
status = acpi_ut_execute_UID(node, &info->unique_id);
if (ACPI_SUCCESS(status)) {
info->valid |= ACPI_VALID_UID;
}
/* Execute the Device._CID method */
status = acpi_ut_execute_CID(node, &cid_list);
if (ACPI_SUCCESS(status)) {
size += cid_list->size;
info->valid |= ACPI_VALID_CID;
}
/* Execute the Device._STA method */
status = acpi_ut_execute_STA(node, &info->current_status);
if (ACPI_SUCCESS(status)) {
info->valid |= ACPI_VALID_STA;
}
/* Execute the Device._ADR method */
status = acpi_ut_evaluate_numeric_object(METHOD_NAME__ADR, node,
&info->address);
if (ACPI_SUCCESS(status)) {
info->valid |= ACPI_VALID_ADR;
}
/* Execute the Device._sx_d methods */
status = acpi_ut_execute_sxds(node, info->highest_dstates);
if (ACPI_SUCCESS(status)) {
info->valid |= ACPI_VALID_SXDS;
}
}
/* Validate/Allocate/Clear caller buffer */
status = acpi_ut_initialize_buffer(buffer, size);
if (ACPI_FAILURE(status)) {
goto cleanup;
}
/* Populate the return buffer */
return_info = buffer->pointer;
ACPI_MEMCPY(return_info, info, sizeof(struct acpi_device_info));
if (cid_list) {
ACPI_MEMCPY(&return_info->compatibility_id, cid_list,
cid_list->size);
}
cleanup:
ACPI_FREE(info);
if (cid_list) {
ACPI_FREE(cid_list);
}
return (status);
}
ACPI_EXPORT_SYMBOL(acpi_get_object_info)
/******************************************************************************
*
* FUNCTION: acpi_install_method
*
* PARAMETERS: Buffer - An ACPI table containing one control method
*
* RETURN: Status
*
* DESCRIPTION: Install a control method into the namespace. If the method
* name already exists in the namespace, it is overwritten. The
* input buffer must contain a valid DSDT or SSDT containing a
* single control method.
*
******************************************************************************/
acpi_status acpi_install_method(u8 *buffer)
{
struct acpi_table_header *table =
ACPI_CAST_PTR(struct acpi_table_header, buffer);
u8 *aml_buffer;
u8 *aml_start;
char *path;
struct acpi_namespace_node *node;
union acpi_operand_object *method_obj;
struct acpi_parse_state parser_state;
u32 aml_length;
u16 opcode;
u8 method_flags;
acpi_status status;
/* Parameter validation */
if (!buffer) {
return AE_BAD_PARAMETER;
}
/* Table must be a DSDT or SSDT */
if (!ACPI_COMPARE_NAME(table->signature, ACPI_SIG_DSDT) &&
!ACPI_COMPARE_NAME(table->signature, ACPI_SIG_SSDT)) {
return AE_BAD_HEADER;
}
/* First AML opcode in the table must be a control method */
parser_state.aml = buffer + sizeof(struct acpi_table_header);
opcode = acpi_ps_peek_opcode(&parser_state);
if (opcode != AML_METHOD_OP) {
return AE_BAD_PARAMETER;
}
/* Extract method information from the raw AML */
parser_state.aml += acpi_ps_get_opcode_size(opcode);
parser_state.pkg_end = acpi_ps_get_next_package_end(&parser_state);
path = acpi_ps_get_next_namestring(&parser_state);
method_flags = *parser_state.aml++;
aml_start = parser_state.aml;
aml_length = ACPI_PTR_DIFF(parser_state.pkg_end, aml_start);
/*
* Allocate resources up-front. We don't want to have to delete a new
* node from the namespace if we cannot allocate memory.
*/
aml_buffer = ACPI_ALLOCATE(aml_length);
if (!aml_buffer) {
return AE_NO_MEMORY;
}
method_obj = acpi_ut_create_internal_object(ACPI_TYPE_METHOD);
if (!method_obj) {
ACPI_FREE(aml_buffer);
return AE_NO_MEMORY;
}
/* Lock namespace for acpi_ns_lookup, we may be creating a new node */
status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
if (ACPI_FAILURE(status)) {
goto error_exit;
}
/* The lookup either returns an existing node or creates a new one */
status =
acpi_ns_lookup(NULL, path, ACPI_TYPE_METHOD, ACPI_IMODE_LOAD_PASS1,
ACPI_NS_DONT_OPEN_SCOPE | ACPI_NS_ERROR_IF_FOUND,
NULL, &node);
(void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
if (ACPI_FAILURE(status)) { /* ns_lookup */
if (status != AE_ALREADY_EXISTS) {
goto error_exit;
}
/* Node existed previously, make sure it is a method node */
if (node->type != ACPI_TYPE_METHOD) {
status = AE_TYPE;
goto error_exit;
}
}
/* Copy the method AML to the local buffer */
ACPI_MEMCPY(aml_buffer, aml_start, aml_length);
/* Initialize the method object with the new method's information */
method_obj->method.aml_start = aml_buffer;
method_obj->method.aml_length = aml_length;
method_obj->method.param_count = (u8)
(method_flags & AML_METHOD_ARG_COUNT);
method_obj->method.method_flags = (u8)
(method_flags & ~AML_METHOD_ARG_COUNT);
if (method_flags & AML_METHOD_SERIALIZED) {
method_obj->method.sync_level = (u8)
((method_flags & AML_METHOD_SYNC_LEVEL) >> 4);
}
/*
* Now that it is complete, we can attach the new method object to
* the method Node (detaches/deletes any existing object)
*/
status = acpi_ns_attach_object(node, method_obj, ACPI_TYPE_METHOD);
/*
* Flag indicates AML buffer is dynamic, must be deleted later.
* Must be set only after attach above.
*/
node->flags |= ANOBJ_ALLOCATED_BUFFER;
/* Remove local reference to the method object */
acpi_ut_remove_reference(method_obj);
return status;
error_exit:
ACPI_FREE(aml_buffer);
ACPI_FREE(method_obj);
return status;
}
ACPI_EXPORT_SYMBOL(acpi_install_method)