995 строки
29 KiB
C
995 строки
29 KiB
C
/*******************************************************************************
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*
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* Module Name: nsxfeval - Public interfaces to the ACPI subsystem
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* ACPI Object evaluation interfaces
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*
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******************************************************************************/
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/*
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* Copyright (C) 2000 - 2016, Intel Corp.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions, and the following disclaimer,
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* without modification.
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* 2. Redistributions in binary form must reproduce at minimum a disclaimer
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* substantially similar to the "NO WARRANTY" disclaimer below
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* ("Disclaimer") and any redistribution must be conditioned upon
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* including a substantially similar Disclaimer requirement for further
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* binary redistribution.
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* 3. Neither the names of the above-listed copyright holders nor the names
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* of any contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* Alternatively, this software may be distributed under the terms of the
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* GNU General Public License ("GPL") version 2 as published by the Free
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* Software Foundation.
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*
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* NO WARRANTY
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGES.
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*/
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#define EXPORT_ACPI_INTERFACES
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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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#include "acinterp.h"
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#define _COMPONENT ACPI_NAMESPACE
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ACPI_MODULE_NAME("nsxfeval")
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/* Local prototypes */
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static void acpi_ns_resolve_references(struct acpi_evaluate_info *info);
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/*******************************************************************************
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*
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* FUNCTION: acpi_evaluate_object_typed
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*
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* PARAMETERS: handle - Object handle (optional)
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* pathname - Object pathname (optional)
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* external_params - List of parameters to pass to method,
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* terminated by NULL. May be NULL
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* if no parameters are being passed.
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* return_buffer - Where to put method's return value (if
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* any). If NULL, no value is returned.
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* return_type - Expected type of return object
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*
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* RETURN: Status
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*
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* DESCRIPTION: Find and evaluate the given object, passing the given
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* parameters if necessary. One of "Handle" or "Pathname" must
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* be valid (non-null)
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*
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******************************************************************************/
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acpi_status
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acpi_evaluate_object_typed(acpi_handle handle,
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acpi_string pathname,
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struct acpi_object_list *external_params,
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struct acpi_buffer *return_buffer,
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acpi_object_type return_type)
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{
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acpi_status status;
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u8 free_buffer_on_error = FALSE;
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ACPI_FUNCTION_TRACE(acpi_evaluate_object_typed);
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/* Return buffer must be valid */
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if (!return_buffer) {
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return_ACPI_STATUS(AE_BAD_PARAMETER);
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}
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if (return_buffer->length == ACPI_ALLOCATE_BUFFER) {
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free_buffer_on_error = TRUE;
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}
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/* Evaluate the object */
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status = acpi_evaluate_object(handle, pathname,
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external_params, return_buffer);
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if (ACPI_FAILURE(status)) {
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return_ACPI_STATUS(status);
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}
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/* Type ANY means "don't care" */
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if (return_type == ACPI_TYPE_ANY) {
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return_ACPI_STATUS(AE_OK);
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}
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if (return_buffer->length == 0) {
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/* Error because caller specifically asked for a return value */
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ACPI_ERROR((AE_INFO, "No return value"));
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return_ACPI_STATUS(AE_NULL_OBJECT);
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}
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/* Examine the object type returned from evaluate_object */
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if (((union acpi_object *)return_buffer->pointer)->type == return_type) {
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return_ACPI_STATUS(AE_OK);
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}
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/* Return object type does not match requested type */
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ACPI_ERROR((AE_INFO,
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"Incorrect return type [%s] requested [%s]",
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acpi_ut_get_type_name(((union acpi_object *)return_buffer->
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pointer)->type),
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acpi_ut_get_type_name(return_type)));
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if (free_buffer_on_error) {
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/*
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* Free a buffer created via ACPI_ALLOCATE_BUFFER.
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* Note: We use acpi_os_free here because acpi_os_allocate was used
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* to allocate the buffer. This purposefully bypasses the
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* (optionally enabled) allocation tracking mechanism since we
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* only want to track internal allocations.
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*/
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acpi_os_free(return_buffer->pointer);
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return_buffer->pointer = NULL;
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}
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return_buffer->length = 0;
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return_ACPI_STATUS(AE_TYPE);
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}
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ACPI_EXPORT_SYMBOL(acpi_evaluate_object_typed)
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/*******************************************************************************
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*
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* FUNCTION: acpi_evaluate_object
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*
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* PARAMETERS: handle - Object handle (optional)
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* pathname - Object pathname (optional)
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* external_params - List of parameters to pass to method,
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* terminated by NULL. May be NULL
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* if no parameters are being passed.
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* return_buffer - Where to put method's return value (if
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* any). If NULL, no value is returned.
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*
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* RETURN: Status
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*
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* DESCRIPTION: Find and evaluate the given object, passing the given
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* parameters if necessary. One of "Handle" or "Pathname" must
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* be valid (non-null)
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*
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******************************************************************************/
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acpi_status
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acpi_evaluate_object(acpi_handle handle,
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acpi_string pathname,
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struct acpi_object_list *external_params,
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struct acpi_buffer *return_buffer)
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{
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acpi_status status;
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struct acpi_evaluate_info *info;
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acpi_size buffer_space_needed;
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u32 i;
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ACPI_FUNCTION_TRACE(acpi_evaluate_object);
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/* Allocate and initialize 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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/* Convert and validate the device handle */
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info->prefix_node = acpi_ns_validate_handle(handle);
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if (!info->prefix_node) {
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status = AE_BAD_PARAMETER;
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goto cleanup;
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}
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/*
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* Get the actual namespace node for the target object.
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* Handles these cases:
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*
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* 1) Null node, valid pathname from root (absolute path)
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* 2) Node and valid pathname (path relative to Node)
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* 3) Node, Null pathname
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*/
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if ((pathname) && (ACPI_IS_ROOT_PREFIX(pathname[0]))) {
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/* The path is fully qualified, just evaluate by name */
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info->prefix_node = NULL;
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} else if (!handle) {
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/*
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* A handle is optional iff a fully qualified pathname is specified.
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* Since we've already handled fully qualified names above, this is
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* an error.
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*/
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if (!pathname) {
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ACPI_DEBUG_PRINT((ACPI_DB_INFO,
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"Both Handle and Pathname are NULL"));
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} else {
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ACPI_DEBUG_PRINT((ACPI_DB_INFO,
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"Null Handle with relative pathname [%s]",
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pathname));
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}
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status = AE_BAD_PARAMETER;
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goto cleanup;
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}
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info->relative_pathname = pathname;
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/*
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* Convert all external objects passed as arguments to the
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* internal version(s).
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*/
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if (external_params && external_params->count) {
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info->param_count = (u16)external_params->count;
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/* Warn on impossible argument count */
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if (info->param_count > ACPI_METHOD_NUM_ARGS) {
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ACPI_WARN_PREDEFINED((AE_INFO, pathname,
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ACPI_WARN_ALWAYS,
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"Excess arguments (%u) - using only %u",
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info->param_count,
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ACPI_METHOD_NUM_ARGS));
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info->param_count = ACPI_METHOD_NUM_ARGS;
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}
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/*
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* Allocate a new parameter block for the internal objects
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* Add 1 to count to allow for null terminated internal list
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*/
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info->parameters = ACPI_ALLOCATE_ZEROED(((acpi_size)info->
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param_count +
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1) * sizeof(void *));
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if (!info->parameters) {
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status = AE_NO_MEMORY;
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goto cleanup;
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}
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/* Convert each external object in the list to an internal object */
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for (i = 0; i < info->param_count; i++) {
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status =
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acpi_ut_copy_eobject_to_iobject(&external_params->
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pointer[i],
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&info->
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parameters[i]);
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if (ACPI_FAILURE(status)) {
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goto cleanup;
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}
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}
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info->parameters[info->param_count] = NULL;
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}
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#ifdef _FUTURE_FEATURE
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/*
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* Begin incoming argument count analysis. Check for too few args
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* and too many args.
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*/
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switch (acpi_ns_get_type(info->node)) {
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case ACPI_TYPE_METHOD:
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/* Check incoming argument count against the method definition */
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if (info->obj_desc->method.param_count > info->param_count) {
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ACPI_ERROR((AE_INFO,
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"Insufficient arguments (%u) - %u are required",
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info->param_count,
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info->obj_desc->method.param_count));
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status = AE_MISSING_ARGUMENTS;
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goto cleanup;
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}
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else if (info->obj_desc->method.param_count < info->param_count) {
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ACPI_WARNING((AE_INFO,
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"Excess arguments (%u) - only %u are required",
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info->param_count,
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info->obj_desc->method.param_count));
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/* Just pass the required number of arguments */
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info->param_count = info->obj_desc->method.param_count;
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}
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/*
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* Any incoming external objects to be passed as arguments to the
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* method must be converted to internal objects
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*/
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if (info->param_count) {
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/*
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* Allocate a new parameter block for the internal objects
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* Add 1 to count to allow for null terminated internal list
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*/
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info->parameters = ACPI_ALLOCATE_ZEROED(((acpi_size)
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info->
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param_count +
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1) *
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sizeof(void *));
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if (!info->parameters) {
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status = AE_NO_MEMORY;
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goto cleanup;
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}
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/* Convert each external object in the list to an internal object */
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for (i = 0; i < info->param_count; i++) {
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status =
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acpi_ut_copy_eobject_to_iobject
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(&external_params->pointer[i],
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&info->parameters[i]);
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if (ACPI_FAILURE(status)) {
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goto cleanup;
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}
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}
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info->parameters[info->param_count] = NULL;
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}
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break;
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default:
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/* Warn if arguments passed to an object that is not a method */
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if (info->param_count) {
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ACPI_WARNING((AE_INFO,
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"%u arguments were passed to a non-method ACPI object",
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info->param_count));
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}
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break;
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}
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#endif
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/* Now we can evaluate the object */
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status = acpi_ns_evaluate(info);
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/*
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* If we are expecting a return value, and all went well above,
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* copy the return value to an external object.
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*/
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if (!return_buffer) {
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goto cleanup_return_object;
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}
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if (!info->return_object) {
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return_buffer->length = 0;
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goto cleanup;
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}
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if (ACPI_GET_DESCRIPTOR_TYPE(info->return_object) ==
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ACPI_DESC_TYPE_NAMED) {
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/*
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* If we received a NS Node as a return object, this means that
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* the object we are evaluating has nothing interesting to
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* return (such as a mutex, etc.) We return an error because
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* these types are essentially unsupported by this interface.
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* We don't check up front because this makes it easier to add
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* support for various types at a later date if necessary.
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*/
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status = AE_TYPE;
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info->return_object = NULL; /* No need to delete a NS Node */
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return_buffer->length = 0;
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}
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if (ACPI_FAILURE(status)) {
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goto cleanup_return_object;
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}
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/* Dereference Index and ref_of references */
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acpi_ns_resolve_references(info);
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/* Get the size of the returned object */
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status = acpi_ut_get_object_size(info->return_object,
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&buffer_space_needed);
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if (ACPI_SUCCESS(status)) {
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/* Validate/Allocate/Clear caller buffer */
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status = acpi_ut_initialize_buffer(return_buffer,
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buffer_space_needed);
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if (ACPI_FAILURE(status)) {
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/*
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* Caller's buffer is too small or a new one can't
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* be allocated
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*/
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ACPI_DEBUG_PRINT((ACPI_DB_INFO,
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"Needed buffer size %X, %s\n",
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(u32)buffer_space_needed,
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acpi_format_exception(status)));
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} else {
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/* We have enough space for the object, build it */
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status =
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acpi_ut_copy_iobject_to_eobject(info->return_object,
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return_buffer);
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}
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}
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cleanup_return_object:
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if (info->return_object) {
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/*
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* Delete the internal return object. NOTE: Interpreter must be
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* locked to avoid race condition.
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*/
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acpi_ex_enter_interpreter();
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/* Remove one reference on the return object (should delete it) */
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acpi_ut_remove_reference(info->return_object);
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acpi_ex_exit_interpreter();
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}
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cleanup:
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/* Free the input parameter list (if we created one) */
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if (info->parameters) {
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/* Free the allocated parameter block */
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acpi_ut_delete_internal_object_list(info->parameters);
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}
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ACPI_FREE(info);
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return_ACPI_STATUS(status);
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}
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ACPI_EXPORT_SYMBOL(acpi_evaluate_object)
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/*******************************************************************************
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*
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* FUNCTION: acpi_ns_resolve_references
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*
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* PARAMETERS: info - Evaluation info block
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*
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* RETURN: Info->return_object is replaced with the dereferenced object
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*
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* DESCRIPTION: Dereference certain reference objects. Called before an
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* internal return object is converted to an external union acpi_object.
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*
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* Performs an automatic dereference of Index and ref_of reference objects.
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* These reference objects are not supported by the union acpi_object, so this is a
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* last resort effort to return something useful. Also, provides compatibility
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* with other ACPI implementations.
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*
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* NOTE: does not handle references within returned package objects or nested
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* references, but this support could be added later if found to be necessary.
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*
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******************************************************************************/
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static void acpi_ns_resolve_references(struct acpi_evaluate_info *info)
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{
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union acpi_operand_object *obj_desc = NULL;
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struct acpi_namespace_node *node;
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/* We are interested in reference objects only */
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if ((info->return_object)->common.type != ACPI_TYPE_LOCAL_REFERENCE) {
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return;
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}
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/*
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* Two types of references are supported - those created by Index and
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* ref_of operators. A name reference (AML_NAMEPATH_OP) can be converted
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* to an union acpi_object, so it is not dereferenced here. A ddb_handle
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* (AML_LOAD_OP) cannot be dereferenced, nor can it be converted to
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* an union acpi_object.
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*/
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switch (info->return_object->reference.class) {
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case ACPI_REFCLASS_INDEX:
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obj_desc = *(info->return_object->reference.where);
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break;
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case ACPI_REFCLASS_REFOF:
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node = info->return_object->reference.object;
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if (node) {
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obj_desc = node->object;
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}
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break;
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default:
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return;
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}
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/* Replace the existing reference object */
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if (obj_desc) {
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acpi_ut_add_reference(obj_desc);
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acpi_ut_remove_reference(info->return_object);
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info->return_object = obj_desc;
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}
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return;
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_walk_namespace
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*
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* PARAMETERS: type - acpi_object_type to search for
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* start_object - Handle in namespace where search begins
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* max_depth - Depth to which search is to reach
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* descending_callback - Called during tree descent
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* when an object of "Type" is found
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* ascending_callback - Called during tree ascent
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* when an object of "Type" is found
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* context - Passed to user function(s) above
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* return_value - Location where return value of
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* user_function is put if terminated early
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*
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* RETURNS Return value from the user_function if terminated early.
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* Otherwise, returns NULL.
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*
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* DESCRIPTION: Performs a modified depth-first walk of the namespace tree,
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* starting (and ending) at the object specified by start_handle.
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* The callback function is called whenever an object that matches
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* the type parameter is found. If the callback function returns
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* a non-zero value, the search is terminated immediately and this
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* value is returned to the caller.
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*
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* The point of this procedure is to provide a generic namespace
|
|
* walk routine that can be called from multiple places to
|
|
* provide multiple services; the callback function(s) can be
|
|
* tailored to each task, whether it is a print function,
|
|
* a compare function, etc.
|
|
*
|
|
******************************************************************************/
|
|
|
|
acpi_status
|
|
acpi_walk_namespace(acpi_object_type type,
|
|
acpi_handle start_object,
|
|
u32 max_depth,
|
|
acpi_walk_callback descending_callback,
|
|
acpi_walk_callback ascending_callback,
|
|
void *context, void **return_value)
|
|
{
|
|
acpi_status status;
|
|
|
|
ACPI_FUNCTION_TRACE(acpi_walk_namespace);
|
|
|
|
/* Parameter validation */
|
|
|
|
if ((type > ACPI_TYPE_LOCAL_MAX) ||
|
|
(!max_depth) || (!descending_callback && !ascending_callback)) {
|
|
return_ACPI_STATUS(AE_BAD_PARAMETER);
|
|
}
|
|
|
|
/*
|
|
* Need to acquire the namespace reader lock to prevent interference
|
|
* with any concurrent table unloads (which causes the deletion of
|
|
* namespace objects). We cannot allow the deletion of a namespace node
|
|
* while the user function is using it. The exception to this are the
|
|
* nodes created and deleted during control method execution -- these
|
|
* nodes are marked as temporary nodes and are ignored by the namespace
|
|
* walk. Thus, control methods can be executed while holding the
|
|
* namespace deletion lock (and the user function can execute control
|
|
* methods.)
|
|
*/
|
|
status = acpi_ut_acquire_read_lock(&acpi_gbl_namespace_rw_lock);
|
|
if (ACPI_FAILURE(status)) {
|
|
return_ACPI_STATUS(status);
|
|
}
|
|
|
|
/*
|
|
* Lock the namespace around the walk. The namespace will be
|
|
* unlocked/locked around each call to the user function - since the user
|
|
* function must be allowed to make ACPICA calls itself (for example, it
|
|
* will typically execute control methods during device enumeration.)
|
|
*/
|
|
status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
|
|
if (ACPI_FAILURE(status)) {
|
|
goto unlock_and_exit;
|
|
}
|
|
|
|
/* Now we can validate the starting node */
|
|
|
|
if (!acpi_ns_validate_handle(start_object)) {
|
|
status = AE_BAD_PARAMETER;
|
|
goto unlock_and_exit2;
|
|
}
|
|
|
|
status = acpi_ns_walk_namespace(type, start_object, max_depth,
|
|
ACPI_NS_WALK_UNLOCK,
|
|
descending_callback, ascending_callback,
|
|
context, return_value);
|
|
|
|
unlock_and_exit2:
|
|
(void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
|
|
|
|
unlock_and_exit:
|
|
(void)acpi_ut_release_read_lock(&acpi_gbl_namespace_rw_lock);
|
|
return_ACPI_STATUS(status);
|
|
}
|
|
|
|
ACPI_EXPORT_SYMBOL(acpi_walk_namespace)
|
|
|
|
/*******************************************************************************
|
|
*
|
|
* FUNCTION: acpi_ns_get_device_callback
|
|
*
|
|
* PARAMETERS: Callback from acpi_get_device
|
|
*
|
|
* RETURN: Status
|
|
*
|
|
* DESCRIPTION: Takes callbacks from walk_namespace and filters out all non-
|
|
* present devices, or if they specified a HID, it filters based
|
|
* on that.
|
|
*
|
|
******************************************************************************/
|
|
static acpi_status
|
|
acpi_ns_get_device_callback(acpi_handle obj_handle,
|
|
u32 nesting_level,
|
|
void *context, void **return_value)
|
|
{
|
|
struct acpi_get_devices_info *info = context;
|
|
acpi_status status;
|
|
struct acpi_namespace_node *node;
|
|
u32 flags;
|
|
struct acpi_pnp_device_id *hid;
|
|
struct acpi_pnp_device_id_list *cid;
|
|
u32 i;
|
|
u8 found;
|
|
int no_match;
|
|
|
|
status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
|
|
if (ACPI_FAILURE(status)) {
|
|
return (status);
|
|
}
|
|
|
|
node = acpi_ns_validate_handle(obj_handle);
|
|
status = acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
|
|
if (ACPI_FAILURE(status)) {
|
|
return (status);
|
|
}
|
|
|
|
if (!node) {
|
|
return (AE_BAD_PARAMETER);
|
|
}
|
|
|
|
/*
|
|
* First, filter based on the device HID and CID.
|
|
*
|
|
* 01/2010: For this case where a specific HID is requested, we don't
|
|
* want to run _STA until we have an actual HID match. Thus, we will
|
|
* not unnecessarily execute _STA on devices for which the caller
|
|
* doesn't care about. Previously, _STA was executed unconditionally
|
|
* on all devices found here.
|
|
*
|
|
* A side-effect of this change is that now we will continue to search
|
|
* for a matching HID even under device trees where the parent device
|
|
* would have returned a _STA that indicates it is not present or
|
|
* not functioning (thus aborting the search on that branch).
|
|
*/
|
|
if (info->hid != NULL) {
|
|
status = acpi_ut_execute_HID(node, &hid);
|
|
if (status == AE_NOT_FOUND) {
|
|
return (AE_OK);
|
|
} else if (ACPI_FAILURE(status)) {
|
|
return (AE_CTRL_DEPTH);
|
|
}
|
|
|
|
no_match = strcmp(hid->string, info->hid);
|
|
ACPI_FREE(hid);
|
|
|
|
if (no_match) {
|
|
/*
|
|
* HID does not match, attempt match within the
|
|
* list of Compatible IDs (CIDs)
|
|
*/
|
|
status = acpi_ut_execute_CID(node, &cid);
|
|
if (status == AE_NOT_FOUND) {
|
|
return (AE_OK);
|
|
} else if (ACPI_FAILURE(status)) {
|
|
return (AE_CTRL_DEPTH);
|
|
}
|
|
|
|
/* Walk the CID list */
|
|
|
|
found = FALSE;
|
|
for (i = 0; i < cid->count; i++) {
|
|
if (strcmp(cid->ids[i].string, info->hid) == 0) {
|
|
|
|
/* Found a matching CID */
|
|
|
|
found = TRUE;
|
|
break;
|
|
}
|
|
}
|
|
|
|
ACPI_FREE(cid);
|
|
if (!found) {
|
|
return (AE_OK);
|
|
}
|
|
}
|
|
}
|
|
|
|
/* Run _STA to determine if device is present */
|
|
|
|
status = acpi_ut_execute_STA(node, &flags);
|
|
if (ACPI_FAILURE(status)) {
|
|
return (AE_CTRL_DEPTH);
|
|
}
|
|
|
|
if (!(flags & ACPI_STA_DEVICE_PRESENT) &&
|
|
!(flags & ACPI_STA_DEVICE_FUNCTIONING)) {
|
|
/*
|
|
* Don't examine the children of the device only when the
|
|
* device is neither present nor functional. See ACPI spec,
|
|
* description of _STA for more information.
|
|
*/
|
|
return (AE_CTRL_DEPTH);
|
|
}
|
|
|
|
/* We have a valid device, invoke the user function */
|
|
|
|
status = info->user_function(obj_handle, nesting_level,
|
|
info->context, return_value);
|
|
return (status);
|
|
}
|
|
|
|
/*******************************************************************************
|
|
*
|
|
* FUNCTION: acpi_get_devices
|
|
*
|
|
* PARAMETERS: HID - HID to search for. Can be NULL.
|
|
* user_function - Called when a matching object is found
|
|
* context - Passed to user function
|
|
* return_value - Location where return value of
|
|
* user_function is put if terminated early
|
|
*
|
|
* RETURNS Return value from the user_function if terminated early.
|
|
* Otherwise, returns NULL.
|
|
*
|
|
* DESCRIPTION: Performs a modified depth-first walk of the namespace tree,
|
|
* starting (and ending) at the object specified by start_handle.
|
|
* The user_function is called whenever an object of type
|
|
* Device is found. If the user function returns
|
|
* a non-zero value, the search is terminated immediately and this
|
|
* value is returned to the caller.
|
|
*
|
|
* This is a wrapper for walk_namespace, but the callback performs
|
|
* additional filtering. Please see acpi_ns_get_device_callback.
|
|
*
|
|
******************************************************************************/
|
|
|
|
acpi_status
|
|
acpi_get_devices(const char *HID,
|
|
acpi_walk_callback user_function,
|
|
void *context, void **return_value)
|
|
{
|
|
acpi_status status;
|
|
struct acpi_get_devices_info info;
|
|
|
|
ACPI_FUNCTION_TRACE(acpi_get_devices);
|
|
|
|
/* Parameter validation */
|
|
|
|
if (!user_function) {
|
|
return_ACPI_STATUS(AE_BAD_PARAMETER);
|
|
}
|
|
|
|
/*
|
|
* We're going to call their callback from OUR callback, so we need
|
|
* to know what it is, and their context parameter.
|
|
*/
|
|
info.hid = HID;
|
|
info.context = context;
|
|
info.user_function = user_function;
|
|
|
|
/*
|
|
* Lock the namespace around the walk.
|
|
* The namespace will be unlocked/locked around each call
|
|
* to the user function - since this function
|
|
* must be allowed to make Acpi calls itself.
|
|
*/
|
|
status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
|
|
if (ACPI_FAILURE(status)) {
|
|
return_ACPI_STATUS(status);
|
|
}
|
|
|
|
status = acpi_ns_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
|
|
ACPI_UINT32_MAX, ACPI_NS_WALK_UNLOCK,
|
|
acpi_ns_get_device_callback, NULL,
|
|
&info, return_value);
|
|
|
|
(void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
|
|
return_ACPI_STATUS(status);
|
|
}
|
|
|
|
ACPI_EXPORT_SYMBOL(acpi_get_devices)
|
|
|
|
/*******************************************************************************
|
|
*
|
|
* FUNCTION: acpi_attach_data
|
|
*
|
|
* PARAMETERS: obj_handle - Namespace node
|
|
* handler - Handler for this attachment
|
|
* data - Pointer to data to be attached
|
|
*
|
|
* RETURN: Status
|
|
*
|
|
* DESCRIPTION: Attach arbitrary data and handler to a namespace node.
|
|
*
|
|
******************************************************************************/
|
|
acpi_status
|
|
acpi_attach_data(acpi_handle obj_handle,
|
|
acpi_object_handler handler, void *data)
|
|
{
|
|
struct acpi_namespace_node *node;
|
|
acpi_status status;
|
|
|
|
/* Parameter validation */
|
|
|
|
if (!obj_handle || !handler || !data) {
|
|
return (AE_BAD_PARAMETER);
|
|
}
|
|
|
|
status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
|
|
if (ACPI_FAILURE(status)) {
|
|
return (status);
|
|
}
|
|
|
|
/* Convert and validate the handle */
|
|
|
|
node = acpi_ns_validate_handle(obj_handle);
|
|
if (!node) {
|
|
status = AE_BAD_PARAMETER;
|
|
goto unlock_and_exit;
|
|
}
|
|
|
|
status = acpi_ns_attach_data(node, handler, data);
|
|
|
|
unlock_and_exit:
|
|
(void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
|
|
return (status);
|
|
}
|
|
|
|
ACPI_EXPORT_SYMBOL(acpi_attach_data)
|
|
|
|
/*******************************************************************************
|
|
*
|
|
* FUNCTION: acpi_detach_data
|
|
*
|
|
* PARAMETERS: obj_handle - Namespace node handle
|
|
* handler - Handler used in call to acpi_attach_data
|
|
*
|
|
* RETURN: Status
|
|
*
|
|
* DESCRIPTION: Remove data that was previously attached to a node.
|
|
*
|
|
******************************************************************************/
|
|
acpi_status
|
|
acpi_detach_data(acpi_handle obj_handle, acpi_object_handler handler)
|
|
{
|
|
struct acpi_namespace_node *node;
|
|
acpi_status status;
|
|
|
|
/* Parameter validation */
|
|
|
|
if (!obj_handle || !handler) {
|
|
return (AE_BAD_PARAMETER);
|
|
}
|
|
|
|
status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
|
|
if (ACPI_FAILURE(status)) {
|
|
return (status);
|
|
}
|
|
|
|
/* Convert and validate the handle */
|
|
|
|
node = acpi_ns_validate_handle(obj_handle);
|
|
if (!node) {
|
|
status = AE_BAD_PARAMETER;
|
|
goto unlock_and_exit;
|
|
}
|
|
|
|
status = acpi_ns_detach_data(node, handler);
|
|
|
|
unlock_and_exit:
|
|
(void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
|
|
return (status);
|
|
}
|
|
|
|
ACPI_EXPORT_SYMBOL(acpi_detach_data)
|
|
|
|
/*******************************************************************************
|
|
*
|
|
* FUNCTION: acpi_get_data_full
|
|
*
|
|
* PARAMETERS: obj_handle - Namespace node
|
|
* handler - Handler used in call to attach_data
|
|
* data - Where the data is returned
|
|
* callback - function to execute before returning
|
|
*
|
|
* RETURN: Status
|
|
*
|
|
* DESCRIPTION: Retrieve data that was previously attached to a namespace node
|
|
* and execute a callback before returning.
|
|
*
|
|
******************************************************************************/
|
|
acpi_status
|
|
acpi_get_data_full(acpi_handle obj_handle, acpi_object_handler handler,
|
|
void **data, void (*callback)(void *))
|
|
{
|
|
struct acpi_namespace_node *node;
|
|
acpi_status status;
|
|
|
|
/* Parameter validation */
|
|
|
|
if (!obj_handle || !handler || !data) {
|
|
return (AE_BAD_PARAMETER);
|
|
}
|
|
|
|
status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
|
|
if (ACPI_FAILURE(status)) {
|
|
return (status);
|
|
}
|
|
|
|
/* Convert and validate the handle */
|
|
|
|
node = acpi_ns_validate_handle(obj_handle);
|
|
if (!node) {
|
|
status = AE_BAD_PARAMETER;
|
|
goto unlock_and_exit;
|
|
}
|
|
|
|
status = acpi_ns_get_attached_data(node, handler, data);
|
|
if (ACPI_SUCCESS(status) && callback) {
|
|
callback(*data);
|
|
}
|
|
|
|
unlock_and_exit:
|
|
(void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
|
|
return (status);
|
|
}
|
|
|
|
ACPI_EXPORT_SYMBOL(acpi_get_data_full)
|
|
|
|
/*******************************************************************************
|
|
*
|
|
* FUNCTION: acpi_get_data
|
|
*
|
|
* PARAMETERS: obj_handle - Namespace node
|
|
* handler - Handler used in call to attach_data
|
|
* data - Where the data is returned
|
|
*
|
|
* RETURN: Status
|
|
*
|
|
* DESCRIPTION: Retrieve data that was previously attached to a namespace node.
|
|
*
|
|
******************************************************************************/
|
|
acpi_status
|
|
acpi_get_data(acpi_handle obj_handle, acpi_object_handler handler, void **data)
|
|
{
|
|
return acpi_get_data_full(obj_handle, handler, data, NULL);
|
|
}
|
|
|
|
ACPI_EXPORT_SYMBOL(acpi_get_data)
|