730 lines
21 KiB
C
730 lines
21 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 - 2005, R. Byron Moore
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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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#include <linux/module.h>
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#include <acpi/acpi.h>
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#include <acpi/acnamesp.h>
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#include <acpi/acinterp.h>
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#define _COMPONENT ACPI_NAMESPACE
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ACPI_MODULE_NAME("nsxfeval")
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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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#ifdef ACPI_FUTURE_USAGE
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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 must_free = 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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must_free = TRUE;
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}
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/* Evaluate the object */
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status =
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acpi_evaluate_object(handle, pathname, external_params,
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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_DEBUG_PRINT((ACPI_DB_ERROR, "No return value\n"));
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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_DEBUG_PRINT((ACPI_DB_ERROR,
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"Incorrect return type [%s] requested [%s]\n",
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acpi_ut_get_type_name(((union acpi_object *)
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return_buffer->pointer)->type),
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acpi_ut_get_type_name(return_type)));
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if (must_free) {
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/* Caller used ACPI_ALLOCATE_BUFFER, free the return buffer */
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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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#endif /* ACPI_FUTURE_USAGE */
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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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acpi_status status2;
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struct acpi_parameter_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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info.node = handle;
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info.parameters = NULL;
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info.return_object = NULL;
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info.parameter_type = ACPI_PARAM_ARGS;
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/*
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* If there are parameters to be passed to the object
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* (which must be a control method), the external objects
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* must be converted to internal objects
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*/
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if (external_params && external_params->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_MEM_CALLOCATE(((acpi_size)
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external_params->count +
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1) * sizeof(void *));
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if (!info.parameters) {
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return_ACPI_STATUS(AE_NO_MEMORY);
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}
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/*
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* Convert each external object in the list to an
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* internal object
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*/
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for (i = 0; i < external_params->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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acpi_ut_delete_internal_object_list(info.
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parameters);
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return_ACPI_STATUS(status);
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}
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}
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info.parameters[external_params->count] = NULL;
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}
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/*
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* Three major cases:
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* 1) Fully qualified pathname
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* 2) No handle, not fully qualified pathname (error)
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* 3) Valid handle
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*/
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if ((pathname) && (acpi_ns_valid_root_prefix(pathname[0]))) {
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/*
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* The path is fully qualified, just evaluate by name
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*/
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status = acpi_ns_evaluate_by_name(pathname, &info);
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} else if (!handle) {
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/*
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* A handle is optional iff a fully qualified pathname
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* is specified. Since we've already handled fully
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* qualified names above, this is an error
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*/
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if (!pathname) {
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ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
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"Both Handle and Pathname are NULL\n"));
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} else {
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ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
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"Handle is NULL and Pathname is relative\n"));
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}
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status = AE_BAD_PARAMETER;
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} else {
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/*
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* We get here if we have a handle -- and if we have a
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* pathname it is relative. The handle will be validated
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* in the lower procedures
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*/
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if (!pathname) {
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/*
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* The null pathname case means the handle is for
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* the actual object to be evaluated
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*/
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status = acpi_ns_evaluate_by_handle(&info);
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} else {
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/*
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* Both a Handle and a relative Pathname
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*/
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status = acpi_ns_evaluate_relative(pathname, &info);
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}
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}
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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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if (!info.return_object) {
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return_buffer->length = 0;
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} else {
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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_SUCCESS(status)) {
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/*
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* Find out how large a buffer is needed
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* to contain the returned object
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*/
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status =
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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 =
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acpi_ut_initialize_buffer
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(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 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)
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buffer_space_needed,
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acpi_format_exception
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(status)));
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} else {
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/*
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* We have enough space for the object, build it
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*/
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status =
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acpi_ut_copy_iobject_to_eobject
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(info.return_object,
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return_buffer);
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}
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}
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}
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}
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}
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if (info.return_object) {
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/*
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* Delete the internal return object. NOTE: Interpreter
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* must be locked to avoid race condition.
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*/
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status2 = acpi_ex_enter_interpreter();
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if (ACPI_SUCCESS(status2)) {
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/*
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* Delete the internal return object. (Or at least
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* decrement the reference count by one)
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*/
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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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}
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/*
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* Free the input parameter list (if we created one),
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*/
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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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return_ACPI_STATUS(status);
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}
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EXPORT_SYMBOL(acpi_evaluate_object);
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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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* user_function - Called when an object of "Type" is found
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* Context - Passed to user function
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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 user_function is called whenever an object that matches
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* the type parameter is found. If the user 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
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* walk routine that can be called from multiple places to
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* provide multiple services; the User Function can be tailored
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* to each task, whether it is a print function, a compare
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* function, etc.
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*
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******************************************************************************/
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acpi_status
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acpi_walk_namespace(acpi_object_type type,
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acpi_handle start_object,
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u32 max_depth,
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acpi_walk_callback user_function,
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void *context, void **return_value)
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{
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acpi_status status;
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ACPI_FUNCTION_TRACE("acpi_walk_namespace");
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/* Parameter validation */
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if ((type > ACPI_TYPE_EXTERNAL_MAX) || (!max_depth) || (!user_function)) {
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return_ACPI_STATUS(AE_BAD_PARAMETER);
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}
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/*
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* Lock the namespace around the walk.
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* The namespace will be unlocked/locked around each call
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* to the user function - since this function
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* must be allowed to make Acpi calls itself.
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*/
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status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
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if (ACPI_FAILURE(status)) {
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return_ACPI_STATUS(status);
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}
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status = acpi_ns_walk_namespace(type, start_object, max_depth,
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ACPI_NS_WALK_UNLOCK,
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user_function, context, return_value);
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(void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
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return_ACPI_STATUS(status);
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}
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EXPORT_SYMBOL(acpi_walk_namespace);
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/*******************************************************************************
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*
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* FUNCTION: acpi_ns_get_device_callback
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*
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* PARAMETERS: Callback from acpi_get_device
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*
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* RETURN: Status
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*
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* DESCRIPTION: Takes callbacks from walk_namespace and filters out all non-
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* present devices, or if they specified a HID, it filters based
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* on that.
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*
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******************************************************************************/
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static acpi_status
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acpi_ns_get_device_callback(acpi_handle obj_handle,
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u32 nesting_level,
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void *context, void **return_value)
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{
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struct acpi_get_devices_info *info = context;
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acpi_status status;
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struct acpi_namespace_node *node;
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u32 flags;
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struct acpi_device_id hid;
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struct acpi_compatible_id_list *cid;
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acpi_native_uint i;
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status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
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if (ACPI_FAILURE(status)) {
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return (status);
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}
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node = acpi_ns_map_handle_to_node(obj_handle);
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status = acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
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if (ACPI_FAILURE(status)) {
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return (status);
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}
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if (!node) {
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return (AE_BAD_PARAMETER);
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}
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/* Run _STA to determine if device is present */
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status = acpi_ut_execute_STA(node, &flags);
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if (ACPI_FAILURE(status)) {
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return (AE_CTRL_DEPTH);
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}
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if (!(flags & 0x01)) {
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/* Don't return at the device or children of the device if not there */
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return (AE_CTRL_DEPTH);
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}
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/* Filter based on device HID & CID */
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if (info->hid != NULL) {
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status = acpi_ut_execute_HID(node, &hid);
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if (status == AE_NOT_FOUND) {
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return (AE_OK);
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} else if (ACPI_FAILURE(status)) {
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return (AE_CTRL_DEPTH);
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}
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if (ACPI_STRNCMP(hid.value, info->hid, sizeof(hid.value)) != 0) {
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/* Get the list of Compatible IDs */
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status = acpi_ut_execute_CID(node, &cid);
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if (status == AE_NOT_FOUND) {
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return (AE_OK);
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} else if (ACPI_FAILURE(status)) {
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return (AE_CTRL_DEPTH);
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}
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/* Walk the CID list */
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for (i = 0; i < cid->count; i++) {
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if (ACPI_STRNCMP(cid->id[i].value, info->hid,
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sizeof(struct
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acpi_compatible_id)) !=
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0) {
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ACPI_MEM_FREE(cid);
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return (AE_OK);
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}
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}
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ACPI_MEM_FREE(cid);
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}
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}
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status = info->user_function(obj_handle, nesting_level, info->context,
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return_value);
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return (status);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_get_devices
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*
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* PARAMETERS: HID - HID to search for. Can be NULL.
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* user_function - Called when a matching object is found
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* Context - Passed to user function
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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 user_function is called whenever an object of type
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* Device is found. If the user 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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* This is a wrapper for walk_namespace, but the callback performs
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|
* additional filtering. Please see acpi_get_device_callback.
|
|
*
|
|
******************************************************************************/
|
|
|
|
acpi_status
|
|
acpi_get_devices(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.context = context;
|
|
info.user_function = user_function;
|
|
info.hid = HID;
|
|
|
|
/*
|
|
* 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, &info,
|
|
return_value);
|
|
|
|
(void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
|
|
return_ACPI_STATUS(status);
|
|
}
|
|
|
|
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_map_handle_to_node(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);
|
|
}
|
|
|
|
/*******************************************************************************
|
|
*
|
|
* 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_map_handle_to_node(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);
|
|
}
|
|
|
|
/*******************************************************************************
|
|
*
|
|
* 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)
|
|
{
|
|
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_map_handle_to_node(obj_handle);
|
|
if (!node) {
|
|
status = AE_BAD_PARAMETER;
|
|
goto unlock_and_exit;
|
|
}
|
|
|
|
status = acpi_ns_get_attached_data(node, handler, data);
|
|
|
|
unlock_and_exit:
|
|
(void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
|
|
return (status);
|
|
}
|