nseval.c

linux-2.6.15.6

/*******************************************************************************
 *
 * Module Name: nseval - Object evaluation interfaces -- includes control
 *                       method lookup and execution.
 *
 ******************************************************************************/

/*
 * Copyright (C) 2000 - 2005, R. Byron Moore
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions, and the following disclaimer,
 *    without modification.
 * 2. Redistributions in binary form must reproduce at minimum a disclaimer
 *    substantially similar to the "NO WARRANTY" disclaimer below
 *    ("Disclaimer") and any redistribution must be conditioned upon
 *    including a substantially similar Disclaimer requirement for further
 *    binary redistribution.
 * 3. Neither the names of the above-listed copyright holders nor the names
 *    of any contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * Alternatively, this software may be distributed under the terms of the
 * GNU General Public License ("GPL") version 2 as published by the Free
 * Software Foundation.
 *
 * NO WARRANTY
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGES.
 */

#include <acpi/acpi.h>
#include <acpi/acparser.h>
#include <acpi/acinterp.h>
#include <acpi/acnamesp.h>

#define _COMPONENT          ACPI_NAMESPACE
ACPI_MODULE_NAME("nseval")

/* Local prototypes */
static acpi_status
acpi_ns_execute_control_method(struct acpi_parameter_info *info);

static acpi_status acpi_ns_get_object_value(struct acpi_parameter_info *info);

/*******************************************************************************
 *
 * FUNCTION:    acpi_ns_evaluate_relative
 *
 * PARAMETERS:  Pathname        - Name of method to execute, If NULL, the
 *                                handle is the object to execute
 *              Info            - Method info block, contains:
 *                  return_object   - Where to put method's return value (if
 *                                    any).  If NULL, no value is returned.
 *                  Params          - List of parameters to pass to the method,
 *                                    terminated by NULL.  Params itself may be
 *                                    NULL if no parameters are being passed.
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Evaluate the object or find and execute the requested method
 *
 * MUTEX:       Locks Namespace
 *
 ******************************************************************************/

acpi_status
acpi_ns_evaluate_relative(char *pathname, struct acpi_parameter_info *info)
{
	acpi_status status;
	struct acpi_namespace_node *node = NULL;
	union acpi_generic_state *scope_info;
	char *internal_path = NULL;

	ACPI_FUNCTION_TRACE("ns_evaluate_relative");

	/*
	 * Must have a valid object handle
	 */
	if (!info || !info->node) {
		return_ACPI_STATUS(AE_BAD_PARAMETER);
	}

	/* Build an internal name string for the method */

	status = acpi_ns_internalize_name(pathname, &internal_path);
	if (ACPI_FAILURE(status)) {
		return_ACPI_STATUS(status);
	}

	scope_info = acpi_ut_create_generic_state();
	if (!scope_info) {
		goto cleanup1;
	}

	/* Get the prefix handle and Node */

	status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
	if (ACPI_FAILURE(status)) {
		goto cleanup;
	}

	info->node = acpi_ns_map_handle_to_node(info->node);
	if (!info->node) {
		(void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
		status = AE_BAD_PARAMETER;
		goto cleanup;
	}

	/* Lookup the name in the namespace */

	scope_info->scope.node = info->node;
	status = acpi_ns_lookup(scope_info, internal_path, ACPI_TYPE_ANY,
				ACPI_IMODE_EXECUTE, ACPI_NS_NO_UPSEARCH, NULL,
				&node);

	(void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);

	if (ACPI_FAILURE(status)) {
		ACPI_DEBUG_PRINT((ACPI_DB_NAMES, "Object [%s] not found [%s]\n",
				  pathname, acpi_format_exception(status)));
		goto cleanup;
	}

	/*
	 * Now that we have a handle to the object, we can attempt to evaluate it.
	 */
	ACPI_DEBUG_PRINT((ACPI_DB_NAMES, "%s [%p] Value %p\n",
			  pathname, node, acpi_ns_get_attached_object(node)));

	info->node = node;
	status = acpi_ns_evaluate_by_handle(info);

	ACPI_DEBUG_PRINT((ACPI_DB_NAMES,
			  "*** Completed eval of object %s ***\n", pathname));

      cleanup:
	acpi_ut_delete_generic_state(scope_info);

      cleanup1:
	ACPI_MEM_FREE(internal_path);
	return_ACPI_STATUS(status);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ns_evaluate_by_name
 *
 * PARAMETERS:  Pathname        - Fully qualified pathname to the object
 *              Info                - Method info block, contains:
 *                  return_object   - Where to put method's return value (if
 *                                    any).  If NULL, no value is returned.
 *                  Params          - List of parameters to pass to the method,
 *                                    terminated by NULL.  Params itself may be
 *                                    NULL if no parameters are being passed.
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Evaluate the object or rind and execute the requested method
 *              passing the given parameters
 *
 * MUTEX:       Locks Namespace
 *
 ******************************************************************************/

acpi_status
acpi_ns_evaluate_by_name(char *pathname, struct acpi_parameter_info *info)
{
	acpi_status status;
	char *internal_path = NULL;

	ACPI_FUNCTION_TRACE("ns_evaluate_by_name");

	/* Build an internal name string for the method */

	status = acpi_ns_internalize_name(pathname, &internal_path);
	if (ACPI_FAILURE(status)) {
		return_ACPI_STATUS(status);
	}

	status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
	if (ACPI_FAILURE(status)) {
		goto cleanup;
	}

	/* Lookup the name in the namespace */

	status = acpi_ns_lookup(NULL, internal_path, ACPI_TYPE_ANY,
				ACPI_IMODE_EXECUTE, ACPI_NS_NO_UPSEARCH, NULL,
				&info->node);

	(void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);

	if (ACPI_FAILURE(status)) {
		ACPI_DEBUG_PRINT((ACPI_DB_NAMES,
				  "Object at [%s] was not found, status=%.4X\n",
				  pathname, status));
		goto cleanup;
	}

	/*
	 * Now that we have a handle to the object, we can attempt to evaluate it.
	 */
	ACPI_DEBUG_PRINT((ACPI_DB_NAMES, "%s [%p] Value %p\n",
			  pathname, info->node,
			  acpi_ns_get_attached_object(info->node)));

	status = acpi_ns_evaluate_by_handle(info);

	ACPI_DEBUG_PRINT((ACPI_DB_NAMES,
			  "*** Completed eval of object %s ***\n", pathname));

      cleanup:

	/* Cleanup */

	if (internal_path) {
		ACPI_MEM_FREE(internal_path);
	}

	return_ACPI_STATUS(status);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ns_evaluate_by_handle
 *
 * PARAMETERS:  Info            - Method info block, contains:
 *                  Node            - Method/Object Node to execute
 *                  Parameters      - List of parameters to pass to the method,
 *                                    terminated by NULL. Params itself may be
 *                                    NULL if no parameters are being passed.
 *                  return_object   - Where to put method's return value (if