| /******************************************************************************* |
| * |
| * Module Name: nsxfeval - Public interfaces to the ACPI subsystem |
| * ACPI Object evaluation interfaces |
| * |
| ******************************************************************************/ |
| |
| /* |
| * Copyright (C) 2000 - 2008, Intel Corp. |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions, and the following disclaimer, |
| * without modification. |
| * 2. Redistributions in binary form must reproduce at minimum a disclaimer |
| * substantially similar to the "NO WARRANTY" disclaimer below |
| * ("Disclaimer") and any redistribution must be conditioned upon |
| * including a substantially similar Disclaimer requirement for further |
| * binary redistribution. |
| * 3. Neither the names of the above-listed copyright holders nor the names |
| * of any contributors may be used to endorse or promote products derived |
| * from this software without specific prior written permission. |
| * |
| * Alternatively, this software may be distributed under the terms of the |
| * GNU General Public License ("GPL") version 2 as published by the Free |
| * Software Foundation. |
| * |
| * NO WARRANTY |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR |
| * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, |
| * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING |
| * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
| * POSSIBILITY OF SUCH DAMAGES. |
| */ |
| |
| #include <acpi/acpi.h> |
| #include <acpi/accommon.h> |
| #include <acpi/acnamesp.h> |
| #include <acpi/acinterp.h> |
| |
| #define _COMPONENT ACPI_NAMESPACE |
| ACPI_MODULE_NAME("nsxfeval") |
| |
| /* Local prototypes */ |
| static void acpi_ns_resolve_references(struct acpi_evaluate_info *info); |
| |
| #ifdef ACPI_FUTURE_USAGE |
| /******************************************************************************* |
| * |
| * FUNCTION: acpi_evaluate_object_typed |
| * |
| * PARAMETERS: Handle - Object handle (optional) |
| * Pathname - Object pathname (optional) |
| * external_params - List of parameters to pass to method, |
| * terminated by NULL. May be NULL |
| * if no parameters are being passed. |
| * return_buffer - Where to put method's return value (if |
| * any). If NULL, no value is returned. |
| * return_type - Expected type of return object |
| * |
| * RETURN: Status |
| * |
| * DESCRIPTION: Find and evaluate the given object, passing the given |
| * parameters if necessary. One of "Handle" or "Pathname" must |
| * be valid (non-null) |
| * |
| ******************************************************************************/ |
| |
| acpi_status |
| acpi_evaluate_object_typed(acpi_handle handle, |
| acpi_string pathname, |
| struct acpi_object_list *external_params, |
| struct acpi_buffer *return_buffer, |
| acpi_object_type return_type) |
| { |
| acpi_status status; |
| u8 must_free = FALSE; |
| |
| ACPI_FUNCTION_TRACE(acpi_evaluate_object_typed); |
| |
| /* Return buffer must be valid */ |
| |
| if (!return_buffer) { |
| return_ACPI_STATUS(AE_BAD_PARAMETER); |
| } |
| |
| if (return_buffer->length == ACPI_ALLOCATE_BUFFER) { |
| must_free = TRUE; |
| } |
| |
| /* Evaluate the object */ |
| |
| status = |
| acpi_evaluate_object(handle, pathname, external_params, |
| return_buffer); |
| if (ACPI_FAILURE(status)) { |
| return_ACPI_STATUS(status); |
| } |
| |
| /* Type ANY means "don't care" */ |
| |
| if (return_type == ACPI_TYPE_ANY) { |
| return_ACPI_STATUS(AE_OK); |
| } |
| |
| if (return_buffer->length == 0) { |
| |
| /* Error because caller specifically asked for a return value */ |
| |
| ACPI_ERROR((AE_INFO, "No return value")); |
| return_ACPI_STATUS(AE_NULL_OBJECT); |
| } |
| |
| /* Examine the object type returned from evaluate_object */ |
| |
| if (((union acpi_object *)return_buffer->pointer)->type == return_type) { |
| return_ACPI_STATUS(AE_OK); |
| } |
| |
| /* Return object type does not match requested type */ |
| |
| ACPI_ERROR((AE_INFO, |
| "Incorrect return type [%s] requested [%s]", |
| acpi_ut_get_type_name(((union acpi_object *)return_buffer-> |
| pointer)->type), |
| acpi_ut_get_type_name(return_type))); |
| |
| if (must_free) { |
| |
| /* Caller used ACPI_ALLOCATE_BUFFER, free the return buffer */ |
| |
| ACPI_FREE(return_buffer->pointer); |
| return_buffer->pointer = NULL; |
| } |
| |
| return_buffer->length = 0; |
| return_ACPI_STATUS(AE_TYPE); |
| } |
| |
| ACPI_EXPORT_SYMBOL(acpi_evaluate_object_typed) |
| #endif /* ACPI_FUTURE_USAGE */ |
| /******************************************************************************* |
| * |
| * FUNCTION: acpi_evaluate_object |
| * |
| * PARAMETERS: Handle - Object handle (optional) |
| * Pathname - Object pathname (optional) |
| * external_params - List of parameters to pass to method, |
| * terminated by NULL. May be NULL |
| * if no parameters are being passed. |
| * return_buffer - Where to put method's return value (if |
| * any). If NULL, no value is returned. |
| * |
| * RETURN: Status |
| * |
| * DESCRIPTION: Find and evaluate the given object, passing the given |
| * parameters if necessary. One of "Handle" or "Pathname" must |
| * be valid (non-null) |
| * |
| ******************************************************************************/ |
| acpi_status |
| acpi_evaluate_object(acpi_handle handle, |
| acpi_string pathname, |
| struct acpi_object_list *external_params, |
| struct acpi_buffer *return_buffer) |
| { |
| acpi_status status; |
| struct acpi_evaluate_info *info; |
| acpi_size buffer_space_needed; |
| u32 i; |
| |
| ACPI_FUNCTION_TRACE(acpi_evaluate_object); |
| |
| /* Allocate and initialize the evaluation information block */ |
| |
| info = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_evaluate_info)); |
| if (!info) { |
| return_ACPI_STATUS(AE_NO_MEMORY); |
| } |
| |
| info->pathname = pathname; |
| |
| /* Convert and validate the device handle */ |
| |
| info->prefix_node = acpi_ns_map_handle_to_node(handle); |
| if (!info->prefix_node) { |
| status = AE_BAD_PARAMETER; |
| goto cleanup; |
| } |
| |
| /* |
| * If there are parameters to be passed to a control method, the external |
| * objects must all be converted to internal objects |
| */ |
| if (external_params && external_params->count) { |
| /* |
| * Allocate a new parameter block for the internal objects |
| * Add 1 to count to allow for null terminated internal list |
| */ |
| info->parameters = ACPI_ALLOCATE_ZEROED(((acpi_size) |
| external_params-> |
| count + |
| 1) * sizeof(void *)); |
| if (!info->parameters) { |
| status = AE_NO_MEMORY; |
| goto cleanup; |
| } |
| |
| /* Convert each external object in the list to an internal object */ |
| |
| for (i = 0; i < external_params->count; i++) { |
| status = |
| acpi_ut_copy_eobject_to_iobject(&external_params-> |
| pointer[i], |
| &info-> |
| parameters[i]); |
| if (ACPI_FAILURE(status)) { |
| goto cleanup; |
| } |
| } |
| info->parameters[external_params->count] = NULL; |
| } |
| |
| /* |
| * Three major cases: |
| * 1) Fully qualified pathname |
| * 2) No handle, not fully qualified pathname (error) |
| * 3) Valid handle |
| */ |
| if ((pathname) && (acpi_ns_valid_root_prefix(pathname[0]))) { |
| |
| /* The path is fully qualified, just evaluate by name */ |
| |
| info->prefix_node = NULL; |
| status = acpi_ns_evaluate(info); |
| } else if (!handle) { |
| /* |
| * A handle is optional iff a fully qualified pathname is specified. |
| * Since we've already handled fully qualified names above, this is |
| * an error |
| */ |
| if (!pathname) { |
| ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
| "Both Handle and Pathname are NULL")); |
| } else { |
| ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
| "Null Handle with relative pathname [%s]", |
| pathname)); |
| } |
| |
| status = AE_BAD_PARAMETER; |
| } else { |
| /* We have a namespace a node and a possible relative path */ |
| |
| status = acpi_ns_evaluate(info); |
| } |
| |
| /* |
| * If we are expecting a return value, and all went well above, |
| * copy the return value to an external object. |
| */ |
| if (return_buffer) { |
| if (!info->return_object) { |
| return_buffer->length = 0; |
| } else { |
| if (ACPI_GET_DESCRIPTOR_TYPE(info->return_object) == |
| ACPI_DESC_TYPE_NAMED) { |
| /* |
| * If we received a NS Node as a return object, this means that |
| * the object we are evaluating has nothing interesting to |
| * return (such as a mutex, etc.) We return an error because |
| * these types are essentially unsupported by this interface. |
| * We don't check up front because this makes it easier to add |
| * support for various types at a later date if necessary. |
| */ |
| status = AE_TYPE; |
| info->return_object = NULL; /* No need to delete a NS Node */ |
| return_buffer->length = 0; |
| } |
| |
| if (ACPI_SUCCESS(status)) { |
| |
| /* Dereference Index and ref_of references */ |
| |
| acpi_ns_resolve_references(info); |
| |
| /* Get the size of the returned object */ |
| |
| status = |
| acpi_ut_get_object_size(info->return_object, |
| &buffer_space_needed); |
| if (ACPI_SUCCESS(status)) { |
| |
| /* Validate/Allocate/Clear caller buffer */ |
| |
| status = |
| acpi_ut_initialize_buffer |
| (return_buffer, |
| buffer_space_needed); |
| if (ACPI_FAILURE(status)) { |
| /* |
| * Caller's buffer is too small or a new one can't |
| * be allocated |
| */ |
| ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
| "Needed buffer size %X, %s\n", |
| (u32) |
| buffer_space_needed, |
| acpi_format_exception |
| (status))); |
| } else { |
| /* We have enough space for the object, build it */ |
| |
| status = |
| acpi_ut_copy_iobject_to_eobject |
| (info->return_object, |
| return_buffer); |
| } |
| } |
| } |
| } |
| } |
| |
| if (info->return_object) { |
| /* |
| * Delete the internal return object. NOTE: Interpreter must be |
| * locked to avoid race condition. |
| */ |
| acpi_ex_enter_interpreter(); |
| |
| /* Remove one reference on the return object (should delete it) */ |
| |
| acpi_ut_remove_reference(info->return_object); |
| acpi_ex_exit_interpreter(); |
| } |
| |
| cleanup: |
| |
| /* Free the input parameter list (if we created one) */ |
| |
| if (info->parameters) { |
| |
| /* Free the allocated parameter block */ |
| |
| acpi_ut_delete_internal_object_list(info->parameters); |
| } |
| |
| ACPI_FREE(info); |
| return_ACPI_STATUS(status); |
| } |
| |
| ACPI_EXPORT_SYMBOL(acpi_evaluate_object) |
| |
| /******************************************************************************* |
| * |
| * FUNCTION: acpi_ns_resolve_references |
| * |
| * PARAMETERS: Info - Evaluation info block |
| * |
| * RETURN: Info->return_object is replaced with the dereferenced object |
| * |
| * DESCRIPTION: Dereference certain reference objects. Called before an |
| * internal return object is converted to an external union acpi_object. |
| * |
| * Performs an automatic dereference of Index and ref_of reference objects. |
| * These reference objects are not supported by the union acpi_object, so this is a |
| * last resort effort to return something useful. Also, provides compatibility |
| * with other ACPI implementations. |
| * |
| * NOTE: does not handle references within returned package objects or nested |
| * references, but this support could be added later if found to be necessary. |
| * |
| ******************************************************************************/ |
| static void acpi_ns_resolve_references(struct acpi_evaluate_info *info) |
| { |
| union acpi_operand_object *obj_desc = NULL; |
| struct acpi_namespace_node *node; |
| |
| /* We are interested in reference objects only */ |
| |
| if (ACPI_GET_OBJECT_TYPE(info->return_object) != |
| ACPI_TYPE_LOCAL_REFERENCE) { |
| return; |
| } |
| |
| /* |
| * Two types of references are supported - those created by Index and |
| * ref_of operators. A name reference (AML_NAMEPATH_OP) can be converted |
| * to an union acpi_object, so it is not dereferenced here. A ddb_handle |
| * (AML_LOAD_OP) cannot be dereferenced, nor can it be converted to |
| * an union acpi_object. |
| */ |
| switch (info->return_object->reference.class) { |
| case ACPI_REFCLASS_INDEX: |
| |
| obj_desc = *(info->return_object->reference.where); |
| break; |
| |
| case ACPI_REFCLASS_REFOF: |
| |
| node = info->return_object->reference.object; |
| if (node) { |
| obj_desc = node->object; |
| } |
| break; |
| |
| default: |
| return; |
| } |
| |
| /* Replace the existing reference object */ |
| |
| if (obj_desc) { |
| acpi_ut_add_reference(obj_desc); |
| acpi_ut_remove_reference(info->return_object); |
| info->return_object = obj_desc; |
| } |
| |
| return; |
| } |
| |
| /******************************************************************************* |
| * |
| * FUNCTION: acpi_walk_namespace |
| * |
| * PARAMETERS: Type - acpi_object_type to search for |
| * start_object - Handle in namespace where search begins |
| * max_depth - Depth to which search is to reach |
| * user_function - Called when an object of "Type" 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 that matches |
| * the type parameter is found. If the user function returns |
| * a non-zero value, the search is terminated immediately and this |
| * value is returned to the caller. |
| * |
| * 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 User Function 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 user_function, |
| void *context, void **return_value) |
| { |
| acpi_status status; |
| |
| ACPI_FUNCTION_TRACE(acpi_walk_namespace); |
| |
| /* Parameter validation */ |
| |
| if ((type > ACPI_TYPE_LOCAL_MAX) || (!max_depth) || (!user_function)) { |
| return_ACPI_STATUS(AE_BAD_PARAMETER); |
| } |
| |
| /* |
| * 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(type, start_object, max_depth, |
| ACPI_NS_WALK_UNLOCK, |
| user_function, context, return_value); |
| |
| (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE); |
| 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 acpica_device_id hid; |
| struct acpi_compatible_id_list *cid; |
| u32 i; |
| int found; |
| |
| status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE); |
| if (ACPI_FAILURE(status)) { |
| return (status); |
| } |
| |
| node = acpi_ns_map_handle_to_node(obj_handle); |
| status = acpi_ut_release_mutex(ACPI_MTX_NAMESPACE); |
| if (ACPI_FAILURE(status)) { |
| return (status); |
| } |
| |
| if (!node) { |
| return (AE_BAD_PARAMETER); |
| } |
| |
| /* 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); |
| } |
| |
| /* Filter based on device HID & CID */ |
| |
| 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); |
| } |
| |
| if (ACPI_STRNCMP(hid.value, info->hid, sizeof(hid.value)) != 0) { |
| |
| /* Get the list of Compatible IDs */ |
| |
| 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 = 0; |
| for (i = 0; i < cid->count; i++) { |
| if (ACPI_STRNCMP(cid->id[i].value, info->hid, |
| sizeof(struct |
| acpi_compatible_id)) == |
| 0) { |
| found = 1; |
| break; |
| } |
| } |
| ACPI_FREE(cid); |
| if (!found) |
| return (AE_OK); |
| } |
| } |
| |
| 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, &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_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); |
| } |
| |
| 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_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); |
| } |
| |
| ACPI_EXPORT_SYMBOL(acpi_detach_data) |
| |
| /******************************************************************************* |
| * |
| * 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); |
| } |
| |
| ACPI_EXPORT_SYMBOL(acpi_get_data) |