diff options
Diffstat (limited to 'drivers/acpi/namespace/nsxfeval.c')
| -rw-r--r-- | drivers/acpi/namespace/nsxfeval.c | 811 |
1 files changed, 811 insertions, 0 deletions
diff --git a/drivers/acpi/namespace/nsxfeval.c b/drivers/acpi/namespace/nsxfeval.c new file mode 100644 index 0000000..a085cc3 --- /dev/null +++ b/drivers/acpi/namespace/nsxfeval.c @@ -0,0 +1,811 @@ +/******************************************************************************* + * + * 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/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) |
