/* Local prototypes */ staticvoid acpi_ns_resolve_references(struct acpi_evaluate_info *info);
/******************************************************************************* * * FUNCTION: acpi_evaluate_object_typed * * PARAMETERS: handle - Object handle (optional) * pathname - Object pathname (optional) * external_params - List of parameters to pass to a method, * terminated by NULL. May be NULL * if no parameters are being passed. * return_buffer - Where to put the object'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) *
******************************************************************************/
if (!return_buffer) {
return_ACPI_STATUS(AE_BAD_PARAMETER);
}
if (return_buffer->length == ACPI_ALLOCATE_BUFFER) {
free_buffer_on_error = TRUE;
}
/* Get a handle here, in order to build an error message if needed */
target_handle = handle; if (pathname) {
status = acpi_get_handle(handle, pathname, &target_handle); if (ACPI_FAILURE(status)) {
return_ACPI_STATUS(status);
}
}
full_pathname = acpi_ns_get_external_pathname(target_handle); if (!full_pathname) {
return_ACPI_STATUS(AE_NO_MEMORY);
}
/* Evaluate the object */
status = acpi_evaluate_object(target_handle, NULL, external_params,
return_buffer); if (ACPI_FAILURE(status)) { gotoexit;
}
/* Type ANY means "don't care about return value type" */
if (return_type == ACPI_TYPE_ANY) { gotoexit;
}
if (return_buffer->length == 0) {
/* Error because caller specifically asked for a return value */
ACPI_ERROR((AE_INFO, "%s did not return any object",
full_pathname));
status = AE_NULL_OBJECT; gotoexit;
}
/* Examine the object type returned from evaluate_object */
if (((union acpi_object *)return_buffer->pointer)->type == return_type) { gotoexit;
}
/* Return object type does not match requested type */
ACPI_ERROR((AE_INFO, "Incorrect return type from %s - received [%s], requested [%s]",
full_pathname,
acpi_ut_get_type_name(((union acpi_object *)return_buffer->
pointer)->type),
acpi_ut_get_type_name(return_type)));
if (free_buffer_on_error) { /* * Free a buffer created via ACPI_ALLOCATE_BUFFER. * Note: We use acpi_os_free here because acpi_os_allocate was used * to allocate the buffer. This purposefully bypasses the * (optionally enabled) allocation tracking mechanism since we * only want to track internal allocations.
*/
acpi_os_free(return_buffer->pointer);
return_buffer->pointer = NULL;
}
/******************************************************************************* * * 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);
}
/* Convert and validate the device handle */
info->prefix_node = acpi_ns_validate_handle(handle); if (!info->prefix_node) {
status = AE_BAD_PARAMETER; goto cleanup;
}
/* * Get the actual namespace node for the target object. * Handles these cases: * * 1) Null node, valid pathname from root (absolute path) * 2) Node and valid pathname (path relative to Node) * 3) Node, Null pathname
*/ if ((pathname) && (ACPI_IS_ROOT_PREFIX(pathname[0]))) {
/* The path is fully qualified, just evaluate by name */
info->prefix_node = NULL;
} elseif (!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; goto cleanup;
}
info->relative_pathname = pathname;
/* * Convert all external objects passed as arguments to the * internal version(s).
*/ if (external_params && external_params->count) {
info->param_count = (u16)external_params->count;
/* Warn on impossible argument count */
if (info->param_count > ACPI_METHOD_NUM_ARGS) {
ACPI_WARN_PREDEFINED((AE_INFO, pathname,
ACPI_WARN_ALWAYS, "Excess arguments (%u) - using only %u",
info->param_count,
ACPI_METHOD_NUM_ARGS));
info->param_count = ACPI_METHOD_NUM_ARGS;
}
/* * 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)info->
param_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 < info->param_count; i++) {
status =
acpi_ut_copy_eobject_to_iobject(&external_params->
pointer[i],
&info->
parameters[i]); if (ACPI_FAILURE(status)) { goto cleanup;
}
}
info->parameters[info->param_count] = NULL;
}
#ifdef _FUTURE_FEATURE
/* * Begin incoming argument count analysis. Check for too few args * and too many args.
*/ switch (acpi_ns_get_type(info->node)) { case ACPI_TYPE_METHOD:
/* Check incoming argument count against the method definition */
if (info->obj_desc->method.param_count > info->param_count) {
ACPI_ERROR((AE_INFO, "Insufficient arguments (%u) - %u are required",
info->param_count,
info->obj_desc->method.param_count));
status = AE_MISSING_ARGUMENTS; goto cleanup;
}
elseif (info->obj_desc->method.param_count < info->param_count) {
ACPI_WARNING((AE_INFO, "Excess arguments (%u) - only %u are required",
info->param_count,
info->obj_desc->method.param_count));
/* * Any incoming external objects to be passed as arguments to the * method must be converted to internal objects
*/ if (info->param_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)
info->
param_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 < info->param_count; i++) {
status =
acpi_ut_copy_eobject_to_iobject
(&external_params->pointer[i],
&info->parameters[i]); if (ACPI_FAILURE(status)) { goto cleanup;
}
}
/* Warn if arguments passed to an object that is not a method */
if (info->param_count) {
ACPI_WARNING((AE_INFO, "%u arguments were passed to a non-method ACPI object",
info->param_count));
} break;
}
#endif
/* Now we can evaluate the object */
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) { goto cleanup_return_object;
}
if (!info->return_object) {
return_buffer->length = 0; goto cleanup;
}
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_FAILURE(status)) { goto cleanup_return_object;
}
/* 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);
}
}
cleanup_return_object:
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) */
/******************************************************************************* * * 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. *
******************************************************************************/ staticvoid 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 ((info->return_object)->common.type != 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 a union acpi_object, so it is not dereferenced here. A ddb_handle * (AML_LOAD_OP) cannot be dereferenced, nor can it be converted to * a union acpi_object.
*/ switch (info->return_object->reference.class) { case ACPI_REFCLASS_INDEX:
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 * descending_callback - Called during tree descent * when an object of "Type" is found * ascending_callback - Called during tree ascent * when an object of "Type" is found * context - Passed to user function(s) above * 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 callback function is called whenever an object that matches * the type parameter is found. If the callback 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 callback function(s) can be * tailored to each task, whether it is a print function, * a compare function, etc. *
******************************************************************************/
/* * Need to acquire the namespace reader lock to prevent interference * with any concurrent table unloads (which causes the deletion of * namespace objects). We cannot allow the deletion of a namespace node * while the user function is using it. The exception to this are the * nodes created and deleted during control method execution -- these * nodes are marked as temporary nodes and are ignored by the namespace * walk. Thus, control methods can be executed while holding the * namespace deletion lock (and the user function can execute control * methods.)
*/
status = acpi_ut_acquire_read_lock(&acpi_gbl_namespace_rw_lock); if (ACPI_FAILURE(status)) {
return_ACPI_STATUS(status);
}
/* * Lock the namespace around the walk. The namespace will be * unlocked/locked around each call to the user function - since the user * function must be allowed to make ACPICA calls itself (for example, it * will typically execute control methods during device enumeration.)
*/
status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE); if (ACPI_FAILURE(status)) { goto unlock_and_exit;
}
/* Now we can validate the starting node */
if (!acpi_ns_validate_handle(start_object)) {
status = AE_BAD_PARAMETER; goto unlock_and_exit2;
}
status = acpi_ns_walk_namespace(type, start_object, max_depth,
ACPI_NS_WALK_UNLOCK,
descending_callback, ascending_callback,
context, return_value);
/******************************************************************************* * * FUNCTION: acpi_ns_get_device_callback * * PARAMETERS: Callback from acpi_get_device * * RETURN: Status * * DESCRIPTION: Takes callbacks from walk_namespace and filters out all non- * present devices, or if they specified a HID, it filters based * on that. *
******************************************************************************/ static acpi_status
acpi_ns_get_device_callback(acpi_handle obj_handle,
u32 nesting_level, void *context, void **return_value)
{ struct acpi_get_devices_info *info = context;
acpi_status status; struct acpi_namespace_node *node;
u32 flags; struct acpi_pnp_device_id *hid; struct acpi_pnp_device_id_list *cid;
u32 i;
u8 found; int no_match;
status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE); if (ACPI_FAILURE(status)) { return (status);
}
node = acpi_ns_validate_handle(obj_handle);
status = acpi_ut_release_mutex(ACPI_MTX_NAMESPACE); if (ACPI_FAILURE(status)) { return (status);
}
if (!node) { return (AE_BAD_PARAMETER);
}
/* * First, filter based on the device HID and CID. * * 01/2010: For this case where a specific HID is requested, we don't * want to run _STA until we have an actual HID match. Thus, we will * not unnecessarily execute _STA on devices for which the caller * doesn't care about. Previously, _STA was executed unconditionally * on all devices found here. * * A side-effect of this change is that now we will continue to search * for a matching HID even under device trees where the parent device * would have returned a _STA that indicates it is not present or * not functioning (thus aborting the search on that branch).
*/ if (info->hid != NULL) {
status = acpi_ut_execute_HID(node, &hid); if (status == AE_NOT_FOUND) { return (AE_OK);
} elseif (ACPI_FAILURE(status)) { return (AE_CTRL_DEPTH);
}
if (no_match) { /* * HID does not match, attempt match within the * list of Compatible IDs (CIDs)
*/
status = acpi_ut_execute_CID(node, &cid); if (status == AE_NOT_FOUND) { return (AE_OK);
} elseif (ACPI_FAILURE(status)) { return (AE_CTRL_DEPTH);
}
/* Walk the CID list */
found = FALSE; for (i = 0; i < cid->count; i++) { if (strcmp(cid->ids[i].string, info->hid) == 0) {
/* Found a matching CID */
found = TRUE; break;
}
}
ACPI_FREE(cid); if (!found) { return (AE_OK);
}
}
}
/* Run _STA to determine if device is present */
status = acpi_ut_execute_STA(node, &flags); if (ACPI_FAILURE(status)) { return (AE_CTRL_DEPTH);
}
if (!(flags & ACPI_STA_DEVICE_PRESENT) &&
!(flags & ACPI_STA_DEVICE_FUNCTIONING)) { /* * Don't examine the children of the device only when the * device is neither present nor functional. See ACPI spec, * description of _STA for more information.
*/ return (AE_CTRL_DEPTH);
}
/* We have a valid device, invoke the user function */
status = info->user_function(obj_handle, nesting_level,
info->context, return_value); return (status);
}
/******************************************************************************* * * FUNCTION: acpi_get_devices * * PARAMETERS: HID - HID to search for. Can be NULL. * user_function - Called when a matching object is found * context - Passed to user function * return_value - Location where return value of * user_function is put if terminated early * * RETURNS Return value from the user_function if terminated early. * Otherwise, returns NULL. * * DESCRIPTION: Performs a modified depth-first walk of the namespace tree, * starting (and ending) at the object specified by start_handle. * The user_function is called whenever an object of type * Device is found. If the user function returns * a non-zero value, the search is terminated immediately and this * value is returned to the caller. * * This is a wrapper for walk_namespace, but the callback performs * additional filtering. Please see acpi_ns_get_device_callback. *
******************************************************************************/
if (!user_function) {
return_ACPI_STATUS(AE_BAD_PARAMETER);
}
/* * We're going to call their callback from OUR callback, so we need * to know what it is, and their context parameter.
*/
info.hid = HID;
info.context = context;
info.user_function = user_function;
/* * Lock the namespace around the walk. * The namespace will be unlocked/locked around each call * to the user function - since this function * must be allowed to make Acpi calls itself.
*/
status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE); if (ACPI_FAILURE(status)) {
return_ACPI_STATUS(status);
}
status = acpi_ns_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
ACPI_UINT32_MAX, ACPI_NS_WALK_UNLOCK,
acpi_ns_get_device_callback, NULL,
&info, return_value);
/******************************************************************************* * * FUNCTION: acpi_attach_data * * PARAMETERS: obj_handle - Namespace node * handler - Handler for this attachment * data - Pointer to data to be attached * * RETURN: Status * * DESCRIPTION: Attach arbitrary data and handler to a namespace node. *
******************************************************************************/
acpi_status
acpi_attach_data(acpi_handle obj_handle,
acpi_object_handler handler, void *data)
{ struct acpi_namespace_node *node;
acpi_status status;
/* Parameter validation */
if (!obj_handle || !handler || !data) { return (AE_BAD_PARAMETER);
}
status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE); if (ACPI_FAILURE(status)) { return (status);
}
/* Convert and validate the handle */
node = acpi_ns_validate_handle(obj_handle); if (!node) {
status = AE_BAD_PARAMETER; goto unlock_and_exit;
}
status = acpi_ns_attach_data(node, handler, data);
/******************************************************************************* * * FUNCTION: acpi_get_data_full * * PARAMETERS: obj_handle - Namespace node * handler - Handler used in call to attach_data * data - Where the data is returned * callback - function to execute before returning * * RETURN: Status * * DESCRIPTION: Retrieve data that was previously attached to a namespace node * and execute a callback before returning. *
******************************************************************************/
acpi_status
acpi_get_data_full(acpi_handle obj_handle, acpi_object_handler handler, void **data, void (*callback)(void *))
{ struct acpi_namespace_node *node;
acpi_status status;
/* Parameter validation */
if (!obj_handle || !handler || !data) { return (AE_BAD_PARAMETER);
}
status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE); if (ACPI_FAILURE(status)) { return (status);
}
/* Convert and validate the handle */
node = acpi_ns_validate_handle(obj_handle); if (!node) {
status = AE_BAD_PARAMETER; goto unlock_and_exit;
}
status = acpi_ns_get_attached_data(node, handler, data); if (ACPI_SUCCESS(status) && callback) {
callback(*data);
}
/******************************************************************************* * * FUNCTION: acpi_get_data * * PARAMETERS: obj_handle - Namespace node * handler - Handler used in call to attach_data * data - Where the data is returned * * RETURN: Status * * DESCRIPTION: Retrieve data that was previously attached to a namespace node. *
******************************************************************************/
acpi_status
acpi_get_data(acpi_handle obj_handle, acpi_object_handler handler, void **data)
{ return acpi_get_data_full(obj_handle, handler, data, NULL);
}
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