/******************************************************************************* * * Module Name: nsxfeval - Public interfaces to the ACPI subsystem * ACPI Object evaluation interfaces * $Revision: 4 $ * ******************************************************************************/ /* * Copyright (C) 2000 - 2002, R. Byron Moore * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ #include "acpi.h" #include "acnamesp.h" #define _COMPONENT ACPI_NAMESPACE ACPI_MODULE_NAME ("nsxfeval") /******************************************************************************* * * 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, acpi_object_list *external_params, 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_DEBUG_PRINT ((ACPI_DB_ERROR, "No return value\n")); return_ACPI_STATUS (AE_NULL_OBJECT); } /* Examine the object type returned from Evaluate_object */ if (((acpi_object *) return_buffer->pointer)->type == return_type) { return_ACPI_STATUS (AE_OK); } /* Return object type does not match requested type */ ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Incorrect return type [%s] requested [%s]\n", acpi_ut_get_type_name (((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_os_free (return_buffer->pointer); return_buffer->pointer = NULL; } return_buffer->length = 0; return_ACPI_STATUS (AE_TYPE); } /******************************************************************************* * * 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, acpi_object_list *external_params, acpi_buffer *return_buffer) { acpi_status status; acpi_operand_object **internal_params = NULL; acpi_operand_object *internal_return_obj = NULL; ACPI_SIZE buffer_space_needed; u32 i; ACPI_FUNCTION_TRACE ("Acpi_evaluate_object"); /* * If there are parameters to be passed to the object * (which must be a control method), the external objects * must 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 */ internal_params = ACPI_MEM_CALLOCATE (((ACPI_SIZE) external_params->count + 1) * sizeof (void *)); if (!internal_params) { return_ACPI_STATUS (AE_NO_MEMORY); } /* * 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], &internal_params[i]); if (ACPI_FAILURE (status)) { acpi_ut_delete_internal_object_list (internal_params); return_ACPI_STATUS (status); } } internal_params[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 */ status = acpi_ns_evaluate_by_name (pathname, internal_params, &internal_return_obj); } 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_ERROR, "Both Handle and Pathname are NULL\n")); } else { ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Handle is NULL and Pathname is relative\n")); } status = AE_BAD_PARAMETER; } else { /* * We get here if we have a handle -- and if we have a * pathname it is relative. The handle will be validated * in the lower procedures */ if (!pathname) { /* * The null pathname case means the handle is for * the actual object to be evaluated */ status = acpi_ns_evaluate_by_handle (handle, internal_params, &internal_return_obj); } else { /* * Both a Handle and a relative Pathname */ status = acpi_ns_evaluate_relative (handle, pathname, internal_params, &internal_return_obj); } } /* * If we are expecting a return value, and all went well above, * copy the return value to an external object. */ if (return_buffer) { if (!internal_return_obj) { return_buffer->length = 0; } else { if (ACPI_GET_DESCRIPTOR_TYPE (internal_return_obj) == 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; internal_return_obj = NULL; /* No need to delete a NS Node */ return_buffer->length = 0; } if (ACPI_SUCCESS (status)) { /* * Find out how large a buffer is needed * to contain the returned object */ status = acpi_ut_get_object_size (internal_return_obj, &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 (internal_return_obj, return_buffer); } } } } } /* Delete the return and parameter objects */ if (internal_return_obj) { /* * Delete the internal return object. (Or at least * decrement the reference count by one) */ acpi_ut_remove_reference (internal_return_obj); } /* * Free the input parameter list (if we created one), */ if (internal_params) { /* Free the allocated parameter block */ acpi_ut_delete_internal_object_list (internal_params); } return_ACPI_STATUS (status); } /******************************************************************************* * * 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_EXTERNAL_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); } /******************************************************************************* * * 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) { acpi_status status; acpi_namespace_node *node; u32 flags; acpi_device_id hid; acpi_device_id cid; acpi_get_devices_info *info; info = context; 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 & 0x01)) { /* Don't return at the device or children of the device if not there */ 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.buffer, info->hid, sizeof (hid.buffer)) != 0) { status = acpi_ut_execute_CID (node, &cid); if (status == AE_NOT_FOUND) { return (AE_OK); } else if (ACPI_FAILURE (status)) { return (AE_CTRL_DEPTH); } /* TBD: Handle CID packages */ if (ACPI_STRNCMP (cid.buffer, info->hid, sizeof (cid.buffer)) != 0) { 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 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. * * This is a wrapper for Walk_namespace, but the callback performs * additional filtering. Please see Acpi_get_device_callback. * ******************************************************************************/ acpi_status acpi_get_devices ( NATIVE_CHAR *HID, acpi_walk_callback user_function, void *context, void **return_value) { acpi_status status; 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); } /******************************************************************************* * * 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) { 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) { 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) { 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); }