/******************************************************************************* * * Module Name: nsxfeval - Public interfaces to the ACPI subsystem * ACPI Object evaluation interfaces * ******************************************************************************/ /* * Copyright (C) 2000 - 2006, 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 <linux/module.h> #include <acpi/acpi.h> #include <acpi/acnamesp.h> #include <acpi/acinterp.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) * ******************************************************************************/ #ifdef ACPI_FUTURE_USAGE 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_os_free(return_buffer->pointer); return_buffer->pointer = NULL; } return_buffer->length = 0; return_ACPI_STATUS(AE_TYPE); } #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; acpi_status status2; struct acpi_parameter_info info; acpi_size buffer_space_needed; u32 i; ACPI_FUNCTION_TRACE("acpi_evaluate_object"); info.node = handle; info.parameters = NULL; info.return_object = NULL; info.parameter_type = ACPI_PARAM_ARGS; /* * 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 */ info.parameters = ACPI_MEM_CALLOCATE(((acpi_size) external_params->count + 1) * sizeof(void *)); if (!info.parameters) { 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], &info. parameters[i]); if (ACPI_FAILURE(status)) { acpi_ut_delete_internal_object_list(info. parameters); return_ACPI_STATUS(status); } } 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 */ status = acpi_ns_evaluate_by_name(pathname, &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_ERROR((AE_INFO, "Both Handle and Pathname are NULL")); } else { ACPI_ERROR((AE_INFO, "Handle is NULL and Pathname is relative")); } 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(&info); } else { /* * Both a Handle and a relative Pathname */ status = acpi_ns_evaluate_relative(pathname, &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)) { /* * Find out how large a buffer is needed * to contain 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. */ status2 = acpi_ex_enter_interpreter(); if (ACPI_SUCCESS(status2)) { /* * Delete the internal return object. (Or at least * decrement the reference count by one) */ acpi_ut_remove_reference(info.return_object); acpi_ex_exit_interpreter(); } } /* * 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); } return_ACPI_STATUS(status); } EXPORT_SYMBOL(acpi_evaluate_object); /******************************************************************************* * * 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); } 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 acpi_device_id hid; struct acpi_compatible_id_list *cid; acpi_native_uint i; 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)) { /* Don't examine children of the device if not present */ 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 */ for (i = 0; i < cid->count; i++) { if (ACPI_STRNCMP(cid->id[i].value, info->hid, sizeof(struct acpi_compatible_id)) != 0) { ACPI_MEM_FREE(cid); return (AE_OK); } } ACPI_MEM_FREE(cid); } } 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_get_device_callback. * ******************************************************************************/ acpi_status acpi_get_devices(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.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); } 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); } /******************************************************************************* * * 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); } /******************************************************************************* * * 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); }