kernel-ark/drivers/acpi/namespace/nsxfeval.c

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/*******************************************************************************
*
* Module Name: nsxfeval - Public interfaces to the ACPI subsystem
* ACPI Object evaluation interfaces
*
******************************************************************************/
/*
* Copyright (C) 2000 - 2005, 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)
ACPICA 20050408 from Bob Moore Fixed three cases in the interpreter where an "index" argument to an ASL function was still (internally) 32 bits instead of the required 64 bits. This was the Index argument to the Index, Mid, and Match operators. The "strupr" function is now permanently local (acpi_ut_strupr), since this is not a POSIX-defined function and not present in most kernel-level C libraries. References to the C library strupr function have been removed from the headers. Completed the deployment of static functions/prototypes. All prototypes with the static attribute have been moved from the headers to the owning C file. ACPICA 20050329 from Bob Moore An error is now generated if an attempt is made to create a Buffer Field of length zero (A CreateField with a length operand of zero.) The interpreter now issues a warning whenever executable code at the module level is detected during ACPI table load. This will give some idea of the prevalence of this type of code. Implemented support for references to named objects (other than control methods) within package objects. Enhanced package object output for the debug object. Package objects are now completely dumped, showing all elements. Enhanced miscellaneous object output for the debug object. Any object can now be written to the debug object (for example, a device object can be written, and the type of the object will be displayed.) The "static" qualifier has been added to all local functions across the core subsystem. The number of "long" lines (> 80 chars) within the source has been significantly reduced, by about 1/3. Cleaned up all header files to ensure that all CA/iASL functions are prototyped (even static functions) and the formatting is consistent. Two new header files have been added, acopcode.h and acnames.h. Removed several obsolete functions that were no longer used. Signed-off-by: Len Brown <len.brown@intel.com>
2005-04-19 02:49:35 +00:00
* 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.
ACPICA 20050408 from Bob Moore Fixed three cases in the interpreter where an "index" argument to an ASL function was still (internally) 32 bits instead of the required 64 bits. This was the Index argument to the Index, Mid, and Match operators. The "strupr" function is now permanently local (acpi_ut_strupr), since this is not a POSIX-defined function and not present in most kernel-level C libraries. References to the C library strupr function have been removed from the headers. Completed the deployment of static functions/prototypes. All prototypes with the static attribute have been moved from the headers to the owning C file. ACPICA 20050329 from Bob Moore An error is now generated if an attempt is made to create a Buffer Field of length zero (A CreateField with a length operand of zero.) The interpreter now issues a warning whenever executable code at the module level is detected during ACPI table load. This will give some idea of the prevalence of this type of code. Implemented support for references to named objects (other than control methods) within package objects. Enhanced package object output for the debug object. Package objects are now completely dumped, showing all elements. Enhanced miscellaneous object output for the debug object. Any object can now be written to the debug object (for example, a device object can be written, and the type of the object will be displayed.) The "static" qualifier has been added to all local functions across the core subsystem. The number of "long" lines (> 80 chars) within the source has been significantly reduced, by about 1/3. Cleaned up all header files to ensure that all CA/iASL functions are prototyped (even static functions) and the formatting is consistent. Two new header files have been added, acopcode.h and acnames.h. Removed several obsolete functions that were no longer used. Signed-off-by: Len Brown <len.brown@intel.com>
2005-04-19 02:49:35 +00:00
* 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_DEBUG_PRINT((ACPI_DB_ERROR, "No return value\n"));
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_DEBUG_PRINT((ACPI_DB_ERROR,
"Incorrect return type [%s] requested [%s]\n",
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_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(&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_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);
}
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 & 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.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);
}