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982 lines
28 KiB
982 lines
28 KiB
// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0 |
|
/******************************************************************************* |
|
* |
|
* Module Name: nsxfeval - Public interfaces to the ACPI subsystem |
|
* ACPI Object evaluation interfaces |
|
* |
|
******************************************************************************/ |
|
|
|
#define EXPORT_ACPI_INTERFACES |
|
|
|
#include <acpi/acpi.h> |
|
#include "accommon.h" |
|
#include "acnamesp.h" |
|
#include "acinterp.h" |
|
|
|
#define _COMPONENT ACPI_NAMESPACE |
|
ACPI_MODULE_NAME("nsxfeval") |
|
|
|
/* Local prototypes */ |
|
static void 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) |
|
* |
|
******************************************************************************/ |
|
|
|
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 free_buffer_on_error = FALSE; |
|
acpi_handle target_handle; |
|
char *full_pathname; |
|
|
|
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) { |
|
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)) { |
|
goto exit; |
|
} |
|
|
|
/* Type ANY means "don't care about return value type" */ |
|
|
|
if (return_type == ACPI_TYPE_ANY) { |
|
goto exit; |
|
} |
|
|
|
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; |
|
goto exit; |
|
} |
|
|
|
/* Examine the object type returned from evaluate_object */ |
|
|
|
if (((union acpi_object *)return_buffer->pointer)->type == return_type) { |
|
goto exit; |
|
} |
|
|
|
/* Return object type does not match requested type */ |
|
|
|
ACPI_ERROR((AE_INFO, |
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"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; |
|
} |
|
|
|
return_buffer->length = 0; |
|
status = AE_TYPE; |
|
|
|
exit: |
|
ACPI_FREE(full_pathname); |
|
return_ACPI_STATUS(status); |
|
} |
|
|
|
ACPI_EXPORT_SYMBOL(acpi_evaluate_object_typed) |
|
|
|
/******************************************************************************* |
|
* |
|
* 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; |
|
} 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; |
|
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; |
|
} |
|
|
|
else if (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)); |
|
|
|
/* Just pass the required number of arguments */ |
|
|
|
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 = |
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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; |
|
} |
|
break; |
|
|
|
default: |
|
|
|
/* 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) */ |
|
|
|
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 ((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: |
|
|
|
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 |
|
* 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. |
|
* |
|
******************************************************************************/ |
|
|
|
acpi_status |
|
acpi_walk_namespace(acpi_object_type type, |
|
acpi_handle start_object, |
|
u32 max_depth, |
|
acpi_walk_callback descending_callback, |
|
acpi_walk_callback ascending_callback, |
|
void *context, void **return_value) |
|
{ |
|
acpi_status status; |
|
|
|
ACPI_FUNCTION_TRACE(acpi_walk_namespace); |
|
|
|
/* Parameter validation */ |
|
|
|
if ((type > ACPI_TYPE_LOCAL_MAX) || |
|
(!max_depth) || (!descending_callback && !ascending_callback)) { |
|
return_ACPI_STATUS(AE_BAD_PARAMETER); |
|
} |
|
|
|
/* |
|
* 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); |
|
|
|
unlock_and_exit2: |
|
(void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE); |
|
|
|
unlock_and_exit: |
|
(void)acpi_ut_release_read_lock(&acpi_gbl_namespace_rw_lock); |
|
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 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); |
|
} else if (ACPI_FAILURE(status)) { |
|
return (AE_CTRL_DEPTH); |
|
} |
|
|
|
no_match = strcmp(hid->string, info->hid); |
|
ACPI_FREE(hid); |
|
|
|
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); |
|
} else if (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. |
|
* |
|
******************************************************************************/ |
|
|
|
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, NULL, |
|
&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_validate_handle(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_validate_handle(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_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); |
|
} |
|
|
|
unlock_and_exit: |
|
(void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE); |
|
return (status); |
|
} |
|
|
|
ACPI_EXPORT_SYMBOL(acpi_get_data_full) |
|
|
|
/******************************************************************************* |
|
* |
|
* 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); |
|
} |
|
|
|
ACPI_EXPORT_SYMBOL(acpi_get_data)
|
|
|