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-rw-r--r--drivers/acpi/acpica/uteval.c315
1 files changed, 315 insertions, 0 deletions
diff --git a/drivers/acpi/acpica/uteval.c b/drivers/acpi/acpica/uteval.c
new file mode 100644
index 000000000..8180d1a45
--- /dev/null
+++ b/drivers/acpi/acpica/uteval.c
@@ -0,0 +1,315 @@
+// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
+/******************************************************************************
+ *
+ * Module Name: uteval - Object evaluation
+ *
+ * Copyright (C) 2000 - 2020, Intel Corp.
+ *
+ *****************************************************************************/
+
+#include <acpi/acpi.h>
+#include "accommon.h"
+#include "acnamesp.h"
+
+#define _COMPONENT ACPI_UTILITIES
+ACPI_MODULE_NAME("uteval")
+
+/*******************************************************************************
+ *
+ * FUNCTION: acpi_ut_evaluate_object
+ *
+ * PARAMETERS: prefix_node - Starting node
+ * path - Path to object from starting node
+ * expected_return_types - Bitmap of allowed return types
+ * return_desc - Where a return value is stored
+ *
+ * RETURN: Status
+ *
+ * DESCRIPTION: Evaluates a namespace object and verifies the type of the
+ * return object. Common code that simplifies accessing objects
+ * that have required return objects of fixed types.
+ *
+ * NOTE: Internal function, no parameter validation
+ *
+ ******************************************************************************/
+
+acpi_status
+acpi_ut_evaluate_object(struct acpi_namespace_node *prefix_node,
+ const char *path,
+ u32 expected_return_btypes,
+ union acpi_operand_object **return_desc)
+{
+ struct acpi_evaluate_info *info;
+ acpi_status status;
+ u32 return_btype;
+
+ ACPI_FUNCTION_TRACE(ut_evaluate_object);
+
+ /* Allocate the evaluation information block */
+
+ info = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_evaluate_info));
+ if (!info) {
+ return_ACPI_STATUS(AE_NO_MEMORY);
+ }
+
+ info->prefix_node = prefix_node;
+ info->relative_pathname = path;
+
+ /* Evaluate the object/method */
+
+ status = acpi_ns_evaluate(info);
+ if (ACPI_FAILURE(status)) {
+ if (status == AE_NOT_FOUND) {
+ ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
+ "[%4.4s.%s] was not found\n",
+ acpi_ut_get_node_name(prefix_node),
+ path));
+ } else {
+ ACPI_ERROR_METHOD("Method execution failed",
+ prefix_node, path, status);
+ }
+
+ goto cleanup;
+ }
+
+ /* Did we get a return object? */
+
+ if (!info->return_object) {
+ if (expected_return_btypes) {
+ ACPI_ERROR_METHOD("No object was returned from",
+ prefix_node, path, AE_NOT_EXIST);
+
+ status = AE_NOT_EXIST;
+ }
+
+ goto cleanup;
+ }
+
+ /* Map the return object type to the bitmapped type */
+
+ switch ((info->return_object)->common.type) {
+ case ACPI_TYPE_INTEGER:
+
+ return_btype = ACPI_BTYPE_INTEGER;
+ break;
+
+ case ACPI_TYPE_BUFFER:
+
+ return_btype = ACPI_BTYPE_BUFFER;
+ break;
+
+ case ACPI_TYPE_STRING:
+
+ return_btype = ACPI_BTYPE_STRING;
+ break;
+
+ case ACPI_TYPE_PACKAGE:
+
+ return_btype = ACPI_BTYPE_PACKAGE;
+ break;
+
+ default:
+
+ return_btype = 0;
+ break;
+ }
+
+ if ((acpi_gbl_enable_interpreter_slack) && (!expected_return_btypes)) {
+ /*
+ * We received a return object, but one was not expected. This can
+ * happen frequently if the "implicit return" feature is enabled.
+ * Just delete the return object and return AE_OK.
+ */
+ acpi_ut_remove_reference(info->return_object);
+ goto cleanup;
+ }
+
+ /* Is the return object one of the expected types? */
+
+ if (!(expected_return_btypes & return_btype)) {
+ ACPI_ERROR_METHOD("Return object type is incorrect",
+ prefix_node, path, AE_TYPE);
+
+ ACPI_ERROR((AE_INFO,
+ "Type returned from %s was incorrect: %s, expected Btypes: 0x%X",
+ path,
+ acpi_ut_get_object_type_name(info->return_object),
+ expected_return_btypes));
+
+ /* On error exit, we must delete the return object */
+
+ acpi_ut_remove_reference(info->return_object);
+ status = AE_TYPE;
+ goto cleanup;
+ }
+
+ /* Object type is OK, return it */
+
+ *return_desc = info->return_object;
+
+cleanup:
+ ACPI_FREE(info);
+ return_ACPI_STATUS(status);
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION: acpi_ut_evaluate_numeric_object
+ *
+ * PARAMETERS: object_name - Object name to be evaluated
+ * device_node - Node for the device
+ * value - Where the value is returned
+ *
+ * RETURN: Status
+ *
+ * DESCRIPTION: Evaluates a numeric namespace object for a selected device
+ * and stores result in *Value.
+ *
+ * NOTE: Internal function, no parameter validation
+ *
+ ******************************************************************************/
+
+acpi_status
+acpi_ut_evaluate_numeric_object(const char *object_name,
+ struct acpi_namespace_node *device_node,
+ u64 *value)
+{
+ union acpi_operand_object *obj_desc;
+ acpi_status status;
+
+ ACPI_FUNCTION_TRACE(ut_evaluate_numeric_object);
+
+ status = acpi_ut_evaluate_object(device_node, object_name,
+ ACPI_BTYPE_INTEGER, &obj_desc);
+ if (ACPI_FAILURE(status)) {
+ return_ACPI_STATUS(status);
+ }
+
+ /* Get the returned Integer */
+
+ *value = obj_desc->integer.value;
+
+ /* On exit, we must delete the return object */
+
+ acpi_ut_remove_reference(obj_desc);
+ return_ACPI_STATUS(status);
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION: acpi_ut_execute_STA
+ *
+ * PARAMETERS: device_node - Node for the device
+ * flags - Where the status flags are returned
+ *
+ * RETURN: Status
+ *
+ * DESCRIPTION: Executes _STA for selected device and stores results in
+ * *Flags. If _STA does not exist, then the device is assumed
+ * to be present/functional/enabled (as per the ACPI spec).
+ *
+ * NOTE: Internal function, no parameter validation
+ *
+ ******************************************************************************/
+
+acpi_status
+acpi_ut_execute_STA(struct acpi_namespace_node *device_node, u32 * flags)
+{
+ union acpi_operand_object *obj_desc;
+ acpi_status status;
+
+ ACPI_FUNCTION_TRACE(ut_execute_STA);
+
+ status = acpi_ut_evaluate_object(device_node, METHOD_NAME__STA,
+ ACPI_BTYPE_INTEGER, &obj_desc);
+ if (ACPI_FAILURE(status)) {
+ if (AE_NOT_FOUND == status) {
+ /*
+ * if _STA does not exist, then (as per the ACPI specification),
+ * the returned flags will indicate that the device is present,
+ * functional, and enabled.
+ */
+ ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
+ "_STA on %4.4s was not found, assuming device is present\n",
+ acpi_ut_get_node_name(device_node)));
+
+ *flags = ACPI_UINT32_MAX;
+ status = AE_OK;
+ }
+
+ return_ACPI_STATUS(status);
+ }
+
+ /* Extract the status flags */
+
+ *flags = (u32) obj_desc->integer.value;
+
+ /* On exit, we must delete the return object */
+
+ acpi_ut_remove_reference(obj_desc);
+ return_ACPI_STATUS(status);
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION: acpi_ut_execute_power_methods
+ *
+ * PARAMETERS: device_node - Node for the device
+ * method_names - Array of power method names
+ * method_count - Number of methods to execute
+ * out_values - Where the power method values are returned
+ *
+ * RETURN: Status, out_values
+ *
+ * DESCRIPTION: Executes the specified power methods for the device and returns
+ * the result(s).
+ *
+ * NOTE: Internal function, no parameter validation
+ *
+******************************************************************************/
+
+acpi_status
+acpi_ut_execute_power_methods(struct acpi_namespace_node *device_node,
+ const char **method_names,
+ u8 method_count, u8 *out_values)
+{
+ union acpi_operand_object *obj_desc;
+ acpi_status status;
+ acpi_status final_status = AE_NOT_FOUND;
+ u32 i;
+
+ ACPI_FUNCTION_TRACE(ut_execute_power_methods);
+
+ for (i = 0; i < method_count; i++) {
+ /*
+ * Execute the power method (_sx_d or _sx_w). The only allowable
+ * return type is an Integer.
+ */
+ status = acpi_ut_evaluate_object(device_node,
+ ACPI_CAST_PTR(char,
+ method_names[i]),
+ ACPI_BTYPE_INTEGER, &obj_desc);
+ if (ACPI_SUCCESS(status)) {
+ out_values[i] = (u8)obj_desc->integer.value;
+
+ /* Delete the return object */
+
+ acpi_ut_remove_reference(obj_desc);
+ final_status = AE_OK; /* At least one value is valid */
+ continue;
+ }
+
+ out_values[i] = ACPI_UINT8_MAX;
+ if (status == AE_NOT_FOUND) {
+ continue; /* Ignore if not found */
+ }
+
+ ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
+ "Failed %s on Device %4.4s, %s\n",
+ ACPI_CAST_PTR(char, method_names[i]),
+ acpi_ut_get_node_name(device_node),
+ acpi_format_exception(status)));
+ }
+
+ return_ACPI_STATUS(final_status);
+}
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