ACPI 5.0: New interface, acpi_get_event_resources

Executes _AEI and formats the result, similar to acpi_get_current_resources, etc.

Signed-off-by: Bob Moore <robert.moore@intel.com>
Signed-off-by: Lin Ming <ming.m.lin@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>

4 files changed, 98 insertions, 0 deletions

diff --git a/drivers/acpi/acpica/acresrc.h b/drivers/acpi/acpica/acresrc.h
index 05721b023f88..61b2e049d8d6 100644
--- a/drivers/acpi/acpica/acresrc.h
+++ b/drivers/acpi/acpica/acresrc.h
@@ -215,6 +215,10 @@ acpi_status
 acpi_rs_set_srs_method_data(struct acpi_namespace_node *node,
                             struct acpi_buffer *ret_buffer);
 
+acpi_status
+acpi_rs_get_aei_method_data(struct acpi_namespace_node *node,
+                            struct acpi_buffer *ret_buffer);
+
 /*
  * rscalc
  */
diff --git a/drivers/acpi/acpica/rsutils.c b/drivers/acpi/acpica/rsutils.c
index 4409db8209d7..54a9a974b624 100644
--- a/drivers/acpi/acpica/rsutils.c
+++ b/drivers/acpi/acpica/rsutils.c
@@ -594,6 +594,56 @@ acpi_rs_get_prs_method_data(struct acpi_namespace_node *node,
 
 /*******************************************************************************
  *
+ * FUNCTION:    acpi_rs_get_aei_method_data
+ *
+ * PARAMETERS:  Node            - Device node
+ *              ret_buffer      - Pointer to a buffer structure for the
+ *                                results
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: This function is called to get the _AEI value of an object
+ *              contained in an object specified by the handle passed in
+ *
+ *              If the function fails an appropriate status will be returned
+ *              and the contents of the callers buffer is undefined.
+ *
+ ******************************************************************************/
+
+acpi_status
+acpi_rs_get_aei_method_data(struct acpi_namespace_node *node,
+                            struct acpi_buffer *ret_buffer)
+{
+        union acpi_operand_object *obj_desc;
+        acpi_status status;
+
+        ACPI_FUNCTION_TRACE(rs_get_aei_method_data);
+
+        /* Parameters guaranteed valid by caller */
+
+        /* Execute the method, no parameters */
+
+        status = acpi_ut_evaluate_object(node, METHOD_NAME__AEI,
+                                         ACPI_BTYPE_BUFFER, &obj_desc);
+        if (ACPI_FAILURE(status)) {
+                return_ACPI_STATUS(status);
+        }
+
+        /*
+         * Make the call to create a resource linked list from the
+         * byte stream buffer that comes back from the _CRS method
+         * execution.
+         */
+        status = acpi_rs_create_resource_list(obj_desc, ret_buffer);
+
+        /* On exit, we must delete the object returned by evaluate_object */
+
+        acpi_ut_remove_reference(obj_desc);
+        return_ACPI_STATUS(status);
+}
+
+/*******************************************************************************
+ *
  * FUNCTION:    acpi_rs_get_method_data
  *
  * PARAMETERS:  Handle          - Handle to the containing object
diff --git a/drivers/acpi/acpica/rsxface.c b/drivers/acpi/acpica/rsxface.c
index fe86b37b16ce..45a9e5e4e4db 100644
--- a/drivers/acpi/acpica/rsxface.c
+++ b/drivers/acpi/acpica/rsxface.c
@@ -307,6 +307,46 @@ acpi_set_current_resources(acpi_handle device_handle,
 
 ACPI_EXPORT_SYMBOL(acpi_set_current_resources)
 
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_get_event_resources
+ *
+ * PARAMETERS:  device_handle   - Handle to the device object for the
+ *                                device we are getting resources
+ *              in_buffer       - Pointer to a buffer containing the
+ *                                resources to be set for the device
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: This function is called to get the event resources for a
+ *              specific device. The caller must first acquire a handle for
+ *              the desired device. The resource data is passed to the routine
+ *              the buffer pointed to by the in_buffer variable. Uses the
+ *              _AEI method.
+ *
+ ******************************************************************************/
+acpi_status
+acpi_get_event_resources(acpi_handle device_handle,
+                         struct acpi_buffer *ret_buffer)
+{
+        acpi_status status;
+        struct acpi_namespace_node *node;
+
+        ACPI_FUNCTION_TRACE(acpi_get_event_resources);
+
+        /* Validate parameters then dispatch to internal routine */
+
+        status = acpi_rs_validate_parameters(device_handle, ret_buffer, &node);
+        if (ACPI_FAILURE(status)) {
+                return_ACPI_STATUS(status);
+        }
+
+        status = acpi_rs_get_aei_method_data(node, ret_buffer);
+        return_ACPI_STATUS(status);
+}
+
+ACPI_EXPORT_SYMBOL(acpi_get_event_resources)
+
 /******************************************************************************
  *
  * FUNCTION:    acpi_resource_to_address64
diff --git a/include/acpi/acpixf.h b/include/acpi/acpixf.h
index dd86610039b3..726d937ef5b1 100644
--- a/include/acpi/acpixf.h
+++ b/include/acpi/acpixf.h
@@ -358,6 +358,10 @@ acpi_get_possible_resources(acpi_handle device, struct acpi_buffer *ret_buffer);
 #endif
 
 acpi_status
+acpi_get_event_resources(acpi_handle device_handle,
+                         struct acpi_buffer *ret_buffer);
+
+acpi_status
 acpi_walk_resources(acpi_handle device,
                     char *name,
                     acpi_walk_resource_callback user_function, void *context);