Add function to walk through children.

Without losing my sanity that is.
ACPI API refactoring will happen some day.

headers/os/drivers/ACPI.h

@@ -236,6 +236,8 @@ struct acpi_module_info {
 
 	status_t	(*get_next_entry)(uint32 objectType, const char *base,
 					char *result, size_t length, void **_counter);
+	status_t	(*get_next_object)(uint32 objectType, acpi_handle parent,
+					acpi_handle* currentChild);
 	status_t	(*get_device)(const char *hid, uint32 index, char *result,
 					size_t resultLength);
 

src/add-ons/kernel/bus_managers/acpi/ACPIPrivate.h

@@ -202,6 +202,8 @@ status_t remove_fixed_event_handler(uint32 event, acpi_event_handler handler);
 
 status_t get_next_entry(uint32 object_type, const char* base, char* result,
 	size_t length, void** _counter);
+status_t get_next_object(uint32 object_type, acpi_handle parent,
+	acpi_handle* currentChild);
 status_t get_device(const char* hid, uint32 index, char* result,
 	size_t resultLength);
 

src/add-ons/kernel/bus_managers/acpi/BusManager.cpp

@@ -505,6 +505,16 @@ get_next_entry(uint32 objectType, const char *base, char *result,
 }
 
 
+status_t
+get_next_object(uint32 objectType, acpi_handle parent,
+	acpi_handle* currentChild)
+{
+	acpi_handle child = *currentChild;
+	return AcpiGetNextObject(objectType, parent, child, currentChild) == AE_OK ?
+		B_OK : B_ERROR;
+}
+
+
 status_t
 get_device(const char* hid, uint32 index, char* result, size_t resultLength)
 {
@@ -829,6 +839,7 @@ struct acpi_module_info gACPIModule = {
 	install_fixed_event_handler,
 	remove_fixed_event_handler,
 	get_next_entry,
+	get_next_object,
 	get_device,
 	get_device_hid,
 	get_object_type,