ipa: Define serialized controls

Define data structures to be used during interaction between IPA modules
and pipeline handlers to serialize control lists and control info maps.

Signed-off-by: Jacopo Mondi <jacopo@jmondi.org>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>

include/ipa/ipa_controls.h

@@ -0,0 +1,54 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+/*
+ * Copyright (C) 2019, Google Inc.
+ *
+ * ipa_controls.h - IPA Control handling
+ */
+#ifndef __LIBCAMERA_IPA_CONTROLS_H__
+#define __LIBCAMERA_IPA_CONTROLS_H__
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#define IPA_CONTROLS_FORMAT_VERSION	1
+
+struct ipa_controls_header {
+	uint32_t version;
+	uint32_t handle;
+	uint32_t entries;
+	uint32_t size;
+	uint32_t data_offset;
+	uint32_t reserved[3];
+};
+
+struct ipa_control_value_entry {
+	uint32_t id;
+	uint32_t type;
+	uint32_t count;
+	uint32_t offset;
+};
+
+struct ipa_control_range_entry {
+	uint32_t id;
+	uint32_t type;
+	uint32_t offset;
+	uint32_t padding[1];
+};
+
+union ipa_control_value_data {
+	bool b;
+	int32_t i32;
+	int64_t i64;
+};
+
+struct ipa_control_range_data {
+	union ipa_control_value_data min;
+	union ipa_control_value_data max;
+};
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* __LIBCAMERA_IPA_CONTROLS_H__ */

include/ipa/meson.build

@@ -1,4 +1,5 @@
 libcamera_ipa_api = files([
+    'ipa_controls.h',
     'ipa_interface.h',
     'ipa_module_info.h',
 ])