libcamera: controls: Introduce control-related data types

Add a set of data types to support controls:

- ControlValue stores a control type and value in a generic way
- ControlId enumerates all the control identifiers
- ControlIdentifier declares the types of a control and map their names
- ControlInfo stores runtime information for controls
- ControlList contains a set of control info and value pairs

The control definitions map is generated from the controls documentation
to ensure that the two will always be synchronised.

Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>

1 files changed, 11 insertions, 0 deletions

diff --git a/src/libcamera/meson.build b/src/libcamera/meson.build
index 45bd9d17..8075b1f6 100644
--- a/src/libcamera/meson.build
+++ b/src/libcamera/meson.build
@@ -3,6 +3,7 @@ libcamera_sources = files([
     'camera.cpp',
     'camera_manager.cpp',
     'camera_sensor.cpp',
+    'controls.cpp',
     'device_enumerator.cpp',
     'device_enumerator_sysfs.cpp',
     'event_dispatcher.cpp',
@@ -68,6 +69,16 @@ if libudev.found()
     ])
 endif
 
+gen_controls = files('gen-controls.awk')
+
+control_types_cpp = custom_target('control_types_cpp',
+                                  input : files('controls.cpp'),
+                                  output : 'control_types.cpp',
+                                  depend_files : gen_controls,
+                                  command : [gen_controls, '@INPUT@', '--code', '@OUTPUT@'])
+
+libcamera_sources += control_types_cpp
+
 libcamera_deps = [
     cc.find_library('dl'),
     libudev,