libcamera: V4L2Control: remove V4L2Control classes

V4L2ControlId and V4L2ControlInfo are just convenience classes to
create ControlId and ControlInfo from v4l2_query_ext_control.
Therefore, there is no need of being a class. It is used only
from V4L2Device. This removes the classes and put the equivalent
functions of creating ControlId and ControlInfo in
v4l2_device.cpp.

Signed-off-by: Hirokazu Honda <hiroh@chromium.org>
Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

3 files changed, 70 insertions, 156 deletions

diff --git a/src/libcamera/meson.build b/src/libcamera/meson.build
index 7bc59b84..5a41816e 100644
--- a/src/libcamera/meson.build
+++ b/src/libcamera/meson.build
@@ -52,7 +52,6 @@ libcamera_sources = files([
     'timer.cpp',
     'transform.cpp',
     'utils.cpp',
-    'v4l2_controls.cpp',
     'v4l2_device.cpp',
     'v4l2_pixelformat.cpp',
     'v4l2_subdevice.cpp',
diff --git a/src/libcamera/v4l2_controls.cpp b/src/libcamera/v4l2_controls.cpp
deleted file mode 100644
index 3f8ec6ca..00000000
--- a/src/libcamera/v4l2_controls.cpp
+++ /dev/null
@@ -1,151 +0,0 @@
-/* SPDX-License-Identifier: LGPL-2.1-or-later */
-/*
- * Copyright (C) 2019, Google Inc.
- *
- * v4l2_controls.cpp - V4L2 Controls Support
- */
-
-#include "libcamera/internal/v4l2_controls.h"
-
-#include <string.h>
-
-/**
- * \file v4l2_controls.h
- * \brief Support for V4L2 Controls using the V4L2 Extended Controls APIs
- *
- * The V4L2 Control API allows application to inspect and modify sets of
- * configurable parameters on a video device or subdevice. The nature of the
- * parameters an application can modify using the control framework depends on
- * what the driver implements support for, and on the characteristics of the
- * underlying hardware platform. Generally controls are used to modify user
- * visible settings, such as the image brightness and exposure time, or
- * non-standard parameters which cannot be controlled through the V4L2 format
- * negotiation API.
- *
- * Controls are identified by a numerical ID, defined by the V4L2 kernel headers
- * and have an associated type. Each control has a value, which is the data that
- * can be modified with V4L2Device::setControls() or retrieved with
- * V4L2Device::getControls().
- *
- * The control's type along with the control's flags define the type of the
- * control's value content. Controls can transport a single data value stored in
- * variable inside the control, or they might as well deal with more complex
- * data types, such as arrays of matrices, stored in a contiguous memory
- * locations associated with the control and called 'the payload'. Such controls
- * are called 'compound controls' and are currently not supported by the
- * libcamera V4L2 control framework.
- *
- * libcamera implements support for controls using the V4L2 Extended Control
- * API, which allows future handling of controls with payloads of arbitrary
- * sizes.
- *
- * The libcamera V4L2 Controls framework operates on lists of controls, wrapped
- * by the ControlList class, to match the V4L2 extended controls API. The
- * interface to set and get control is implemented by the V4L2Device class, and
- * this file only provides the data type definitions.
- *
- * \todo Add support for compound controls
- */
-
-namespace libcamera {
-
-namespace {
-
-std::string v4l2_ctrl_name(const struct v4l2_query_ext_ctrl &ctrl)
-{
-	size_t len = strnlen(ctrl.name, sizeof(ctrl.name));
-	return std::string(static_cast<const char *>(ctrl.name), len);
-}
-
-ControlType v4l2_ctrl_type(const struct v4l2_query_ext_ctrl &ctrl)
-{
-	switch (ctrl.type) {
-	case V4L2_CTRL_TYPE_U8:
-		return ControlTypeByte;
-
-	case V4L2_CTRL_TYPE_BOOLEAN:
-		return ControlTypeBool;
-
-	case V4L2_CTRL_TYPE_INTEGER:
-		return ControlTypeInteger32;
-
-	case V4L2_CTRL_TYPE_INTEGER64:
-		return ControlTypeInteger64;
-
-	case V4L2_CTRL_TYPE_MENU:
-	case V4L2_CTRL_TYPE_BUTTON:
-	case V4L2_CTRL_TYPE_BITMASK:
-	case V4L2_CTRL_TYPE_INTEGER_MENU:
-		/*
-		 * More precise types may be needed, for now use a 32-bit
-		 * integer type.
-		 */
-		return ControlTypeInteger32;
-
-	default:
-		return ControlTypeNone;
-	}
-}
-
-} /* namespace */
-
-/**
- * \class V4L2ControlId
- * \brief V4L2 control static metadata
- *
- * The V4L2ControlId class is a specialisation of the ControlId for V4L2
- * controls.
- */
-
-/**
- * \brief Construct a V4L2ControlId from a struct v4l2_query_ext_ctrl
- * \param[in] ctrl The struct v4l2_query_ext_ctrl as returned by the kernel
- */
-V4L2ControlId::V4L2ControlId(const struct v4l2_query_ext_ctrl &ctrl)
-	: ControlId(ctrl.id, v4l2_ctrl_name(ctrl), v4l2_ctrl_type(ctrl))
-{
-}
-
-/**
- * \class V4L2ControlInfo
- * \brief Convenience specialisation of ControlInfo for V4L2 controls
- *
- * The V4L2ControlInfo class is a specialisation of the ControlInfo for V4L2
- * controls. It offers a convenience constructor from a struct
- * v4l2_query_ext_ctrl, and is otherwise equivalent to the ControlInfo class.
- */
-
-/**
- * \brief Construct a V4L2ControlInfo from a struct v4l2_query_ext_ctrl
- * \param[in] ctrl The struct v4l2_query_ext_ctrl as returned by the kernel
- */
-V4L2ControlInfo::V4L2ControlInfo(const struct v4l2_query_ext_ctrl &ctrl)
-{
-	switch (ctrl.type) {
-	case V4L2_CTRL_TYPE_U8:
-		ControlInfo::operator=(ControlInfo(static_cast<uint8_t>(ctrl.minimum),
-						   static_cast<uint8_t>(ctrl.maximum),
-						   static_cast<uint8_t>(ctrl.default_value)));
-		break;
-
-	case V4L2_CTRL_TYPE_BOOLEAN:
-		ControlInfo::operator=(ControlInfo(static_cast<bool>(ctrl.minimum),
-						   static_cast<bool>(ctrl.maximum),
-						   static_cast<bool>(ctrl.default_value)));
-		break;
-
-	case V4L2_CTRL_TYPE_INTEGER64:
-		ControlInfo::operator=(ControlInfo(static_cast<int64_t>(ctrl.minimum),
-						   static_cast<int64_t>(ctrl.maximum),
-						   static_cast<int64_t>(ctrl.default_value)));
-		break;
-
-	default:
-		ControlInfo::operator=(ControlInfo(static_cast<int32_t>(ctrl.minimum),
-						   static_cast<int32_t>(ctrl.maximum),
-						   static_cast<int32_t>(ctrl.default_value)));
-		break;
-	}
-}
-
-} /* namespace libcamera */
diff --git a/src/libcamera/v4l2_device.cpp b/src/libcamera/v4l2_device.cpp
index 515cbdfe..caafbc2d 100644
--- a/src/libcamera/v4l2_device.cpp
+++ b/src/libcamera/v4l2_device.cpp
@@ -20,7 +20,6 @@
 #include "libcamera/internal/log.h"
 #include "libcamera/internal/sysfs.h"
 #include "libcamera/internal/utils.h"
-#include "libcamera/internal/v4l2_controls.h"
 
 /**
  * \file v4l2_device.h
@@ -31,6 +30,73 @@ namespace libcamera {
 
 LOG_DEFINE_CATEGORY(V4L2)
 
+namespace {
+
+ControlType v4l2CtrlType(uint32_t ctrlType)
+{
+	switch (ctrlType) {
+	case V4L2_CTRL_TYPE_U8:
+		return ControlTypeByte;
+
+	case V4L2_CTRL_TYPE_BOOLEAN:
+		return ControlTypeBool;
+
+	case V4L2_CTRL_TYPE_INTEGER:
+		return ControlTypeInteger32;
+
+	case V4L2_CTRL_TYPE_INTEGER64:
+		return ControlTypeInteger64;
+
+	case V4L2_CTRL_TYPE_MENU:
+	case V4L2_CTRL_TYPE_BUTTON:
+	case V4L2_CTRL_TYPE_BITMASK:
+	case V4L2_CTRL_TYPE_INTEGER_MENU:
+		/*
+		 * More precise types may be needed, for now use a 32-bit
+		 * integer type.
+		 */
+		return ControlTypeInteger32;
+
+	default:
+		return ControlTypeNone;
+	}
+}
+
+std::unique_ptr<ControlId> v4l2ControlId(const v4l2_query_ext_ctrl &ctrl)
+{
+	const size_t len = strnlen(ctrl.name, sizeof(ctrl.name));
+	const std::string name(static_cast<const char *>(ctrl.name), len);
+	const ControlType type = v4l2CtrlType(ctrl.type);
+
+	return std::make_unique<ControlId>(ctrl.id, name, type);
+}
+
+ControlInfo v4l2ControlInfo(const v4l2_query_ext_ctrl &ctrl)
+{
+	switch (ctrl.type) {
+	case V4L2_CTRL_TYPE_U8:
+		return ControlInfo(static_cast<uint8_t>(ctrl.minimum),
+				   static_cast<uint8_t>(ctrl.maximum),
+				   static_cast<uint8_t>(ctrl.default_value));
+
+	case V4L2_CTRL_TYPE_BOOLEAN:
+		return ControlInfo(static_cast<bool>(ctrl.minimum),
+				   static_cast<bool>(ctrl.maximum),
+				   static_cast<bool>(ctrl.default_value));
+
+	case V4L2_CTRL_TYPE_INTEGER64:
+		return ControlInfo(static_cast<int64_t>(ctrl.minimum),
+				   static_cast<int64_t>(ctrl.maximum),
+				   static_cast<int64_t>(ctrl.default_value));
+
+	default:
+		return ControlInfo(static_cast<int32_t>(ctrl.minimum),
+				   static_cast<int32_t>(ctrl.maximum),
+				   static_cast<int32_t>(ctrl.default_value));
+	}
+}
+} /* namespace */
+
 /**
  * \class V4L2Device
  * \brief Base class for V4L2VideoDevice and V4L2Subdevice
@@ -502,10 +568,10 @@ void V4L2Device::listControls()
 			continue;
 		}
 
-		controlIds_.emplace_back(std::make_unique<V4L2ControlId>(ctrl));
+		controlIds_.emplace_back(v4l2ControlId(ctrl));
 		controlInfo_.emplace(ctrl.id, ctrl);
 
-		ctrls.emplace(controlIds_.back().get(), V4L2ControlInfo(ctrl));
+		ctrls.emplace(controlIds_.back().get(), v4l2ControlInfo(ctrl));
 	}
 
 	controls_ = std::move(ctrls);
@@ -544,7 +610,7 @@ void V4L2Device::updateControlInfo()
 			continue;
 		}
 
-		info = V4L2ControlInfo(ctrl);
+		info = v4l2ControlInfo(ctrl);
 	}
 }