[PATCH v2 1/2] libcamera: Allow enumerating u32 control type

[Harvey Yang]

From: Yudhistira Erlandinata <yerlandinata at chromium.org>

Only allowing V4L2_CTRL_TYPE_U32 control type to be listed in the
V4L2Device::controls_, so it can be used together with function
V4L2Device::setExtControl. Like many other control types, this type
is still not supported in the V4L2Device::getControls and
V4L2Device::setControls.

Signed-off-by: Yudhistira Erlandinata <yerlandinata at chromium.org>
Co-developed-by: Harvey Yang <chenghaoyang at chromium.org>
Signed-off-by: Harvey Yang <chenghaoyang at chromium.org>
---
 include/libcamera/controls.h  |  7 +++++++
 src/libcamera/controls.cpp    | 12 ++++++++++--
 src/libcamera/v4l2_device.cpp | 13 +++++++++++++
 3 files changed, 30 insertions(+), 2 deletions(-)

diff --git a/include/libcamera/controls.h b/include/libcamera/controls.h
index ca60bbaca..6da8ad2c3 100644
--- a/include/libcamera/controls.h
+++ b/include/libcamera/controls.h
@@ -29,6 +29,7 @@ enum ControlType {
 	ControlTypeNone,
 	ControlTypeBool,
 	ControlTypeByte,
+	ControlTypeUnsigned32,
 	ControlTypeInteger32,
 	ControlTypeInteger64,
 	ControlTypeFloat,
@@ -62,6 +63,12 @@ struct control_type<uint8_t> {
 	static constexpr std::size_t size = 0;
 };
 
+template<>
+struct control_type<uint32_t> {
+	static constexpr ControlType value = ControlTypeUnsigned32;
+	static constexpr std::size_t size = 0;
+};
+
 template<>
 struct control_type<int32_t> {
 	static constexpr ControlType value = ControlTypeInteger32;
diff --git a/src/libcamera/controls.cpp b/src/libcamera/controls.cpp
index 62185d643..8ae295191 100644
--- a/src/libcamera/controls.cpp
+++ b/src/libcamera/controls.cpp
@@ -54,6 +54,7 @@ static constexpr size_t ControlValueSize[] = {
 	[ControlTypeNone]		= 0,
 	[ControlTypeBool]		= sizeof(bool),
 	[ControlTypeByte]		= sizeof(uint8_t),
+	[ControlTypeUnsigned32]		= sizeof(uint32_t),
 	[ControlTypeInteger32]		= sizeof(int32_t),
 	[ControlTypeInteger64]		= sizeof(int64_t),
 	[ControlTypeFloat]		= sizeof(float),
@@ -74,10 +75,12 @@ static constexpr size_t ControlValueSize[] = {
  * The control stores a boolean value
  * \var ControlTypeByte
  * The control stores a byte value as an unsigned 8-bit integer
+ * \var ControlTypeUnsigned32
+ * The control stores an unsigned 32-bit integer value
  * \var ControlTypeInteger32
- * The control stores a 32-bit integer value
+ * The control stores a signed 32-bit integer value
  * \var ControlTypeInteger64
- * The control stores a 64-bit integer value
+ * The control stores a signed 64-bit integer value
  * \var ControlTypeFloat
  * The control stores a 32-bit floating point value
  * \var ControlTypeString
@@ -230,6 +233,11 @@ std::string ControlValue::toString() const
 			str += std::to_string(*value);
 			break;
 		}
+		case ControlTypeUnsigned32: {
+			const uint32_t *value = reinterpret_cast<const uint32_t *>(data);
+			str += std::to_string(*value);
+			break;
+		}
 		case ControlTypeInteger32: {
 			const int32_t *value = reinterpret_cast<const int32_t *>(data);
 			str += std::to_string(*value);
diff --git a/src/libcamera/v4l2_device.cpp b/src/libcamera/v4l2_device.cpp
index 68add4f2e..0ba8dcfa0 100644
--- a/src/libcamera/v4l2_device.cpp
+++ b/src/libcamera/v4l2_device.cpp
@@ -9,6 +9,7 @@
 
 #include <fcntl.h>
 #include <map>
+#include <stdint.h>
 #include <stdlib.h>
 #include <string.h>
 #include <sys/ioctl.h>
@@ -17,11 +18,14 @@
 #include <vector>
 
 #include <linux/v4l2-mediabus.h>
+#include <linux/videodev2.h>
 
 #include <libcamera/base/event_notifier.h>
 #include <libcamera/base/log.h>
 #include <libcamera/base/utils.h>
 
+#include <libcamera/controls.h>
+
 #include "libcamera/internal/formats.h"
 #include "libcamera/internal/sysfs.h"
 
@@ -488,6 +492,9 @@ ControlType V4L2Device::v4l2CtrlType(uint32_t ctrlType)
 	case V4L2_CTRL_TYPE_BOOLEAN:
 		return ControlTypeBool;
 
+	case V4L2_CTRL_TYPE_U32:
+		return ControlTypeUnsigned32;
+
 	case V4L2_CTRL_TYPE_INTEGER:
 		return ControlTypeInteger32;
 
@@ -536,6 +543,11 @@ std::optional<ControlInfo> V4L2Device::v4l2ControlInfo(const v4l2_query_ext_ctrl
 				   static_cast<uint8_t>(ctrl.maximum),
 				   static_cast<uint8_t>(ctrl.default_value));
 
+	case V4L2_CTRL_TYPE_U32:
+		return ControlInfo(static_cast<uint32_t>(ctrl.minimum),
+				   static_cast<uint32_t>(ctrl.maximum),
+				   static_cast<uint32_t>(ctrl.default_value));
+
 	case V4L2_CTRL_TYPE_BOOLEAN:
 		return ControlInfo(static_cast<bool>(ctrl.minimum),
 				   static_cast<bool>(ctrl.maximum),
@@ -622,6 +634,7 @@ void V4L2Device::listControls()
 		case V4L2_CTRL_TYPE_BITMASK:
 		case V4L2_CTRL_TYPE_INTEGER_MENU:
 		case V4L2_CTRL_TYPE_U8:
+		case V4L2_CTRL_TYPE_U32:
 			break;
 		/* \todo Support other control types. */
 		default:
-- 
2.47.0.105.g07ac214952-goog