From c3ab0fa0ce7831f2c97133755ab7e4690e398f10 Mon Sep 17 00:00:00 2001
From: Hirokazu Honda <hiroh@chromium.org>
Date: Fri, 23 Apr 2021 18:36:53 +0900
Subject: libcamera: V4L2Device: Use Span in updateControls()

V4L2Device::updateControls() takes two arguments, raw array and
its size, for the v4l2_ext_control values. This replaces it with
libcamera::Span.

Signed-off-by: Hirokazu Honda <hiroh@chromium.org>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Tested-by: Jacopo Mondi <jacopo@jmondi.org>
---
 include/libcamera/internal/v4l2_device.h |  4 ++--
 src/libcamera/v4l2_device.cpp            | 10 ++++------
 2 files changed, 6 insertions(+), 8 deletions(-)

diff --git a/include/libcamera/internal/v4l2_device.h b/include/libcamera/internal/v4l2_device.h
index d006bf68..087f07e7 100644
--- a/include/libcamera/internal/v4l2_device.h
+++ b/include/libcamera/internal/v4l2_device.h
@@ -14,6 +14,7 @@
 #include <linux/videodev2.h>
 
 #include <libcamera/signal.h>
+#include <libcamera/span.h>
 
 #include "libcamera/internal/log.h"
 #include "libcamera/internal/v4l2_controls.h"
@@ -55,8 +56,7 @@ protected:
 private:
 	void listControls();
 	void updateControls(ControlList *ctrls,
-			    const struct v4l2_ext_control *v4l2Ctrls,
-			    unsigned int count);
+			    Span<const v4l2_ext_control> v4l2Ctrls);
 
 	void eventAvailable(EventNotifier *notifier);
 
diff --git a/src/libcamera/v4l2_device.cpp b/src/libcamera/v4l2_device.cpp
index 6a2bfffe..397029ac 100644
--- a/src/libcamera/v4l2_device.cpp
+++ b/src/libcamera/v4l2_device.cpp
@@ -253,7 +253,7 @@ ControlList V4L2Device::getControls(const std::vector<uint32_t> &ids)
 		v4l2Ctrls.resize(errorIdx);
 	}
 
-	updateControls(&ctrls, v4l2Ctrls.data(), v4l2Ctrls.size());
+	updateControls(&ctrls, v4l2Ctrls);
 
 	return ctrls;
 }
@@ -352,7 +352,7 @@ int V4L2Device::setControls(ControlList *ctrls)
 		ret = errorIdx;
 	}
 
-	updateControls(ctrls, v4l2Ctrls.data(), v4l2Ctrls.size());
+	updateControls(ctrls, v4l2Ctrls);
 
 	return ret;
 }
@@ -516,15 +516,13 @@ void V4L2Device::listControls()
  * values in \a v4l2Ctrls
  * \param[inout] ctrls List of V4L2 controls to update
  * \param[in] v4l2Ctrls List of V4L2 extended controls as returned by the driver
- * \param[in] count The number of controls to update
  */
 void V4L2Device::updateControls(ControlList *ctrls,
-				const struct v4l2_ext_control *v4l2Ctrls,
-				unsigned int count)
+				Span<const v4l2_ext_control> v4l2Ctrls)
 {
 	unsigned int i = 0;
 	for (auto &ctrl : *ctrls) {
-		if (i == count)
+		if (i == v4l2Ctrls.size())
 			break;
 
 		const struct v4l2_ext_control *v4l2Ctrl = &v4l2Ctrls[i];
-- 
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