test: v4l2_videodevice: Add V4L2 control test

Add a test that exercises the control enumeration, get and set APIs on a
V4L2Device.

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

test/v4l2_videodevice/controls.cpp

@@ -0,0 +1,93 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * Copyright (C) 2019, Google Inc.
+ *
+ * controls.cpp - V4L2 device controls handling test
+ */
+
+#include <climits>
+#include <iostream>
+
+#include "v4l2_videodevice.h"
+
+#include "v4l2_videodevice_test.h"
+
+using namespace std;
+using namespace libcamera;
+
+class V4L2ControlTest : public V4L2VideoDeviceTest
+{
+public:
+	V4L2ControlTest()
+		: V4L2VideoDeviceTest("vivid", "vivid-000-vid-cap")
+	{
+	}
+
+protected:
+	int run()
+	{
+		const V4L2ControlInfoMap &info = capture_->controls();
+
+		/* Test control enumeration. */
+		if (info.empty()) {
+			cerr << "Failed to enumerate controls" << endl;
+			return TestFail;
+		}
+
+		if (info.find(V4L2_CID_BRIGHTNESS) == info.end() ||
+		    info.find(V4L2_CID_CONTRAST) == info.end() ||
+		    info.find(V4L2_CID_SATURATION) == info.end()) {
+			cerr << "Missing controls" << endl;
+			return TestFail;
+		}
+
+		const V4L2ControlInfo &brightness = info.find(V4L2_CID_BRIGHTNESS)->second;
+		const V4L2ControlInfo &contrast = info.find(V4L2_CID_CONTRAST)->second;
+		const V4L2ControlInfo &saturation = info.find(V4L2_CID_SATURATION)->second;
+
+		/* Test getting controls. */
+		V4L2ControlList ctrls;
+		ctrls.add(V4L2_CID_BRIGHTNESS);
+		ctrls.add(V4L2_CID_CONTRAST);
+		ctrls.add(V4L2_CID_SATURATION);
+
+		int ret = capture_->getControls(&ctrls);
+		if (ret) {
+			cerr << "Failed to get controls" << endl;
+			return TestFail;
+		}
+
+		/* Test setting controls. */
+		ctrls[V4L2_CID_BRIGHTNESS]->value() = brightness.range().min();
+		ctrls[V4L2_CID_CONTRAST]->value() = contrast.range().max();
+		ctrls[V4L2_CID_SATURATION]->value() = saturation.range().min();
+
+		ret = capture_->setControls(&ctrls);
+		if (ret) {
+			cerr << "Failed to set controls" << endl;
+			return TestFail;
+		}
+
+		/* Test setting controls outside of range. */
+		ctrls[V4L2_CID_BRIGHTNESS]->value() = brightness.range().min().get<int32_t>() - 1;
+		ctrls[V4L2_CID_CONTRAST]->value() = contrast.range().max().get<int32_t>() + 1;
+		ctrls[V4L2_CID_SATURATION]->value() = saturation.range().min().get<int32_t>() + 1;
+
+		ret = capture_->setControls(&ctrls);
+		if (ret) {
+			cerr << "Failed to set controls (out of range)" << endl;
+			return TestFail;
+		}
+
+		if (ctrls[V4L2_CID_BRIGHTNESS]->value() != brightness.range().min() ||
+		    ctrls[V4L2_CID_CONTRAST]->value() != brightness.range().max() ||
+		    ctrls[V4L2_CID_SATURATION]->value() != saturation.range().min().get<int32_t>() + 1) {
+			cerr << "Controls not updated when set" << endl;
+			return TestFail;
+		}
+
+		return TestPass;
+	}
+};
+
+TEST_REGISTER(V4L2ControlTest);

test/v4l2_videodevice/meson.build

@@ -2,6 +2,7 @@
 # They are not alphabetically sorted.
 v4l2_videodevice_tests = [
     [ 'double_open',        'double_open.cpp' ],
+    [ 'controls',           'controls.cpp' ],
     [ 'formats',            'formats.cpp' ],
     [ 'request_buffers',    'request_buffers.cpp' ],
     [ 'stream_on_off',      'stream_on_off.cpp' ],