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/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
* Copyright (C) 2019, Google Inc.
*
* media_device_link_test.cpp - Tests link handling on VIMC media device
*/
#include <iostream>
#include <memory>
#include "device_enumerator.h"
#include "media_device.h"
#include "test.h"
using namespace libcamera;
using namespace std;
/*
* This link test requires a vimc device in order to exercise the
* MediaObject link handling API on a graph with a predetermined topology.
*
* vimc is a Media Controller kernel driver that creates virtual devices.
* From a userspace point of view they appear as normal media controller
* devices, but are not backed by any particular piece of hardware. They can
* thus be used for testing purpose without depending on a particular hardware
* platform.
*
* If no vimc device is found (most likely because the vimc driver is not
* loaded) the test is skipped.
*/
class MediaDeviceLinkTest : public Test
{
int init()
{
enumerator = unique_ptr<DeviceEnumerator>(DeviceEnumerator::create());
if (!enumerator) {
cerr << "Failed to create device enumerator" << endl;
return TestFail;
}
if (enumerator->enumerate()) {
cerr << "Failed to enumerate media devices" << endl;
return TestFail;
}
DeviceMatch dm("vimc");
dev_ = enumerator->search(dm);
if (!dev_) {
cerr << "No VIMC media device found: skip test" << endl;
return TestSkip;
}
if (!dev_->acquire()) {
cerr << "Unable to acquire media device "
<< dev_->deviceNode() << endl;
return TestSkip;
}
return 0;
}
int run()
{
/*
* First of all disable all links in the media graph to
* ensure we start from a known state.
*/
if (dev_->disableLinks()) {
cerr << "Failed to disable all links in the media graph";
return TestFail;
}
/*
* Test if link can be consistently retrieved through the
* different methods the media device offers.
*/
string linkName("'Debayer A':[1] -> 'Scaler':[0]'");
MediaLink *link = dev_->link("Debayer A", 1, "Scaler", 0);
if (!link) {
cerr << "Unable to find link: " << linkName
<< " using lookup by name" << endl;
return TestFail;
}
MediaEntity *source = dev_->getEntityByName("Debayer A");
if (!source) {
cerr << "Unable to find entity: 'Debayer A'" << endl;
return TestFail;
}
MediaEntity *sink = dev_->getEntityByName("Scaler");
if (!sink) {
cerr << "Unable to find entity: 'Scaler'" << endl;
return TestFail;
}
MediaLink *link2 = dev_->link(source, 1, sink, 0);
if (!link2) {
cerr << "Unable to find link: " << linkName
<< " using lookup by entity" << endl;
return TestFail;
}
if (link != link2) {
cerr << "Link lookup by name and by entity don't match"
<< endl;
return TestFail;
}
link2 = dev_->link(source->getPadByIndex(1),
sink->getPadByIndex(0));
if (!link2) {
cerr << "Unable to find link: " << linkName
<< " using lookup by pad" << endl;
return TestFail;
}
if (link != link2) {
cerr << "Link lookup by name and by pad don't match"
<< endl;
return TestFail;
}
/* After reset the link shall not be enabled. */
if (link->flags() & MEDIA_LNK_FL_ENABLED) {
cerr << "Link " << linkName
<< " should not be enabled after a device reset"
<< endl;
return TestFail;
}
/* Enable the link and test if enabling was successful. */
if (link->setEnabled(true)) {
cerr << "Failed to enable link: " << linkName
<< endl;
return TestFail;
}
if (!(link->flags() & MEDIA_LNK_FL_ENABLED)) {
cerr << "Link " << linkName
<< " was enabled but it is reported as disabled"
<< endl;
return TestFail;
}
/* Disable the link and test if disabling was successful. */
if (link->setEnabled(false)) {
cerr << "Failed to disable link: " << linkName
<< endl;
return TestFail;
}
if (link->flags() & MEDIA_LNK_FL_ENABLED) {
cerr << "Link " << linkName
<< " was disabled but it is reported as enabled"
<< endl;
return TestFail;
}
/* Try to get a non existing link. */
linkName = "'Sensor A':[1] -> 'Scaler':[0]";
link = dev_->link("Sensor A", 1, "Scaler", 0);
if (link) {
cerr << "Link lookup for " << linkName
<< " succeeded but link does not exist"
<< endl;
return TestFail;
}
/* Now get an immutable link and try to disable it. */
linkName = "'Sensor A':[0] -> 'Raw Capture 0':[0]";
link = dev_->link("Sensor A", 0, "Raw Capture 0", 0);
if (!link) {
cerr << "Unable to find link: " << linkName
<< " using lookup by name" << endl;
return TestFail;
}
if (!(link->flags() & MEDIA_LNK_FL_IMMUTABLE)) {
cerr << "Link " << linkName
<< " should be 'IMMUTABLE'" << endl;
return TestFail;
}
/* Disabling an immutable link shall fail. */
if (!link->setEnabled(false)) {
cerr << "Disabling immutable link " << linkName
<< " succeeded but should have failed" << endl;
return TestFail;
}
/*
* Enable an disabled link, and verify it is disabled again
* after disabling all links in the media graph.
*/
linkName = "'Debayer B':[1] -> 'Scaler':[0]'";
link = dev_->link("Debayer B", 1, "Scaler", 0);
if (!link) {
cerr << "Unable to find link: " << linkName
<< " using lookup by name" << endl;
return TestFail;
}
if (link->setEnabled(true)) {
cerr << "Failed to enable link: " << linkName
<< endl;
return TestFail;
}
if (!(link->flags() & MEDIA_LNK_FL_ENABLED)) {
cerr << "Link " << linkName
<< " was enabled but it is reported as disabled"
<< endl;
return TestFail;
}
if (dev_->disableLinks()) {
cerr << "Failed to disable all links in the media graph";
return TestFail;
}
if (link->flags() & MEDIA_LNK_FL_ENABLED) {
cerr << "All links in the media graph have been disabled"
<< " but link " << linkName
<< " is still reported as enabled" << endl;
return TestFail;
}
return 0;
}
void cleanup()
{
dev_->release();
}
private:
unique_ptr<DeviceEnumerator> enumerator;
shared_ptr<MediaDevice> dev_;
};
TEST_REGISTER(MediaDeviceLinkTest);
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