From b9113a86269281ec8cda96140be24e6227abe791 Mon Sep 17 00:00:00 2001
From: Kieran Bingham <kieran.bingham@ideasonboard.com>
Date: Wed, 3 May 2023 21:45:35 +0100
Subject: libcamera: pipeline: Register device numbers with camera

Register the identified device numbers with each camera as the
SystemDevices property.

This facilitates camera daemons or other systems to identify which
devices are being managed by libcamera, and can prevent duplication of
camera resources.

As the SystemDevices property now provides this list of devices, use it
directly from within the CameraManager when adding a Camera rather than
passing it through the internal API.

Tested-by: Ashok Sidipotu <ashok.sidipotu@collabora.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Jacopo Mondi <jacopo.mondi@ideasonboard.com>
Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
---
 src/libcamera/pipeline_handler.cpp | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

(limited to 'src/libcamera/pipeline_handler.cpp')

diff --git a/src/libcamera/pipeline_handler.cpp b/src/libcamera/pipeline_handler.cpp
index 49092ea8..9c74c6cf 100644
--- a/src/libcamera/pipeline_handler.cpp
+++ b/src/libcamera/pipeline_handler.cpp
@@ -17,6 +17,7 @@
 
 #include <libcamera/camera.h>
 #include <libcamera/framebuffer.h>
+#include <libcamera/property_ids.h>
 
 #include "libcamera/internal/camera.h"
 #include "libcamera/internal/camera_manager.h"
@@ -612,7 +613,7 @@ void PipelineHandler::registerCamera(std::shared_ptr<Camera> camera)
 	 * Walk the entity list and map the devnums of all capture video nodes
 	 * to the camera.
 	 */
-	std::vector<dev_t> devnums;
+	std::vector<int64_t> devnums;
 	for (const std::shared_ptr<MediaDevice> &media : mediaDevices_) {
 		for (const MediaEntity *entity : media->entities()) {
 			if (entity->pads().size() == 1 &&
@@ -624,7 +625,14 @@ void PipelineHandler::registerCamera(std::shared_ptr<Camera> camera)
 		}
 	}
 
-	manager_->_d()->addCamera(std::move(camera), devnums);
+	/*
+	 * Store the associated devices as a property of the camera to allow
+	 * systems to identify which devices are managed by libcamera.
+	 */
+	Camera::Private *data = camera->_d();
+	data->properties_.set(properties::SystemDevices, devnums);
+
+	manager_->_d()->addCamera(std::move(camera));
 }
 
 /**
-- 
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