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-rw-r--r--src/libcamera/pipeline/uvcvideo/uvcvideo.cpp31
1 files changed, 27 insertions, 4 deletions
diff --git a/src/libcamera/pipeline/uvcvideo/uvcvideo.cpp b/src/libcamera/pipeline/uvcvideo/uvcvideo.cpp
index 2ebf2788..53b2f23a 100644
--- a/src/libcamera/pipeline/uvcvideo/uvcvideo.cpp
+++ b/src/libcamera/pipeline/uvcvideo/uvcvideo.cpp
@@ -501,12 +501,35 @@ int UVCCameraData::init(MediaDevice *media)
video_->bufferReady.connect(this, &UVCCameraData::bufferReady);
+ properties_.set(properties::Model, utils::toAscii(media->model()));
+
/*
- * \todo Find a way to tell internal and external UVC cameras apart.
- * Until then, treat all UVC cameras as external.
+ * Derive the location from the device removable attribute in sysfs.
+ * Non-removable devices are assumed to be front as we lack detailed
+ * location information, and removable device are considered external.
+ *
+ * The sysfs removable attribute is derived from the ACPI _UPC attribute
+ * if available, or from the USB hub descriptors otherwise. ACPI data
+ * may not be very reliable, and the USB hub descriptors may not be
+ * accurate on DT-based platforms. A heuristic may need to be
+ * implemented later if too many devices end up being miscategorized.
+ *
+ * \todo Find a way to tell front and back devices apart. This could
+ * come from the ACPI _PLD, but that may be even more unreliable than
+ * the _UPC.
*/
- properties_.set(properties::Location, properties::CameraLocationExternal);
- properties_.set(properties::Model, utils::toAscii(media->model()));
+ properties::LocationEnum location = properties::CameraLocationExternal;
+ std::ifstream file(video_->devicePath() + "/../removable");
+ if (file.is_open()) {
+ std::string value;
+ std::getline(file, value);
+ file.close();
+
+ if (value == "fixed")
+ location = properties::CameraLocationFront;
+ }
+
+ properties_.set(properties::Location, location);
/*
* Get the current format in order to initialize the sensor array