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libcamera: V4L2Subdevice: Get device by regexp

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Some kernel drivers give their entities names that will differ from
implementation to implementation; for example the drivers for the
Camera Receiver Unit and CSI-2 receiver in the RZ/V2H(P) SoC give their
entities names that include their memory address, in the format
"csi-16000400.csi2". Passing that entity name to
V4L2Subdevice::fromEntityName() is too inflexible given it would only
then work if that specific CSI-2 receiver were the one being used.

Add an overload for V4L2Subdevice::fromEntityName() to instead allow
users to pass a std::basic_regex, and use std::regex_search() instead
of a direct string comparison to find a matching entity. Ths allows
us to form regular expressions like "csi-[0-9a-f]{8}.csi2" to find
the entities.

Signed-off-by: Daniel Scally <dan.scally@ideasonboard.com>
Reviewed-by: Stefan Klug <stefan.klug@ideasonboard.com>
Reviewed-by: Jacopo Mondi <jacopo.mondi@ideasonboard.com>
Signed-off-by: Jacopo Mondi <jacopo.mondi@ideasonboard.com>
This commit is contained in:
Daniel Scally
2025-07-15 16:13:05 +01:00
committed by Jacopo Mondi
parent 1e92c4cc0d
commit f4c3dee217
2 changed files with 21 additions and 1 deletions
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src/libcamera/v4l2_subdevice.cpp
+18 -1
View File
@@ -1748,7 +1748,6 @@ const std::string &V4L2Subdevice::model()
* \a media
* \param[in] media The media device where the entity is registered
* \param[in] entity The media entity name
*
* \return A newly created V4L2Subdevice on success, nullptr otherwise
*/
std::unique_ptr<V4L2Subdevice>
@@ -1762,6 +1761,24 @@ V4L2Subdevice::fromEntityName(const MediaDevice *media,
return std::make_unique<V4L2Subdevice>(mediaEntity);
}
/**
* \brief Create a new video subdevice instance from an entity in media device
* \a media
* \param[in] media The media device where the entity is registered
* \param[in] entity A regex that will match the media entity's name
* \return A newly created V4L2Subdevice on success, nullptr otherwise
*/
std::unique_ptr<V4L2Subdevice>
V4L2Subdevice::fromEntityName(const MediaDevice *media,
const std::regex &entity)
{
MediaEntity *mediaEntity = media->getEntityByName(entity);
if (!mediaEntity)
return nullptr;
return std::make_unique<V4L2Subdevice>(mediaEntity);
}
std::string V4L2Subdevice::logPrefix() const
{
return "'" + entity_->name() + "'";