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libcamera: media_device: Fallback to legacy ioctls on older kernels

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Prior to kernel v4.19, the MEDIA_IOC_G_TOPOLOGY ioctl didn't expose
entity flags. Fallback to calling MEDIA_IOC_ENUM_ENTITIES for each
entity to retrieve the flags in that case.

Fixes: 67d313240c ("libcamera: pipeline: uvcvideo: create a V4L2Device for the default video entity")
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
This commit is contained in:
Laurent Pinchart
2019-01-26 10:54:43 +02:00
parent ac0a3d7fb6
commit e4d2dcc549
2 changed files with 41 additions and 3 deletions
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src/libcamera/include/media_device.h
+3
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@@ -56,6 +56,8 @@ private:
std::string driver_;
std::string deviceNode_;
std::string model_;
unsigned int version_;
int fd_;
bool valid_;
bool acquired_;
@@ -72,6 +74,7 @@ private:
bool populateEntities(const struct media_v2_topology &topology);
bool populatePads(const struct media_v2_topology &topology);
bool populateLinks(const struct media_v2_topology &topology);
void fixupEntityFlags(struct media_v2_entity *entity);
friend int MediaLink::setEnabled(bool enable);
int setupLink(const MediaLink *link, unsigned int flags);