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-rw-r--r--src/libcamera/v4l2_subdevice.cpp122
1 files changed, 118 insertions, 4 deletions
diff --git a/src/libcamera/v4l2_subdevice.cpp b/src/libcamera/v4l2_subdevice.cpp
index 6da77775..82824433 100644
--- a/src/libcamera/v4l2_subdevice.cpp
+++ b/src/libcamera/v4l2_subdevice.cpp
@@ -1366,8 +1366,62 @@ void routeToKernel(const V4L2Subdevice::Route &route,
kroute.flags = route.flags;
}
+/*
+ * Legacy routing support for pre-v6.10-rc1 kernels. Drop when v6.12-rc1 gets
+ * released.
+ */
+struct v4l2_subdev_routing_legacy {
+ __u32 which;
+ __u32 num_routes;
+ __u64 routes;
+ __u32 reserved[6];
+};
+
+#define VIDIOC_SUBDEV_G_ROUTING_LEGACY _IOWR('V', 38, struct v4l2_subdev_routing_legacy)
+#define VIDIOC_SUBDEV_S_ROUTING_LEGACY _IOWR('V', 39, struct v4l2_subdev_routing_legacy)
+
} /* namespace */
+int V4L2Subdevice::getRoutingLegacy(Routing *routing, Whence whence)
+{
+ struct v4l2_subdev_routing_legacy rt = {};
+
+ rt.which = whence;
+
+ int ret = ioctl(VIDIOC_SUBDEV_G_ROUTING_LEGACY, &rt);
+ if (ret == 0 || ret == -ENOTTY)
+ return ret;
+
+ if (ret != -ENOSPC) {
+ LOG(V4L2, Error)
+ << "Failed to retrieve number of routes: "
+ << strerror(-ret);
+ return ret;
+ }
+
+ std::vector<struct v4l2_subdev_route> routes{ rt.num_routes };
+ rt.routes = reinterpret_cast<uintptr_t>(routes.data());
+
+ ret = ioctl(VIDIOC_SUBDEV_G_ROUTING_LEGACY, &rt);
+ if (ret) {
+ LOG(V4L2, Error)
+ << "Failed to retrieve routes: " << strerror(-ret);
+ return ret;
+ }
+
+ if (rt.num_routes != routes.size()) {
+ LOG(V4L2, Error) << "Invalid number of routes";
+ return -EINVAL;
+ }
+
+ routing->resize(rt.num_routes);
+
+ for (const auto &[i, route] : utils::enumerate(routes))
+ routeFromKernel((*routing)[i], route);
+
+ return 0;
+}
+
/**
* \brief Retrieve the subdevice's internal routing table
* \param[out] routing The routing table
@@ -1388,19 +1442,25 @@ int V4L2Subdevice::getRouting(Routing *routing, Whence whence)
rt.which = whence;
int ret = ioctl(VIDIOC_SUBDEV_G_ROUTING, &rt);
- if (ret == 0 || ret == -ENOTTY)
- return ret;
+ if (ret == -ENOTTY)
+ return V4L2Subdevice::getRoutingLegacy(routing, whence);
- if (ret != -ENOSPC) {
+ if (ret) {
LOG(V4L2, Error)
<< "Failed to retrieve number of routes: "
<< strerror(-ret);
return ret;
}
+ if (!rt.num_routes)
+ return 0;
+
std::vector<struct v4l2_subdev_route> routes{ rt.num_routes };
rt.routes = reinterpret_cast<uintptr_t>(routes.data());
+ rt.len_routes = rt.num_routes;
+ rt.num_routes = 0;
+
ret = ioctl(VIDIOC_SUBDEV_G_ROUTING, &rt);
if (ret) {
LOG(V4L2, Error)
@@ -1421,6 +1481,33 @@ int V4L2Subdevice::getRouting(Routing *routing, Whence whence)
return 0;
}
+int V4L2Subdevice::setRoutingLegacy(Routing *routing, Whence whence)
+{
+ std::vector<struct v4l2_subdev_route> routes{ routing->size() };
+
+ for (const auto &[i, route] : utils::enumerate(*routing))
+ routeToKernel(route, routes[i]);
+
+ struct v4l2_subdev_routing_legacy rt = {};
+ rt.which = whence;
+ rt.num_routes = routes.size();
+ rt.routes = reinterpret_cast<uintptr_t>(routes.data());
+
+ int ret = ioctl(VIDIOC_SUBDEV_S_ROUTING_LEGACY, &rt);
+ if (ret) {
+ LOG(V4L2, Error) << "Failed to set routes: " << strerror(-ret);
+ return ret;
+ }
+
+ routes.resize(rt.num_routes);
+ routing->resize(rt.num_routes);
+
+ for (const auto &[i, route] : utils::enumerate(routes))
+ routeFromKernel((*routing)[i], route);
+
+ return 0;
+}
+
/**
* \brief Set a routing table on the V4L2 subdevice
* \param[inout] routing The routing table
@@ -1447,16 +1534,43 @@ int V4L2Subdevice::setRouting(Routing *routing, Whence whence)
struct v4l2_subdev_routing rt = {};
rt.which = whence;
+ rt.len_routes = routes.size();
rt.num_routes = routes.size();
rt.routes = reinterpret_cast<uintptr_t>(routes.data());
int ret = ioctl(VIDIOC_SUBDEV_S_ROUTING, &rt);
+ if (ret == -ENOTTY)
+ return setRoutingLegacy(routing, whence);
+
if (ret) {
LOG(V4L2, Error) << "Failed to set routes: " << strerror(-ret);
return ret;
}
- routes.resize(rt.num_routes);
+ /*
+ * The kernel may want to return more routes than we have space for. In
+ * that event, we must issue a VIDIOC_SUBDEV_G_ROUTING call to retrieve
+ * the additional routes.
+ */
+ if (rt.num_routes > routes.size()) {
+ routes.resize(rt.num_routes);
+
+ rt.len_routes = rt.num_routes;
+ rt.num_routes = 0;
+
+ ret = ioctl(VIDIOC_SUBDEV_G_ROUTING, &rt);
+ if (ret) {
+ LOG(V4L2, Error)
+ << "Failed to retrieve routes: " << strerror(-ret);
+ return ret;
+ }
+ }
+
+ if (rt.num_routes != routes.size()) {
+ LOG(V4L2, Error) << "Invalid number of routes";
+ return -EINVAL;
+ }
+
routing->resize(rt.num_routes);
for (const auto &[i, route] : utils::enumerate(routes))