diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/libcamera/v4l2_subdevice.cpp | 122 |
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)) |