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authorNiklas Söderlund <niklas.soderlund@ragnatech.se>2018-12-21 02:38:32 +0100
committerNiklas Söderlund <niklas.soderlund@ragnatech.se>2018-12-31 00:58:15 +0100
commitaf8c212600f9c609ef63819f7aa0ff10fbf7ee63 (patch)
treec5823f0f6cac25244f3f90abac0d9cfb2cf6aa79 /src
parentc0d39bab5bf3be585a7860d51429913187d05f04 (diff)
libcamera: device_enumerator: add DeviceEnumerator class
Provide a DeviceEnumerator base class which enumerates all media devices in the system and information about them, resolving Media Controller data structures to paths and a method to search in all the enumerated information. Signed-off-by: Niklas Söderlund <niklas.soderlund@ragnatech.se> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Diffstat (limited to 'src')
-rw-r--r--src/libcamera/device_enumerator.cpp155
-rw-r--r--src/libcamera/include/device_enumerator.h22
2 files changed, 177 insertions, 0 deletions
diff --git a/src/libcamera/device_enumerator.cpp b/src/libcamera/device_enumerator.cpp
index 61b32bb9..df9e89a1 100644
--- a/src/libcamera/device_enumerator.cpp
+++ b/src/libcamera/device_enumerator.cpp
@@ -5,6 +5,12 @@
* device_enumerator.cpp - Enumeration and matching
*/
+#include <fcntl.h>
+#include <libudev.h>
+#include <string.h>
+#include <sys/ioctl.h>
+#include <unistd.h>
+
#include "device_enumerator.h"
#include "log.h"
@@ -111,4 +117,153 @@ bool DeviceMatch::match(const DeviceInfo *info) const
return true;
}
+/* -----------------------------------------------------------------------------
+ * Enumerator Base
+ */
+
+DeviceEnumerator::~DeviceEnumerator()
+{
+ for (DeviceInfo *dev : devices_) {
+ if (dev->busy())
+ LOG(Error) << "Removing device info while still in use";
+
+ delete dev;
+ }
+}
+
+int DeviceEnumerator::addDevice(const std::string &devnode)
+{
+ int fd, ret;
+
+ struct media_device_info info = {};
+ std::map<std::string, std::string> entities;
+
+ fd = open(devnode.c_str(), O_RDWR);
+ if (fd < 0) {
+ ret = -errno;
+ LOG(Info) << "Unable to open " << devnode <<
+ " (" << strerror(-ret) << "), skipping";
+ return ret;
+ }
+
+ ret = readInfo(fd, info);
+ if (ret)
+ goto out;
+
+ ret = readTopology(fd, entities);
+ if (ret)
+ goto out;
+
+ devices_.push_back(new DeviceInfo(devnode, info, entities));
+out:
+ close(fd);
+
+ return ret;
+}
+
+int DeviceEnumerator::readInfo(int fd, struct media_device_info &info)
+{
+ int ret;
+
+ ret = ioctl(fd, MEDIA_IOC_DEVICE_INFO, &info);
+ if (ret < 0) {
+ ret = -errno;
+ LOG(Info) << "Unable to read device info " <<
+ " (" << strerror(-ret) << "), skipping";
+ return ret;
+ }
+
+ return 0;
+}
+
+int DeviceEnumerator::readTopology(int fd, std::map<std::string, std::string> &entities)
+{
+ struct media_v2_topology topology;
+ struct media_v2_entity *ents = nullptr;
+ struct media_v2_interface *ifaces = nullptr;
+ struct media_v2_link *links = nullptr;
+ int ret;
+
+ while (true) {
+ topology = {};
+
+ ret = ioctl(fd, MEDIA_IOC_G_TOPOLOGY, &topology);
+ if (ret < 0)
+ return -errno;
+
+ __u64 version = topology.topology_version;
+
+ ents = new media_v2_entity[topology.num_entities]();
+ ifaces = new media_v2_interface[topology.num_interfaces]();
+ links = new media_v2_link[topology.num_links]();
+ topology.ptr_entities = reinterpret_cast<__u64>(ents);
+ topology.ptr_interfaces = reinterpret_cast<__u64>(ifaces);
+ topology.ptr_links = reinterpret_cast<__u64>(links);
+
+ ret = ioctl(fd, MEDIA_IOC_G_TOPOLOGY, &topology);
+ if (ret < 0) {
+ ret = -errno;
+ goto done;
+ }
+
+ if (version == topology.topology_version)
+ break;
+
+ delete[] links;
+ delete[] ifaces;
+ delete[] ents;
+ }
+
+ for (unsigned int link_id = 0; link_id < topology.num_links; link_id++) {
+ unsigned int iface_id, ent_id;
+ std::string devnode;
+
+ if ((links[link_id].flags & MEDIA_LNK_FL_LINK_TYPE) !=
+ MEDIA_LNK_FL_INTERFACE_LINK)
+ continue;
+
+ for (iface_id = 0; iface_id < topology.num_interfaces; iface_id++)
+ if (links[link_id].source_id == ifaces[iface_id].id)
+ break;
+
+ for (ent_id = 0; ent_id < topology.num_entities; ent_id++)
+ if (links[link_id].sink_id == ents[ent_id].id)
+ break;
+
+ if (ent_id >= topology.num_entities ||
+ iface_id >= topology.num_interfaces)
+ continue;
+
+ devnode = lookupDevnode(ifaces[iface_id].devnode.major,
+ ifaces[iface_id].devnode.minor);
+ if (devnode == "")
+ break;
+
+ entities[ents[ent_id].name] = devnode;
+ }
+done:
+ delete[] links;
+ delete[] ifaces;
+ delete[] ents;
+
+ return ret;
+}
+
+DeviceInfo *DeviceEnumerator::search(DeviceMatch &dm) const
+{
+ DeviceInfo *info = nullptr;
+
+ for (DeviceInfo *dev : devices_) {
+ if (dev->busy())
+ continue;
+
+ if (dm.match(dev)) {
+ info = dev;
+ break;
+ }
+ }
+
+ return info;
+}
+
} /* namespace libcamera */
diff --git a/src/libcamera/include/device_enumerator.h b/src/libcamera/include/device_enumerator.h
index ed1e986f..1f8cef33 100644
--- a/src/libcamera/include/device_enumerator.h
+++ b/src/libcamera/include/device_enumerator.h
@@ -53,6 +53,28 @@ private:
std::vector<std::string> entities_;
};
+class DeviceEnumerator
+{
+public:
+ virtual ~DeviceEnumerator();
+
+ virtual int init() = 0;
+ virtual int enumerate() = 0;
+
+ DeviceInfo *search(DeviceMatch &dm) const;
+
+protected:
+ int addDevice(const std::string &devnode);
+
+private:
+ std::vector<DeviceInfo *> devices_;
+
+ int readInfo(int fd, struct media_device_info &info);
+ int readTopology(int fd, std::map<std::string, std::string> &entities);
+
+ virtual std::string lookupDevnode(int major, int minor) = 0;
+};
+
} /* namespace libcamera */
#endif /* __LIBCAMERA_DEVICE_ENUMERATOR_H__ */