blob: 14e027c3e7d18f0dbaefb533b9bbbb8287abd49f [file] [log] [blame]
/* SPDX-License-Identifier: LGPL-2.1-or-later */
/*
* Copyright (C) 2019, Google Inc.
*
* v4l2_camera_proxy.h - Proxy to V4L2 compatibility camera
*/
#pragma once
#include <linux/videodev2.h>
#include <map>
#include <memory>
#include <set>
#include <sys/types.h>
#include <vector>
#include <libcamera/base/mutex.h>
#include <libcamera/camera.h>
#include "v4l2_camera.h"
class V4L2CameraFile;
class V4L2CameraProxy
{
public:
V4L2CameraProxy(unsigned int index, std::shared_ptr<libcamera::Camera> camera);
int open(V4L2CameraFile *file);
void close(V4L2CameraFile *file);
void *mmap(void *addr, size_t length, int prot, int flags, off64_t offset);
int munmap(void *addr, size_t length);
int ioctl(V4L2CameraFile *file, unsigned long request, void *arg);
private:
bool validateBufferType(uint32_t type);
bool validateMemoryType(uint32_t memory);
void setFmtFromConfig(const libcamera::StreamConfiguration &streamConfig);
void querycap(std::shared_ptr<libcamera::Camera> camera);
int tryFormat(struct v4l2_format *arg);
enum v4l2_priority maxPriority();
void updateBuffers();
void freeBuffers();
int vidioc_querycap(struct v4l2_capability *arg);
int vidioc_enum_framesizes(V4L2CameraFile *file, struct v4l2_frmsizeenum *arg);
int vidioc_enum_fmt(V4L2CameraFile *file, struct v4l2_fmtdesc *arg);
int vidioc_g_fmt(V4L2CameraFile *file, struct v4l2_format *arg);
int vidioc_s_fmt(V4L2CameraFile *file, struct v4l2_format *arg);
int vidioc_try_fmt(V4L2CameraFile *file, struct v4l2_format *arg);
int vidioc_g_priority(V4L2CameraFile *file, enum v4l2_priority *arg);
int vidioc_s_priority(V4L2CameraFile *file, enum v4l2_priority *arg);
int vidioc_enuminput(V4L2CameraFile *file, struct v4l2_input *arg);
int vidioc_g_input(V4L2CameraFile *file, int *arg);
int vidioc_s_input(V4L2CameraFile *file, int *arg);
int vidioc_reqbufs(V4L2CameraFile *file, struct v4l2_requestbuffers *arg);
int vidioc_querybuf(V4L2CameraFile *file, struct v4l2_buffer *arg);
int vidioc_qbuf(V4L2CameraFile *file, struct v4l2_buffer *arg);
int vidioc_dqbuf(V4L2CameraFile *file, struct v4l2_buffer *arg,
libcamera::Mutex *lock) LIBCAMERA_TSA_REQUIRES(*lock);
int vidioc_expbuf(V4L2CameraFile *file, struct v4l2_exportbuffer *arg);
int vidioc_streamon(V4L2CameraFile *file, int *arg);
int vidioc_streamoff(V4L2CameraFile *file, int *arg);
bool hasOwnership(V4L2CameraFile *file);
int acquire(V4L2CameraFile *file);
void release(V4L2CameraFile *file);
static const std::set<unsigned long> supportedIoctls_;
unsigned int refcount_;
unsigned int index_;
libcamera::StreamConfiguration streamConfig_;
unsigned int bufferCount_;
unsigned int currentBuf_;
unsigned int sizeimage_;
struct v4l2_capability capabilities_;
struct v4l2_pix_format v4l2PixFormat_;
std::vector<struct v4l2_buffer> buffers_;
std::map<void *, unsigned int> mmaps_;
std::set<V4L2CameraFile *> files_;
std::unique_ptr<V4L2Camera> vcam_;
/*
* This is the exclusive owner of this V4L2CameraProxy instance.
* When there is no owner, anybody can call any ioctl before reqbufs.
* The first file to call reqbufs with count > 0 or s_fmt will become
* the owner, and when the owner calls reqbufs with count = 0 it will
* release ownership. Any buffer-related ioctl (except querybuf) or
* s_fmt that is called by a non-owner while there exists an owner
* will return -EBUSY.
*/
V4L2CameraFile *owner_;
/* This mutex is to serialize access to the proxy. */
libcamera::Mutex proxyMutex_;
};