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Note that there may be multiple buffers * with the same timestamp value, so you can restart the search * by setting @start_idx to the previously found index + 1. * * Returns the buffer index of the buffer with the given @timestamp, or * -1 if no buffer with @timestamp was found. */ int vb2_find_timestamp(const struct vb2_queue *q, u64 timestamp, unsigned int start_idx); int vb2_querybuf(struct vb2_queue *q, struct v4l2_buffer *b); /** * vb2_reqbufs() - Wrapper for vb2_core_reqbufs() that also verifies * the memory and type values. * * @q: pointer to &struct vb2_queue with videobuf2 queue. * @req: &struct v4l2_requestbuffers passed from userspace to * &v4l2_ioctl_ops->vidioc_reqbufs handler in driver. */ int vb2_reqbufs(struct vb2_queue *q, struct v4l2_requestbuffers *req); /** * vb2_create_bufs() - Wrapper for vb2_core_create_bufs() that also verifies * the memory and type values. * * @q: pointer to &struct vb2_queue with videobuf2 queue. * @create: creation parameters, passed from userspace to * &v4l2_ioctl_ops->vidioc_create_bufs handler in driver */ int vb2_create_bufs(struct vb2_queue *q, struct v4l2_create_buffers *create); /** * vb2_prepare_buf() - Pass ownership of a buffer from userspace to the kernel * * @q: pointer to &struct vb2_queue with videobuf2 queue. * @mdev: pointer to &struct media_device, may be NULL. * @b: buffer structure passed from userspace to * &v4l2_ioctl_ops->vidioc_prepare_buf handler in driver * * Should be called from &v4l2_ioctl_ops->vidioc_prepare_buf ioctl handler * of a driver. * * This function: * * #) verifies the passed buffer, * #) calls &vb2_ops->buf_prepare callback in the driver (if provided), * in which driver-specific buffer initialization can be performed. * #) if @b->request_fd is non-zero and @mdev->ops->req_queue is set, * then bind the prepared buffer to the request. * * The return values from this function are intended to be directly returned * from &v4l2_ioctl_ops->vidioc_prepare_buf handler in driver. */ int vb2_prepare_buf(struct vb2_queue *q, struct media_device *mdev, struct v4l2_buffer *b); /** * vb2_qbuf() - Queue a buffer from userspace * @q: pointer to &struct vb2_queue with videobuf2 queue. * @mdev: pointer to &struct media_device, may be NULL. * @b: buffer structure passed from userspace to * &v4l2_ioctl_ops->vidioc_qbuf handler in driver * * Should be called from &v4l2_ioctl_ops->vidioc_qbuf handler of a driver. * * This function: * * #) verifies the passed buffer; * #) if @b->request_fd is non-zero and @mdev->ops->req_queue is set, * then bind the buffer to the request. * #) if necessary, calls &vb2_ops->buf_prepare callback in the driver * (if provided), in which driver-specific buffer initialization can * be performed; * #) if streaming is on, queues the buffer in driver by the means of * &vb2_ops->buf_queue callback for processing. * * The return values from this function are intended to be directly returned * from &v4l2_ioctl_ops->vidioc_qbuf handler in driver. */ int vb2_qbuf(struct vb2_queue *q, struct media_device *mdev, struct v4l2_buffer *b); /** * vb2_expbuf() - Export a buffer as a file descriptor * @q: pointer to &struct vb2_queue with videobuf2 queue. * @eb: export buffer structure passed from userspace to * &v4l2_ioctl_ops->vidioc_expbuf handler in driver * * The return values from this function are intended to be directly returned * from &v4l2_ioctl_ops->vidioc_expbuf handler in driver. */ int vb2_expbuf(struct vb2_queue *q, struct v4l2_exportbuffer *eb); /** * vb2_dqbuf() - Dequeue a buffer to the userspace * @q: pointer to &struct vb2_queue with videobuf2 queue. * @b: buffer structure passed from userspace to * &v4l2_ioctl_ops->vidioc_dqbuf handler in driver * @nonblocking: if true, this call will not sleep waiting for a buffer if no * buffers ready for dequeuing are present. Normally the driver * would be passing (&file->f_flags & %O_NONBLOCK) here * * Should be called from &v4l2_ioctl_ops->vidioc_dqbuf ioctl handler * of a driver. * * This function: * * #) verifies the passed buffer; * #) calls &vb2_ops->buf_finish callback in the driver (if provided), in which * driver can perform any additional operations that may be required before * returning the buffer to userspace, such as cache sync; * #) the buffer struct members are filled with relevant information for * the userspace. * * The return values from this function are intended to be directly returned * from &v4l2_ioctl_ops->vidioc_dqbuf handler in driver. */ int vb2_dqbuf(struct vb2_queue *q, struct v4l2_buffer *b, bool nonblocking); /** * vb2_streamon - start streaming * @q: pointer to &struct vb2_queue with videobuf2 queue. * @type: type argument passed from userspace to vidioc_streamon handler, * as defined by &enum v4l2_buf_type. * * Should be called from &v4l2_ioctl_ops->vidioc_streamon handler of a driver. * * This function: * * 1) verifies current state * 2) passes any previously queued buffers to the driver and starts streaming * * The return values from this function are intended to be directly returned * from &v4l2_ioctl_ops->vidioc_streamon handler in the driver. */ int vb2_streamon(struct vb2_queue *q, enum v4l2_buf_type type); /** * vb2_streamoff - stop streaming * @q: pointer to &struct vb2_queue with videobuf2 queue. * @type: type argument passed from userspace to vidioc_streamoff handler * * Should be called from vidioc_streamoff handler of a driver. * * This function: * * #) verifies current state, * #) stop streaming and dequeues any queued buffers, including those previously * passed to the driver (after waiting for the driver to finish). * * This call can be used for pausing playback. * The return values from this function are intended to be directly returned * from vidioc_streamoff handler in the driver */ int vb2_streamoff(struct vb2_queue *q, enum v4l2_buf_type type); /** * vb2_queue_init() - initialize a videobuf2 queue * @q: pointer to &struct vb2_queue with videobuf2 queue. * * The vb2_queue structure should be allocated by the driver. The driver is * responsible of clearing it's content and setting initial values for some * required entries before calling this function. * q->ops, q->mem_ops, q->type and q->io_modes are mandatory. Please refer * to the struct vb2_queue description in include/media/videobuf2-core.h * for more information. */ int __must_check vb2_queue_init(struct vb2_queue *q); /** * vb2_queue_release() - stop streaming, release the queue and free memory * @q: pointer to &struct vb2_queue with videobuf2 queue. * * This function stops streaming and performs necessary clean ups, including * freeing video buffer memory. The driver is responsible for freeing * the vb2_queue structure itself. */ void vb2_queue_release(struct vb2_queue *q); /** * vb2_poll() - implements poll userspace operation * @q: pointer to &struct vb2_queue with videobuf2 queue. * @file: file argument passed to the poll file operation handler * @wait: wait argument passed to the poll file operation handler * * This function implements poll file operation handler for a driver. * For CAPTURE queues, if a buffer is ready to be dequeued, the userspace will * be informed that the file descriptor of a video device is available for * reading. * For OUTPUT queues, if a buffer is ready to be dequeued, the file descriptor * will be reported as available for writing. * * If the driver uses struct v4l2_fh, then vb2_poll() will also check for any * pending events. * * The return values from this function are intended to be directly returned * from poll handler in driver. */ __poll_t vb2_poll(struct vb2_queue *q, struct file *file, poll_table *wait); /* * The following functions are not part of the vb2 core API, but are simple * helper functions that you can use in your struct v4l2_file_operations, * struct v4l2_ioctl_ops and struct vb2_ops. They will serialize if vb2_queue->lock * or video_device->lock is set, and they will set and test vb2_queue->owner * to check if the calling filehandle is permitted to do the queuing operation. */ /* struct v4l2_ioctl_ops helpers */ int vb2_ioctl_reqbufs(struct file *file, void *priv, struct v4l2_requestbuffers *p); int vb2_ioctl_create_bufs(struct file *file, void *priv, struct v4l2_create_buffers *p); int vb2_ioctl_prepare_buf(struct file *file, void *priv, struct v4l2_buffer *p); int vb2_ioctl_querybuf(struct file *file, void *priv, struct v4l2_buffer *p); int vb2_ioctl_qbuf(struct file *file, void *priv, struct v4l2_buffer *p); int vb2_ioctl_dqbuf(struct file *file, void *priv, struct v4l2_buffer *p); int vb2_ioctl_streamon(struct file *file, void *priv, enum v4l2_buf_type i); int vb2_ioctl_streamoff(struct file *file, void *priv, enum v4l2_buf_type i); int vb2_ioctl_expbuf(struct file *file, void *priv, struct v4l2_exportbuffer *p); /* struct v4l2_file_operations helpers */ int vb2_fop_mmap(struct file *file, struct vm_area_struct *vma); int vb2_fop_release(struct file *file); int _vb2_fop_release(struct file *file, struct mutex *lock); ssize_t vb2_fop_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos); ssize_t vb2_fop_read(struct file *file, char __user *buf, size_t count, loff_t *ppos); __poll_t vb2_fop_poll(struct file *file, poll_table *wait); #ifndef CONFIG_MMU unsigned long vb2_fop_get_unmapped_area(struct file *file, unsigned long addr, unsigned long len, unsigned long pgoff, unsigned long flags); #endif /** * vb2_ops_wait_prepare - helper function to lock a struct &vb2_queue * * @vq: pointer to &struct vb2_queue * * ..note:: only use if vq->lock is non-NULL. */ void vb2_ops_wait_prepare(struct vb2_queue *vq); /** * vb2_ops_wait_finish - helper function to unlock a struct &vb2_queue * * @vq: pointer to &struct vb2_queue * * ..note:: only use if vq->lock is non-NULL. */ void vb2_ops_wait_finish(struct vb2_queue *vq); struct media_request; int vb2_request_validate(struct media_request *req); void vb2_request_queue(struct media_request *req); #endif /* _MEDIA_VIDEOBUF2_V4L2_H */