1 /* 2 * videobuf2-v4l2.h - V4L2 driver helper framework 3 * 4 * Copyright (C) 2010 Samsung Electronics 5 * 6 * Author: Pawel Osciak <pawel@osciak.com> 7 * 8 * This program is free software; you can redistribute it and/or modify 9 * it under the terms of the GNU General Public License as published by 10 * the Free Software Foundation. 11 */ 12 #ifndef _MEDIA_VIDEOBUF2_V4L2_H 13 #define _MEDIA_VIDEOBUF2_V4L2_H 14 15 #include <linux/videodev2.h> 16 #include <media/videobuf2-core.h> 17 18 #if VB2_MAX_FRAME != VIDEO_MAX_FRAME 19 #error VB2_MAX_FRAME != VIDEO_MAX_FRAME 20 #endif 21 22 #if VB2_MAX_PLANES != VIDEO_MAX_PLANES 23 #error VB2_MAX_PLANES != VIDEO_MAX_PLANES 24 #endif 25 26 /** 27 * struct vb2_v4l2_buffer - video buffer information for v4l2 28 * @vb2_buf: video buffer 2 29 * @flags: buffer informational flags 30 * @field: enum v4l2_field; field order of the image in the buffer 31 * @timecode: frame timecode 32 * @sequence: sequence count of this frame 33 * Should contain enough information to be able to cover all the fields 34 * of struct v4l2_buffer at videodev2.h 35 */ 36 struct vb2_v4l2_buffer { 37 struct vb2_buffer vb2_buf; 38 39 __u32 flags; 40 __u32 field; 41 struct v4l2_timecode timecode; 42 __u32 sequence; 43 }; 44 45 /* 46 * to_vb2_v4l2_buffer() - cast struct vb2_buffer * to struct vb2_v4l2_buffer * 47 */ 48 #define to_vb2_v4l2_buffer(vb) \ 49 container_of(vb, struct vb2_v4l2_buffer, vb2_buf) 50 51 int vb2_querybuf(struct vb2_queue *q, struct v4l2_buffer *b); 52 int vb2_reqbufs(struct vb2_queue *q, struct v4l2_requestbuffers *req); 53 54 int vb2_create_bufs(struct vb2_queue *q, struct v4l2_create_buffers *create); 55 int vb2_prepare_buf(struct vb2_queue *q, struct v4l2_buffer *b); 56 57 int vb2_qbuf(struct vb2_queue *q, struct v4l2_buffer *b); 58 int vb2_expbuf(struct vb2_queue *q, struct v4l2_exportbuffer *eb); 59 int vb2_dqbuf(struct vb2_queue *q, struct v4l2_buffer *b, bool nonblocking); 60 61 int vb2_streamon(struct vb2_queue *q, enum v4l2_buf_type type); 62 int vb2_streamoff(struct vb2_queue *q, enum v4l2_buf_type type); 63 64 int __must_check vb2_queue_init(struct vb2_queue *q); 65 void vb2_queue_release(struct vb2_queue *q); 66 unsigned int vb2_poll(struct vb2_queue *q, struct file *file, 67 poll_table *wait); 68 69 /* 70 * The following functions are not part of the vb2 core API, but are simple 71 * helper functions that you can use in your struct v4l2_file_operations, 72 * struct v4l2_ioctl_ops and struct vb2_ops. They will serialize if vb2_queue->lock 73 * or video_device->lock is set, and they will set and test vb2_queue->owner 74 * to check if the calling filehandle is permitted to do the queuing operation. 75 */ 76 77 /* struct v4l2_ioctl_ops helpers */ 78 79 int vb2_ioctl_reqbufs(struct file *file, void *priv, 80 struct v4l2_requestbuffers *p); 81 int vb2_ioctl_create_bufs(struct file *file, void *priv, 82 struct v4l2_create_buffers *p); 83 int vb2_ioctl_prepare_buf(struct file *file, void *priv, 84 struct v4l2_buffer *p); 85 int vb2_ioctl_querybuf(struct file *file, void *priv, struct v4l2_buffer *p); 86 int vb2_ioctl_qbuf(struct file *file, void *priv, struct v4l2_buffer *p); 87 int vb2_ioctl_dqbuf(struct file *file, void *priv, struct v4l2_buffer *p); 88 int vb2_ioctl_streamon(struct file *file, void *priv, enum v4l2_buf_type i); 89 int vb2_ioctl_streamoff(struct file *file, void *priv, enum v4l2_buf_type i); 90 int vb2_ioctl_expbuf(struct file *file, void *priv, 91 struct v4l2_exportbuffer *p); 92 93 /* struct v4l2_file_operations helpers */ 94 95 int vb2_fop_mmap(struct file *file, struct vm_area_struct *vma); 96 int vb2_fop_release(struct file *file); 97 int _vb2_fop_release(struct file *file, struct mutex *lock); 98 ssize_t vb2_fop_write(struct file *file, const char __user *buf, 99 size_t count, loff_t *ppos); 100 ssize_t vb2_fop_read(struct file *file, char __user *buf, 101 size_t count, loff_t *ppos); 102 unsigned int vb2_fop_poll(struct file *file, poll_table *wait); 103 #ifndef CONFIG_MMU 104 unsigned long vb2_fop_get_unmapped_area(struct file *file, unsigned long addr, 105 unsigned long len, unsigned long pgoff, unsigned long flags); 106 #endif 107 108 /* struct vb2_ops helpers, only use if vq->lock is non-NULL. */ 109 110 void vb2_ops_wait_prepare(struct vb2_queue *vq); 111 void vb2_ops_wait_finish(struct vb2_queue *vq); 112 113 #endif /* _MEDIA_VIDEOBUF2_V4L2_H */ 114