2 * videobuf2-v4l2.h - V4L2 driver helper framework
4 * Copyright (C) 2010 Samsung Electronics
6 * Author: Pawel Osciak <pawel@osciak.com>
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.
12 #ifndef _MEDIA_VIDEOBUF2_V4L2_H
13 #define _MEDIA_VIDEOBUF2_V4L2_H
15 #include <linux/videodev2.h>
16 #include <media/videobuf2-core.h>
18 #if VB2_MAX_FRAME != VIDEO_MAX_FRAME
19 #error VB2_MAX_FRAME != VIDEO_MAX_FRAME
22 #if VB2_MAX_PLANES != VIDEO_MAX_PLANES
23 #error VB2_MAX_PLANES != VIDEO_MAX_PLANES
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 * @timestamp: frame timestamp
32 * @timecode: frame timecode
33 * @sequence: sequence count of this frame
34 * @config_store: this buffer should use this configuration store
35 * Should contain enough information to be able to cover all the fields
36 * of struct v4l2_buffer at videodev2.h
38 struct vb2_v4l2_buffer {
39 struct vb2_buffer vb2_buf;
43 struct timeval timestamp;
44 struct v4l2_timecode timecode;
50 * to_vb2_v4l2_buffer() - cast struct vb2_buffer * to struct vb2_v4l2_buffer *
52 #define to_vb2_v4l2_buffer(vb) \
53 container_of(vb, struct vb2_v4l2_buffer, vb2_buf)
55 int vb2_querybuf(struct vb2_queue *q, struct v4l2_buffer *b);
56 int vb2_reqbufs(struct vb2_queue *q, struct v4l2_requestbuffers *req);
58 int vb2_create_bufs(struct vb2_queue *q, struct v4l2_create_buffers *create);
59 int vb2_prepare_buf(struct vb2_queue *q, struct v4l2_buffer *b);
61 int vb2_qbuf(struct vb2_queue *q, struct v4l2_buffer *b);
62 int vb2_expbuf(struct vb2_queue *q, struct v4l2_exportbuffer *eb);
63 int vb2_dqbuf(struct vb2_queue *q, struct v4l2_buffer *b, bool nonblocking);
65 int vb2_streamon(struct vb2_queue *q, enum v4l2_buf_type type);
66 int vb2_streamoff(struct vb2_queue *q, enum v4l2_buf_type type);
68 int __must_check vb2_queue_init(struct vb2_queue *q);
69 void vb2_queue_release(struct vb2_queue *q);
71 unsigned int vb2_poll(struct vb2_queue *q, struct file *file, poll_table *wait);
72 size_t vb2_read(struct vb2_queue *q, char __user *data, size_t count,
73 loff_t *ppos, int nonblock);
74 size_t vb2_write(struct vb2_queue *q, const char __user *data, size_t count,
75 loff_t *ppos, int nonblock);
78 * vb2_thread_fnc - callback function for use with vb2_thread
80 * This is called whenever a buffer is dequeued in the thread.
82 typedef int (*vb2_thread_fnc)(struct vb2_buffer *vb, void *priv);
85 * vb2_thread_start() - start a thread for the given queue.
87 * @fnc: callback function
88 * @priv: priv pointer passed to the callback function
89 * @thread_name:the name of the thread. This will be prefixed with "vb2-".
91 * This starts a thread that will queue and dequeue until an error occurs
92 * or @vb2_thread_stop is called.
94 * This function should not be used for anything else but the videobuf2-dvb
95 * support. If you think you have another good use-case for this, then please
96 * contact the linux-media mailinglist first.
98 int vb2_thread_start(struct vb2_queue *q, vb2_thread_fnc fnc, void *priv,
99 const char *thread_name);
102 * vb2_thread_stop() - stop the thread for the given queue.
105 int vb2_thread_stop(struct vb2_queue *q);
108 * The following functions are not part of the vb2 core API, but are simple
109 * helper functions that you can use in your struct v4l2_file_operations,
110 * struct v4l2_ioctl_ops and struct vb2_ops. They will serialize if vb2_queue->lock
111 * or video_device->lock is set, and they will set and test vb2_queue->owner
112 * to check if the calling filehandle is permitted to do the queuing operation.
115 /* struct v4l2_ioctl_ops helpers */
117 int vb2_ioctl_reqbufs(struct file *file, void *priv,
118 struct v4l2_requestbuffers *p);
119 int vb2_ioctl_create_bufs(struct file *file, void *priv,
120 struct v4l2_create_buffers *p);
121 int vb2_ioctl_prepare_buf(struct file *file, void *priv,
122 struct v4l2_buffer *p);
123 int vb2_ioctl_querybuf(struct file *file, void *priv, struct v4l2_buffer *p);
124 int vb2_ioctl_qbuf(struct file *file, void *priv, struct v4l2_buffer *p);
125 int vb2_ioctl_dqbuf(struct file *file, void *priv, struct v4l2_buffer *p);
126 int vb2_ioctl_streamon(struct file *file, void *priv, enum v4l2_buf_type i);
127 int vb2_ioctl_streamoff(struct file *file, void *priv, enum v4l2_buf_type i);
128 int vb2_ioctl_expbuf(struct file *file, void *priv,
129 struct v4l2_exportbuffer *p);
131 /* struct v4l2_file_operations helpers */
133 int vb2_fop_mmap(struct file *file, struct vm_area_struct *vma);
134 int vb2_fop_release(struct file *file);
135 int _vb2_fop_release(struct file *file, struct mutex *lock);
136 ssize_t vb2_fop_write(struct file *file, const char __user *buf,
137 size_t count, loff_t *ppos);
138 ssize_t vb2_fop_read(struct file *file, char __user *buf,
139 size_t count, loff_t *ppos);
140 unsigned int vb2_fop_poll(struct file *file, poll_table *wait);
142 unsigned long vb2_fop_get_unmapped_area(struct file *file, unsigned long addr,
143 unsigned long len, unsigned long pgoff, unsigned long flags);
146 /* struct vb2_ops helpers, only use if vq->lock is non-NULL. */
148 void vb2_ops_wait_prepare(struct vb2_queue *vq);
149 void vb2_ops_wait_finish(struct vb2_queue *vq);
151 #endif /* _MEDIA_VIDEOBUF2_V4L2_H */