Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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kernel
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linux
1#ifndef _UVC_QUEUE_H_
2#define _UVC_QUEUE_H_
3
4#ifdef __KERNEL__
5
6#include <linux/kernel.h>
7#include <linux/poll.h>
8#include <linux/videodev2.h>
9#include <media/videobuf2-core.h>
10
11/* Maximum frame size in bytes, for sanity checking. */
12#define UVC_MAX_FRAME_SIZE (16*1024*1024)
13/* Maximum number of video buffers. */
14#define UVC_MAX_VIDEO_BUFFERS 32
15
16/* ------------------------------------------------------------------------
17 * Structures.
18 */
19
20enum uvc_buffer_state {
21 UVC_BUF_STATE_IDLE = 0,
22 UVC_BUF_STATE_QUEUED = 1,
23 UVC_BUF_STATE_ACTIVE = 2,
24 UVC_BUF_STATE_DONE = 3,
25 UVC_BUF_STATE_ERROR = 4,
26};
27
28struct uvc_buffer {
29 struct vb2_buffer buf;
30 struct list_head queue;
31
32 enum uvc_buffer_state state;
33 void *mem;
34 unsigned int length;
35 unsigned int bytesused;
36};
37
38#define UVC_QUEUE_DISCONNECTED (1 << 0)
39#define UVC_QUEUE_DROP_INCOMPLETE (1 << 1)
40#define UVC_QUEUE_PAUSED (1 << 2)
41
42struct uvc_video_queue {
43 struct vb2_queue queue;
44 struct mutex mutex; /* Protects queue */
45
46 unsigned int flags;
47 __u32 sequence;
48
49 unsigned int buf_used;
50
51 spinlock_t irqlock; /* Protects flags and irqqueue */
52 struct list_head irqqueue;
53};
54
55static inline int uvc_queue_streaming(struct uvc_video_queue *queue)
56{
57 return vb2_is_streaming(&queue->queue);
58}
59
60#endif /* __KERNEL__ */
61
62#endif /* _UVC_QUEUE_H_ */
63